summaryrefslogtreecommitdiff
path: root/user
diff options
context:
space:
mode:
authorSamuel Thibault <samuel.thibault@ens-lyon.org>2011-04-09 14:34:01 +0200
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2011-04-09 14:34:01 +0200
commitc8b9b7f744338cd7bfc65bf0c5d9066e5296bb03 (patch)
treead71c76c60acec62e278a2063c2ba59b349ba349 /user
parent0aaea62a5f3f9c7ca8f8c80c97004f546f860c84 (diff)
parent6712fac46834ed661d34b3df37e1f6b18b226b8c (diff)
Merge branch 'master' of flubber:~hurd-web/hurd-web
Diffstat (limited to 'user')
-rw-r--r--user/jkoenig/gsoc2011_classes.dia2227
-rw-r--r--user/jkoenig/gsoc2011_classes.pngbin0 -> 59337 bytes
-rw-r--r--user/jkoenig/gsoc2011_proposal.mdwn627
-rw-r--r--user/jkoenig/objcap.mdwn85
4 files changed, 2939 insertions, 0 deletions
diff --git a/user/jkoenig/gsoc2011_classes.dia b/user/jkoenig/gsoc2011_classes.dia
new file mode 100644
index 00000000..1aa3ef6c
--- /dev/null
+++ b/user/jkoenig/gsoc2011_classes.dia
@@ -0,0 +1,2227 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/">
+ <dia:diagramdata>
+ <dia:attribute name="background">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="pagebreak">
+ <dia:color val="#000099"/>
+ </dia:attribute>
+ <dia:attribute name="paper">
+ <dia:composite type="paper">
+ <dia:attribute name="name">
+ <dia:string>#A4#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="tmargin">
+ <dia:real val="2.8222000598907471"/>
+ </dia:attribute>
+ <dia:attribute name="bmargin">
+ <dia:real val="2.8222000598907471"/>
+ </dia:attribute>
+ <dia:attribute name="lmargin">
+ <dia:real val="2.8222000598907471"/>
+ </dia:attribute>
+ <dia:attribute name="rmargin">
+ <dia:real val="2.8222000598907471"/>
+ </dia:attribute>
+ <dia:attribute name="is_portrait">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="scaling">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="fitto">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="grid">
+ <dia:composite type="grid">
+ <dia:attribute name="width_x">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="width_y">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="visible_x">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:attribute name="visible_y">
+ <dia:int val="1"/>
+ </dia:attribute>
+ <dia:composite type="color"/>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="color">
+ <dia:color val="#d8e5e5"/>
+ </dia:attribute>
+ <dia:attribute name="guides">
+ <dia:composite type="guides">
+ <dia:attribute name="hguides"/>
+ <dia:attribute name="vguides"/>
+ </dia:composite>
+ </dia:attribute>
+ </dia:diagramdata>
+ <dia:layer name="Arrière-plan" visible="true" active="true">
+ <dia:group>
+ <dia:object type="UML - LargePackage" version="0" id="O0">
+ <dia:attribute name="obj_pos">
+ <dia:point val="43.3541,9.67669"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="43.3041,8.62669;62.3869,21.8152"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="43.3541,9.67669"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="18.982784066269787"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="12.08849294970096"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000149011612"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#User-defined classes#</dia:string>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Class" version="0" id="O1">
+ <dia:attribute name="obj_pos">
+ <dia:point val="46.0492,12.9799"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="45.9992,12.9299;60.4592,18.4299"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="46.0492,12.9799"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="14.359999999999999"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="5.4000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#HelloIo#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>#Implements a file which always contains "Hello, World!\n"#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_operations">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="visible_comments">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_after_char">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_line_length">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_tagging">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_color">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font">
+ <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font">
+ <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font">
+ <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font">
+ <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font">
+ <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font_height">
+ <dia:real val="0.69999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="attributes"/>
+ <dia:attribute name="operations">
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#write#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#data#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#char[]#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#read#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#char[]#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#amount#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#seek#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#whence#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="template">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="templates"/>
+ </dia:object>
+ </dia:group>
+ <dia:group>
+ <dia:object type="UML - LargePackage" version="0" id="O2">
+ <dia:attribute name="obj_pos">
+ <dia:point val="20.9284,1.19141"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="20.8784,0.141406;41.2223,31.2904"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="20.9284,1.19141"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="20.243864620053902"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="30.049005191839264"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000149011612"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#MIG-generated classes#</dia:string>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Class" version="0" id="O3">
+ <dia:attribute name="obj_pos">
+ <dia:point val="24.8976,5.14749"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="24.8476,5.09749;38.1526,9.79749"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="24.8976,5.14749"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="13.205"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="4.5999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#IoServer#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>#Implements a message handler using a given IO object as a backend#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_operations">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="visible_comments">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_after_char">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_line_length">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_tagging">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_color">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font">
+ <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font">
+ <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font">
+ <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font">
+ <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font">
+ <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font_height">
+ <dia:real val="0.69999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="attributes"/>
+ <dia:attribute name="operations">
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#IoServer#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#back#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Io#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#handle#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="template">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="templates"/>
+ </dia:object>
+ <dia:object type="UML - Class" version="0" id="O4">
+ <dia:attribute name="obj_pos">
+ <dia:point val="24.2494,13.3231"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="24.1994,13.2731;38.6594,18.1731"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="24.2494,13.3231"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="14.359999999999999"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="4.8000000000000007"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#Io#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>#interface#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_operations">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="visible_comments">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_after_char">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_line_length">
+ <dia:int val="17"/>
+ </dia:attribute>
+ <dia:attribute name="comment_tagging">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_color">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font">
+ <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font">
+ <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font">
+ <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font">
+ <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font">
+ <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font_height">
+ <dia:real val="0.69999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="attributes"/>
+ <dia:attribute name="operations">
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#write#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#data#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#char[]#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#read#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#char[]#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#amount#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#seek#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#whence#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="template">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="templates"/>
+ </dia:object>
+ <dia:object type="UML - Class" version="0" id="O5">
+ <dia:attribute name="obj_pos">
+ <dia:point val="24.2494,21.6986"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="24.1994,21.6486;38.6594,27.9486"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="24.2494,21.6986"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="14.359999999999999"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="6.2000000000000002"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#IoUser#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>#Implements the Io interface by performing RPC#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_operations">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="visible_comments">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_after_char">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_line_length">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_tagging">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_color">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font">
+ <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font">
+ <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font">
+ <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font">
+ <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font">
+ <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font_height">
+ <dia:real val="0.69999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="attributes"/>
+ <dia:attribute name="operations">
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#IoUser#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#port#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#MachPort#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#write#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#data#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#char[]#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#read#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#char[]#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#amount#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#seek#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#offset#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#whence#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#int#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="template">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="templates"/>
+ </dia:object>
+ <dia:object type="UML - Realizes" version="1" id="O6">
+ <dia:attribute name="obj_pos">
+ <dia:point val="31.4294,18.1734"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="31.3794,18.1734;31.5294,21.719"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="31.4294,18.1734"/>
+ <dia:point val="31.4294,18.1734"/>
+ <dia:point val="31.4294,21.6482"/>
+ <dia:point val="31.4294,21.6482"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O4" connection="14"/>
+ <dia:connection handle="1" to="O5" connection="16"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Association" version="2" id="O7">
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="direction">
+ <dia:enum val="1"/>
+ </dia:attribute>
+ <dia:attribute name="show_direction">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="assoc_type">
+ <dia:enum val="1"/>
+ </dia:attribute>
+ <dia:attribute name="role_a">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="multipicity_a">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility_a">
+ <dia:enum val="3"/>
+ </dia:attribute>
+ <dia:attribute name="show_arrow_a">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="role_b">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="multipicity_b">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility_b">
+ <dia:enum val="3"/>
+ </dia:attribute>
+ <dia:attribute name="show_arrow_b">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="obj_pos">
+ <dia:point val="24.8976,8.44749"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="22.3132,7.69749;25.6476,16.0231"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="24.8976,8.44749"/>
+ <dia:point val="22.3632,8.44749"/>
+ <dia:point val="22.3632,14.4231"/>
+ <dia:point val="24.2494,14.4231"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O3" connection="8"/>
+ <dia:connection handle="1" to="O4" connection="3"/>
+ </dia:connections>
+ <dia:childnode parent="O2"/>
+ </dia:object>
+ </dia:group>
+ <dia:group>
+ <dia:object type="UML - Realizes" version="1" id="O8">
+ <dia:attribute name="obj_pos">
+ <dia:point val="10.6153,8.74801"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="10.5653,8.74801;10.7153,12.32"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="10.6153,8.74801"/>
+ <dia:point val="10.6153,8.74801"/>
+ <dia:point val="10.6153,12.2493"/>
+ <dia:point val="10.6153,12.2493"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O10" connection="10"/>
+ <dia:connection handle="1" to="O11" connection="12"/>
+ </dia:connections>
+ <dia:childnode parent="O9"/>
+ </dia:object>
+ <dia:object type="UML - LargePackage" version="0" id="O9">
+ <dia:attribute name="obj_pos">
+ <dia:point val="0.503207,3.45415"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="0.453207,2.40415;18.7966,24.081"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="0.503207,3.45415"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="18.243354954612922"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="20.576807332528524"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000149011612"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#libports-like library#</dia:string>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Class" version="0" id="O10">
+ <dia:attribute name="obj_pos">
+ <dia:point val="4.78285,5.49761"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="4.73285,5.44761;16.4978,8.74761"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="4.78285,5.49761"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="11.664999999999999"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="3.2000000000000002"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#Server#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>#interface#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_operations">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="visible_comments">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_after_char">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_line_length">
+ <dia:int val="17"/>
+ </dia:attribute>
+ <dia:attribute name="comment_tagging">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_color">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font">
+ <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font">
+ <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font">
+ <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font">
+ <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font">
+ <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font_height">
+ <dia:real val="0.69999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="attributes"/>
+ <dia:attribute name="operations">
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#handle#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#msg#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="template">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="templates"/>
+ </dia:object>
+ <dia:object type="UML - Class" version="0" id="O11">
+ <dia:attribute name="obj_pos">
+ <dia:point val="4.78285,12.2997"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="4.73285,12.2497;16.4978,15.5497"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="4.78285,12.2997"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="11.664999999999999"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="3.2000000000000002"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#Demux#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="suppress_operations">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_attributes">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="visible_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="visible_comments">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_operations">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="wrap_after_char">
+ <dia:int val="40"/>
+ </dia:attribute>
+ <dia:attribute name="comment_line_length">
+ <dia:int val="17"/>
+ </dia:attribute>
+ <dia:attribute name="comment_tagging">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_color">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text_color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font">
+ <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font">
+ <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font">
+ <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font">
+ <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font">
+ <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+ </dia:attribute>
+ <dia:attribute name="normal_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="polymorphic_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_font_height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="abstract_classname_font_height">
+ <dia:real val="1"/>
+ </dia:attribute>
+ <dia:attribute name="comment_font_height">
+ <dia:real val="0.69999999999999996"/>
+ </dia:attribute>
+ <dia:attribute name="attributes"/>
+ <dia:attribute name="operations">
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#addServer#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#s#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Server#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ <dia:composite type="umloperation">
+ <dia:attribute name="name">
+ <dia:string>#handle#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="abstract">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="inheritance_type">
+ <dia:enum val="2"/>
+ </dia:attribute>
+ <dia:attribute name="query">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="class_scope">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="parameters">
+ <dia:composite type="umlparameter">
+ <dia:attribute name="name">
+ <dia:string>#msg#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="type">
+ <dia:string>#Message#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="value">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="comment">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="kind">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:attribute name="template">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="templates"/>
+ <dia:childnode parent="O9"/>
+ </dia:object>
+ <dia:object type="UML - Association" version="2" id="O12">
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="direction">
+ <dia:enum val="1"/>
+ </dia:attribute>
+ <dia:attribute name="show_direction">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="assoc_type">
+ <dia:enum val="1"/>
+ </dia:attribute>
+ <dia:attribute name="role_a">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="multipicity_a">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility_a">
+ <dia:enum val="3"/>
+ </dia:attribute>
+ <dia:attribute name="show_arrow_a">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="role_b">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="multipicity_b">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="visibility_b">
+ <dia:enum val="3"/>
+ </dia:attribute>
+ <dia:attribute name="show_arrow_b">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="obj_pos">
+ <dia:point val="4.78285,12.9997"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="2.75192,6.54761;5.53285,14.5997"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="4.78285,12.9997"/>
+ <dia:point val="2.80192,12.9997"/>
+ <dia:point val="2.80192,6.59761"/>
+ <dia:point val="4.78285,6.59761"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O11" connection="3"/>
+ <dia:connection handle="1" to="O10" connection="3"/>
+ </dia:connections>
+ <dia:childnode parent="O9"/>
+ </dia:object>
+ <dia:object type="UML - Note" version="0" id="O13">
+ <dia:attribute name="obj_pos">
+ <dia:point val="5.16035,19.1017"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="5.11035,19.0517;16.1203,22.4517"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="5.16035,19.1017"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="10.91"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="3.3000000000000003"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>#Plus some kind of port set
+support and a way to start
+a server thread.#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="pos">
+ <dia:point val="5.51035,20.3467"/>
+ </dia:attribute>
+ <dia:attribute name="color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="alignment">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ <dia:childnode parent="O9"/>
+ </dia:object>
+ <dia:object type="UML - Realizes" version="1" id="O14">
+ <dia:attribute name="obj_pos">
+ <dia:point val="10.6153,8.74801"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="10.5653,8.74801;10.7153,12.32"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="10.6153,8.74801"/>
+ <dia:point val="10.6153,8.74801"/>
+ <dia:point val="10.6153,12.2493"/>
+ <dia:point val="10.6153,12.2493"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O10" connection="10"/>
+ <dia:connection handle="1" to="O11" connection="12"/>
+ </dia:connections>
+ <dia:childnode parent="O9"/>
+ </dia:object>
+ </dia:group>
+ <dia:object type="UML - Note" version="0" id="O15">
+ <dia:attribute name="obj_pos">
+ <dia:point val="29.2528,-4.64872"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="29.2028,-4.69872;32.8978,-2.89872"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="29.2528,-4.64872"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="3.5949999999999998"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="1.7"/>
+ </dia:attribute>
+ <dia:attribute name="line_width">
+ <dia:real val="0.10000000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="fill_colour">
+ <dia:color val="#ffffff"/>
+ </dia:attribute>
+ <dia:attribute name="text">
+ <dia:composite type="text">
+ <dia:attribute name="string">
+ <dia:string>#io.defs#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="font">
+ <dia:font family="monospace" style="0" name="Courier"/>
+ </dia:attribute>
+ <dia:attribute name="height">
+ <dia:real val="0.80000000000000004"/>
+ </dia:attribute>
+ <dia:attribute name="pos">
+ <dia:point val="29.6028,-3.40372"/>
+ </dia:attribute>
+ <dia:attribute name="color">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="alignment">
+ <dia:enum val="0"/>
+ </dia:attribute>
+ </dia:composite>
+ </dia:attribute>
+ </dia:object>
+ <dia:object type="UML - Dependency" version="1" id="O16">
+ <dia:attribute name="obj_pos">
+ <dia:point val="31.0503,-2.94872"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="31.0003,-2.94872;32.3053,1.26212"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="31.0503,-2.94872"/>
+ <dia:point val="31.0503,-2.94872"/>
+ <dia:point val="31.0503,1.19141"/>
+ <dia:point val="31.0503,1.19141"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>#mig#</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="draw_arrow">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O15" connection="6"/>
+ <dia:connection handle="1" to="O2" connection="1"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Realizes" version="1" id="O17">
+ <dia:attribute name="obj_pos">
+ <dia:point val="38.6094,14.4231"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="38.5594,13.5731;46.0992,16.0015"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="38.6094,14.4231"/>
+ <dia:point val="42.3293,14.4231"/>
+ <dia:point val="42.3293,14.3799"/>
+ <dia:point val="46.0492,14.3799"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="true"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O4" connection="4"/>
+ <dia:connection handle="1" to="O1" connection="3"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Realizes" version="1" id="O18">
+ <dia:attribute name="obj_pos">
+ <dia:point val="16.4478,6.59761"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="16.3978,5.74761;24.9476,8.17255"/>
+ </dia:attribute>
+ <dia:attribute name="meta">
+ <dia:composite type="dict"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="16.4478,6.59761"/>
+ <dia:point val="20.4657,6.59761"/>
+ <dia:point val="20.4657,6.54749"/>
+ <dia:point val="24.8976,6.54749"/>
+ </dia:attribute>
+ <dia:attribute name="orth_orient">
+ <dia:enum val="0"/>
+ <dia:enum val="1"/>
+ <dia:enum val="0"/>
+ </dia:attribute>
+ <dia:attribute name="orth_autoroute">
+ <dia:boolean val="false"/>
+ </dia:attribute>
+ <dia:attribute name="line_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="text_colour">
+ <dia:color val="#000000"/>
+ </dia:attribute>
+ <dia:attribute name="name">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:attribute name="stereotype">
+ <dia:string>##</dia:string>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O10" connection="4"/>
+ <dia:connection handle="1" to="O3" connection="3"/>
+ </dia:connections>
+ </dia:object>
+ </dia:layer>
+</dia:diagram>
diff --git a/user/jkoenig/gsoc2011_classes.png b/user/jkoenig/gsoc2011_classes.png
new file mode 100644
index 00000000..7149b813
--- /dev/null
+++ b/user/jkoenig/gsoc2011_classes.png
Binary files differ
diff --git a/user/jkoenig/gsoc2011_proposal.mdwn b/user/jkoenig/gsoc2011_proposal.mdwn
new file mode 100644
index 00000000..eeaa5aaa
--- /dev/null
+++ b/user/jkoenig/gsoc2011_proposal.mdwn
@@ -0,0 +1,627 @@
+
+# Java for Hurd (and vice versa)
+
+Contact information:
+
+ * Full name: Jérémie Koenig
+ * Email: jk@jk.fr.eu.org
+ * IRC: jkoenig on Freenode and OFTC
+
+## Introductions
+
+I am a first year M.Sc. student
+in Computer Science at University of Strasbourg (France).
+My interests include capability-based security,
+programming languages and formal methods
+(in particular, object-capability languages and proof-carrying code).
+
+### Proposal summary
+
+This project would consist in improving Java support on Hurd.
+The first part would consist in
+fixing bugs and porting Java-related packages.
+The second part would consist in
+creating low-level Java bindings for the Hurd interfaces,
+as well as libraries to make translator development easier.
+
+### Previous involvement
+
+I started contributing to Hurd last summer,
+during which I participated to Google Summer of Code
+as a student for the Debian project.
+I worked on porting Debian-Installer to Hurd.
+This project was mostly a success,
+although we still have to use a special mirror for installation
+with a few modified packages
+and tweaked priorities
+to work around some uninstallable packages
+with Priority: standard.
+
+Shortly afterwards,
+I rewrote the procfs translator
+to fix some issues with memory leaks,
+make it more reliable,
+and improve compatibility with Linux-based tools
+such as `procps` or `htop`.
+
+Although I have not had as much time
+as I would have liked to dedicate to the Hurd
+since that time,
+I have continued to maintain the mirror in question,
+and I have started to work
+on implementing POSIX threads signal semantics in glibc.
+
+### Project-related skills and interests
+
+I have used Java mostly for university assignments.
+This includes non-trivial projects
+using threads and distributed programming frameworks
+such as Java RMI or CORBA.
+I have also used it to experiment with
+Google App Engine
+(web applications)
+and Google Web Toolkit
+(a compiler from Java to Javascript which helps with AJAX code),
+and I have some limited experience with JNI
+(the Java Native Interface, to link Java with C code).
+
+My knowledge of the Hurd and Debian GNU/Hurd is reasonable,
+as the Debian-Installer and procfs projects
+gave me the opportunity to fiddle with many parts of the system.
+
+Initially,
+I started working on this project because I wanted to use
+[Joe-E](http://code.google.com/p/joe-e/)
+(a subset of Java)
+to investigate the potential
+[[applications of object-capability languages|objcap]]
+in a Hurd context.
+I also believe that improving Java support on Hurd
+would be an important milestone.
+
+### Organisational matters
+
+I am subscribed to bug-hurd@g.o and
+I do have a permanent internet connexion.
+
+I would be able to attend the regular IRC meetings,
+and otherwise communicate with my mentor
+through any means they would prefer
+(though I expect email and IRC would be the most practical).
+Since I'm already familiar with the Hurd,
+I don't expect I would require too much time from them.
+
+My exams end on May 20 so I would be able to start coding
+right at the beginning of the GSoC period.
+Next year's term would probably begin around September 15,
+so that would not be an issue either.
+I expect I would work around 40 hours per week,
+and my waking hours would be flexible.
+
+I don't have any other plans for the summer
+and would not make any if my project were to be accepted.
+
+Full disclosure:
+I also submitted a proposal to the Jikes RVM project
+(which is a research-oriented Java Virtual Machine,
+itself written in Java)
+for implementing a new garbage collector into the MMTk subsystem.
+
+## Improve Java support
+
+### Justification
+
+Java is a popular language and platform used by many desktop and web
+applications (mostly on the server side). As a consequence, competitive Java
+support is important for any general-purpose operating system.
+Better Java support would also be a prerequisite
+for the second part of my proposal.
+
+### Current situation
+
+Java is currently supported on Hurd with the GNU Java suite:
+
+ * [GCJ](http://gcc.gnu.org/java/),
+ the GNU Compiler for Java, is part of GCC and can compile Java
+ source code to Java bytecode, and both source code and bytecode to
+ native code;
+ * libgcj is the implementation of the Java runtime which GCJ uses.
+ It is based on [GNU Classpath](http://www.gnu.org/software/classpath/).
+ It includes a bytecode interpreter which enables
+ Java applications compiled to native code to dynamically load and execute
+ Java bytecode from class files.
+ * The gij command is a wrapper around the above-mentioned virtual machine
+ functionality of libgcj and can be used as a replacement for the java
+ command.
+
+However, GCJ does not work flawlessly on Hurd.r
+For instance, some parts of libgcj relies on
+the POSIX threads signal semantics, which are not yet implemented.
+In particular, this makes ant hang waiting for child processes,
+which makes some packages fail to build on Hurd
+(“ant” is the “make” of the Java world).
+
+### Tasks
+
+ * **Finish implementing POSIX thread semantics** in glibc (high priority).
+ According to POSIX, signal dispositions should be global to a process,
+ while signal blocking masks should be thread-specific. Signals sent to the
+ process as a whole are to be delivered to any thread which does not block
+ them. By contrast, Hurd has per-thread signal dispositions and signals
+ sent to a process are delivered to the main thread only. I have been
+ working on refactoring the glibc signal code and implementing the POSIX
+ semantics as a per-thread option. However, due to lack of time I have not
+ yet been able to test and debug my code properly. Finishing this work
+ would be my first task.
+ * **Fix further problems with GCJ on Hurd** (high priority). While I’m not
+ aware of any other problems with GCJ at the moment, I suspect some might
+ turn up as I progress with the other tasks. Fixing these problems would
+ also be a high-priority task.
+ * **Port OpenJDK 6** (medium priority). While GCJ is fine, it is not yet
+ 100% complete. It is also slower than OpenJDK on architectures where a
+ just-in-time compiler is available. Porting OpenJDK would therefore
+ improve Java support on Hurd in scope and quality. Besides, it would also
+ be a good way to test GCJ, which is used for bootstrapping by the Debian
+ OpenJDK packages. Also note that OpenJDK 6 is now the default Java
+ Runtime Environment on all released Linux-based Debian architectures;
+ bringing Hurd in line with this would probably be a good thing.
+ * **Port Eclipse and other Java applications** (low priority). Eclipse is a
+ popular, state-of-the-art IDE and tool suite used for Java and other
+ languages. It is a dependency of the Joe-E verifier (see part 3 of this
+ proposal). Porting Eclipse would be a good opportunity to test GCJ and
+ OpenJDK.
+
+### Deliverables
+
+ * The glibc pthreads patch and any other fixes on the Hurd side
+ would be submitted upstream
+ * Patches against Debian source packages
+ required to make them build on Hurd would be submitted
+ to the [Debian bug tracking system](http://bugs.debian.org/).
+
+
+## Create Java bindings for the Hurd interfaces
+
+### Justification
+
+Java is used for many applications and often taught to
+introduce object-oriented programming. The fact that Java is a
+garbage-collected language makes it easier to use, especially for the less
+experienced programmers. Besides, its object-oriented nature is a
+natural fit for the capability-based design of Hurd.
+The JVM is also used as a target for many other languages,
+all of which would benefit from the access provided by these bindings.
+
+Advantages over other garbage-collected, object-oriented languages include
+performance, type safety and the possibility to compile a Java translator to
+native code and
+[link it statically](http://gcc.gnu.org/wiki/Statically_linking_libgcj)
+using GCJ, should anyone want to use a
+translator written in Java for booting.
+Note that Java is
+[being](http://www.linuxjournal.com/article/8757)
+[used](http://oss.readytalk.com/avian/)
+in this manner for embedded development.
+Since GCJ can take bytecode as its input,
+this expect this possibility would apply to any JVM-based language.
+
+Java bindings would lower the bar for newcomers
+to begin experimenting with what makes Hurd unique
+without being faced right away with the complexity of
+low-level systems programming.
+
+### Tasks summary
+
+ * Implement Java bindings for Mach
+ * Implement a libports-like library for Java
+ * Modify MIG to output Java code
+ * Implement libfoofs-like Java libraries
+
+### Design principles
+
+The principles I would use to guide the design
+of these Java bindings would be the following ones:
+ * The system should be hooked into at a low level,
+ to ensure that Java is a "first class citizen"
+ as far as the access to the Hurd's interfaces is concerned.
+ * At the same time, the memory safety of Java should be maintained
+ and extended to Mach primitives such as port names and
+ out-of-line memory regions.
+ * Higher-level interfaces should be provided as well
+ in order to make translator development
+ as easy as possible.
+ * A minimum amount of JNI code (ie. C code) should be used.
+ Most of the system should be built using Java itself
+ on top of a few low-level primitives.
+ * Hurd objects would map to Java objects.
+ * Using the same interfaces,
+ objects corresponding to local ports would be accessed directly,
+ and remote objects would be accessed over IPC.
+
+One approach used previously to interface programming languages with the Hurd
+has been to create bindings for helper libraries such as libtrivfs. Instead,
+for Java I would like to take a lower-level approach by providing access to
+Mach primitives and extending MIG to generate Java code from the interface
+description files.
+
+This approach would be initially more involved, and would introduces several
+issues related to overcoming the "impedance mismatch" between Java and Mach.
+However, once an initial implementation is done it would be easier to maintain
+in the long run and we would be able to provide Java bindings for a large
+percentage of the Hurd’s interfaces.
+
+### Bindings for Mach system calls
+
+In this low-level approach, my intention is to enable Java code to use Mach
+system calls (in particular, mach_msg) more or less directly. This would
+ensure full access to the system from Java code, but it raises a number of
+issues:
+
+ * the Java code must be able to manipulate Mach-level entities, such as port
+ rights or page-aligned buffers mapped outside of the garbage-collected
+ heap (for out-of-line transfers);
+ * putting together IPC messages requires control of the low-level
+ representation of data.
+
+In order to address these concerns, classes would be encapsulating these
+low-level entities so that they can be referenced through normal, safe objects
+from standard Java code. Bindings for Mach system calls can then be provided
+in terms of these classes. Their implementation would use C code through the
+Java Native Interface (JNI).
+
+More specifically, this functionality would be provided by the `org.gnu.mach`
+package, which would contain at least the following classes:
+
+ * `MachPort` would encapsulate a `mach_port_t`. (Some of) its constructors
+ would act as an interface for the `mach_port_allocate()` system call.
+ `MachPort` objects would also be instantiated from other parts of the JNI
+ C code to represent port rights received through IPC. The `deallocate()`
+ method would call `mach_port_deallocate()` and replace the encapsulated
+ port name with `MACH_PORT_DEAD`. We would recommend that users call it
+ when a port is no longer used, but the finalizer would also deallocate the
+ port when the `MachPort` object is garbage collected.
+ * `Buffer` would represent a page-aligned buffer allocated outside of the
+ Java heap, to be transferred (or having been received) as out-of-line
+ memory. The JNI code would would provide methods to read and write data at
+ an arbitrary offset (but within bounds) and would use `vm_allocate()` and
+ `vm_deallocate()` in the same spirit as for `MachPort` objects.
+ * `Message` would allow Java code to put together Mach messages. The
+ constructor would allocate a `byte[]` member array of a given size.
+ Additional methods would be provided to fill in or query the information
+ in the message header and additional data items, including `MachPort` and
+ `Buffer` objects which would be translated to the corresponding port names
+ and out-of-line pointers.
+ A global map from port names to the corresponding `MachPort` object
+ would probably be needed to ensure that there is a one-to-one
+ correspondence.
+ * `Syscall` would provide static JNI methods for performing system calls not
+ covered by the above classes, such as `mach_msg()` or
+ `mach_thread_self()`. These methods would accept or return `MachPort`,
+ `Buffer` and `Message` objects when appropriate. The associated C code
+ would access the contents of such objects directly in order to perform the
+ required unsafe operations, such as constructing `MachPort` and `Buffer`
+ objects directly from port names and C pointers.
+
+Note that careful consideration should be given to the interfaces of these
+classes to avoid “safety leaks” which would compromise the safety guarantees
+provided by Java. Potential problematic scenarios include the following
+examples:
+
+ * It must not be possible to write an integer at some position in a
+ `Message` object, and to read it back as a `MachPort` or `Buffer` object,
+ since this would allow unsafe access to arbitrary memory addresses and
+ mach port names.
+ * Providing the `mach_task_self()` system call would also provide access to
+ arbitrary addresses and ports by using the `vm_*` family of RPC operations
+ with the returned `MachPort` object. This means that the relevant task
+ operations should be provided by the `Syscall` class instead.
+
+Finally, access should be provided to the initial ports and file descriptors
+in `_hurd_ports` and provided by the `getdport()` function,
+for instance through static methods such as
+`getCRDir()`, `getCWDir()`, `getProc()`, ... in a dedicated class such as
+`org.gnu.hurd.InitPorts`.
+
+A realistic example of code based on such interfaces would be:
+
+ import org.gnu.mach.MsgType;
+ import org.gnu.mach.MachPort;
+ import org.gnu.mach.Buffer;
+ import org.gnu.mach.Message;
+ import org.gnu.mach.Syscall;
+ import org.gnu.hurd.InitPorts;
+
+ public class Hello
+ {
+ public static main(String argv[])
+ /* Parent class for all Mach-related exceptions */
+ throws org.gnu.mach.MachException
+ {
+ /* Allocate a reply port */
+ MachPort reply = new MachPort();
+
+ /* Allocate an out-of-line buffer */
+ Buffer data = new Buffer(MsgType.CHAR, 13);
+ data.writeString(0, "Hello, World!");
+
+ /* Craft an io_write message */
+ Message msg = new Message(1024);
+ msg.setRemotePort(InitPorts.getdport(1));
+ msg.setLocalPort(reply, Message.Type.MAKE_SEND_ONCE);
+ msg.setId(21000);
+ msg.addBuffer(data);
+
+ /* Make the call, MACH_MSG_SEND | MACH_MSG_RECEIVE */
+ Syscall.machMsg(msg, true, true, reply);
+
+ /* Extract the returned value */
+ msg.assertId(21100);
+ int retCode = msg.readInt(0);
+ int amount = msg.readInt(1);
+ }
+ }
+
+Should this paradigm prove insufficient,
+more ideas could be borrowed from the
+[`org.vmmagic`](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.151.5253&rep=rep1&type=pdf)
+package used by [Jikes RVM](http://jikesrvm.org/),
+a research Java virtual machine itself written in Java.
+
+### Generating Java stubs with MIG
+
+Once the basic machinery is in place to interface with Mach, Java programs
+have more or less equal access to the system functionality without resorting
+to more JNI code. However, as illustrated above, this access is far from
+convenient.
+
+As a solution I would modify MIG to add the option to output Java code. MIG
+would emit a Java interface, a client class able to implement the interface
+given a Mach port send right, an a server class which would be able to handle
+incoming messages. The class diagram below, although it is by no means
+complete or exempt of any problem, illustrates the general idea:
+
+[[gsoc2011_classes.png]]
+
+This structure is somewhat reminiscent of
+[Java RMI](http://en.wikipedia.org/wiki/Java_remote_method_invocation)
+or similar systems,
+which aim to provide more or less transparent access to remote objects.
+The exact way the Java code would be generated still needs to be determined,
+but basically:
+
+ * An interface, corresponding to the header files generated by MIG, would
+ enumerate the operations listed in a given .defs files. Method names would
+ be transformed to adhere to Java conventions (for instance,
+ `some_random_identifier` would become `someRandomIdentifier`).
+ * A user class, corresponding to the `*User.c` files,
+ would implement this interface by doing RPC over a given MachPort object.
+ * A server class, corresponding to `*Server.c`, would be able to handle
+ incoming messages using a user-provided implementation of the interface.
+ (Possibly, a skeleton class providing methods which would raise
+ `NotImplementedException`s would be provided as well.
+ Users would derive from this class and override the relevant methods.
+ This would allow them not to implement some operations,
+ and would avoid pre-existing code from breaking when new operations are
+ introduced.)
+
+In order to help with the implementation of servers, some kind of library
+would be needed to associate Mach receive rights with server objects and to
+handle incoming messages on dedicated threads, in the spirit of libports.
+This would probably require support for port sets at the level of the Mach
+primitives described in the previous section.
+
+When possible, operations involving the transmission of send rights
+of some kind would be expressed in terms of the MIG-generated interfaces
+instead of `MachPort` objects.
+Upon reception of a send right,
+a `FooUser` object would be created
+and associated with the corresponding `MachPort` object.
+If the received send right corresponds to a local port
+to which a server object has been associated,
+this object would be used instead.
+This way,
+subsequent operations on the received send right
+would be handled as direct method calls
+instead of going through RPC mechanisms.
+
+Some issues will still need to be solved regarding how MIG will convert
+interface description files to Java interfaces. For instance:
+
+ * `.defs` files are not explicitly associated with a type. For instance in
+ the example above, MIG would have to somehow infer that io_t corresponds
+ to `this` in the `Io` interface.
+ * More generally, a correspondence between MIG and Java types would have
+ to be determined. Ideally this would be automated and not hardcoded
+ too much.
+ * Initially, reply port parameters would be ignored. However they may be
+ needed for some applications.
+
+So the details would need to be flushed out during the community bonding
+period and as the implementation progresses. However I’m confident that a
+satisfactory solution can be designed.
+
+Using these new features, the example above could be rewritten as:
+
+ import org.gnu.hurd.InitPorts;
+ import org.gnu.hurd.Io;
+ import org.gnu.hurd.IoUser;
+
+ class Hello {
+ static void main(String argv[]) throws ...
+ {
+ Io stdout = new IoUser(InitPorts.getdport(1));
+ String hello = “Hello, World!\n”;
+
+ int amount = stdout.write(hello.getBytes(), -1);
+
+ /* (A retCode corresponding to an error
+ would be signalled as an exception.) */
+ }
+ }
+
+An example of server implementation would be:
+
+ import org.gnu.hurd.Io;
+ import java.util.Arrays;
+
+ class HelloIo implements Io {
+ final byte[] contents = “Hello, World!\n”.getBytes();
+
+ int write(byte[] data, int offset) {
+ return SOME_ERROR_CODE;
+ }
+
+ byte[] read(int offset, int amount) {
+ return Arrays.copyOfRange(contents, offset,
+ offset + amount - 1);
+ }
+
+ /* ... */
+ }
+
+A new server object could then be created with `new IoServer(new HelloIo())`,
+and associated with some receive right at the level of the ports management
+library.
+
+### Base classes for common types of translators
+
+Once MIG can target Java code, and a libports equivalent is available,
+creating new translators in Java would be greatly facilitated. However,
+we would probably want to introduce basic implementations of file system
+translators in the spirit of libtrivfs or libnetfs. They could take the form
+of base classes implementing the relevant MIG-generated interfaces which
+would then be derived by users,
+or could define a simpler interface
+which would then be used by adapter classes
+to implement the required ones.
+
+I would draw inspiration from libtrivfs and libnetfs
+to design and implement similar solutions for Java.
+
+### Deliverables
+
+ * A hurd-java package would contain the Java code developed
+ in the context of this project.
+ * The Java code would be documented using javadoc
+ and a tutorial for writing translators would be written as well.
+ * Modifications to MIG would be submitted upstream,
+ or a patched MIG package would be made available.
+
+The Java libraries resulting from this work,
+including any MIG support classes
+as well as the class files built from the MIG-generated code
+for the Mach and Hurd interface definition files,
+would be provided as single `hurd-java` package for
+Debian GNU/Hurd.
+This package would be separate from both Hurd and Mach,
+so as not to impose unreasonable build dependencies on them.
+
+I expect I would be able to act as its maintainer in the foreseeable future,
+either as an individual or as a part of the Hurd team.
+Hopefully,
+my code would be claimed by the Hurd project as their own,
+and consequently the modifications to MIG
+(which would at least conceptually depend on the Mach Java package)
+could be integrated upstream.
+
+Since by design,
+the Java code would use only a small number of stable interfaces,
+it would not be subject to excessive amounts of bitrot.
+Consequently,
+maintenance would primarily consist in
+fixing bugs as they are reported,
+and adding new features as they are requested.
+A large number of such requests
+would mean the package is useful,
+so I expect that the overall amount of work
+would be correlated with the willingness of more people
+to help with maintenance
+should I become overwhelmed or get hit by a bus.
+
+
+## Timeline
+
+The dates listed are deadlines for the associated tasks.
+
+ * *Community bonding period.*
+ Discuss, refine and complete the design of the Java bindings
+ (in particular the MIG and "libports" parts)
+ * *May 23.*
+ Coding starts.
+ * *May 30.*
+ Finish implementing pthread signal semantics.
+ * *June 5.*
+ Port OpenJDK
+ * *June 12.*
+ Fix the remaining problems with GCJ and/or OpenJDK,
+ possibly port Eclipse or other big Java packages.
+ * *June 19.*
+ Create the bindings for Mach.
+ * *June 26.*
+ Work on some kind of basic Java libports
+ to handle receive rights.
+ * *July 3.*
+ Test, write some documentation and examples.
+ * *July 17 (two weeks).*
+ Add the Java target to MIG.
+ * *July 24.*
+ Test, write some documentation and examples.
+ * *August 7 (two weeks).*
+ Implement a modular libfoofs to help with translator development.
+ Try to write a basic but non-trivial translator
+ to evaluate the performance and ease of use of the result,
+ rectify any rough edges this would uncover.
+ * *August 22. (last two weeks)*
+ Polish the code and packaging,
+ finish writing the documentation.
+
+
+## Conclusion
+
+This project is arguably ambitious.
+However, I have been thinking about it for some time now
+and I'm confident I would be able to accomplish most of it.
+
+In the event multiple language bindings projects
+would be accepted,
+some work could probably be done in common.
+In particular,
+[ArneBab](http://www.bddebian.com/~hurd-web/community/weblogs/ArneBab/2011-04-06-application-pyhurd/)
+seems to favor a low-level approach for his Python bindings as I do for Java,
+and I would be happy to discuss API design and coordinate MIG changes with him.
+I would also have an extra month after the end of the GSoC period
+before I go back to school,
+which I would be able to use to finish the project
+if there is some remaining work.
+(Last year's rewrite of procfs was done during this period.)
+
+As for the project's benefits,
+I believe that good support for Java
+is a must-have for the Hurd.
+Java bindings would also further the Hurd's agenda
+of user freedom by extending this freedom to more people:
+I expect the set of developers
+who would be able to write Java code against a well-written libfoofs
+is much larger than
+those who master the intricacies of low-level systems C programming.
+From a more strategic point of view,
+this would also help recruit new contributors
+by providing an easier path to learning the inner workings of the Hurd.
+
+Further developments
+which would build on the results of this project
+include my planned [[experiment with Joe-E|objcap]]
+(which I would possibly take on as a university project next year).
+Another possibility would be to reimplement some parts
+of the Java standard library
+directly in terms of the Hurd interfaces
+instead of using the POSIX ones through glibc.
+This would possibly improve the performance
+of some Java applications (though probably not by much),
+and would otherwise be a good project
+for someone trying to get acquainted with Hurd.
+
+Overall, I believe this project would be fun, interesting and useful.
+I hope that you will share this sentiment
+and give me the opportunity to spend another summer working on Hurd.
+
diff --git a/user/jkoenig/objcap.mdwn b/user/jkoenig/objcap.mdwn
new file mode 100644
index 00000000..e4cd20e8
--- /dev/null
+++ b/user/jkoenig/objcap.mdwn
@@ -0,0 +1,85 @@
+
+# Potential applications of object-capability languages
+
+The work discussed is this last part would have
+fewer immediate benefits for the Hurd project
+and has more of a research orientation.
+It is also unlikely that there would be any time remaining
+to work on it at the end of the summer.
+(Though it could work as some kind of reward
+if I somehow managed to do a prefect job of all the rest
+within the allocated time :-) ).
+As a consequence,
+I don't really consider this a part of my application.
+
+This being said,
+to some extent the project discussed here
+will informed the way I design the Java bindings,
+since it depends on them
+and I intend to work on this at some point in the future.
+I also believe it touches on some interesting ideas,
+and a Summer of Code application is probably
+as good an occasion as any to discuss them.
+
+### Justification
+
+The primary advantage of multi-server operating systems is the ability to
+break what used to be the kernel into small pieces which can be isolated
+from each others. This makes sense from an engineering perspective, as
+smaller components can be swapped with different implementations and reduce
+the impact of bugs.
+A capability-based approach also ensures that the
+authority wielded by components is clear and reduced to the minimum required
+for them to function.
+These properties are crucial to the Hurd's agenda of user freedom,
+since in order to allow them to plug their own code into the system
+[FIXME: développer]
+
+However, this flexibility has a cost. In a system where the isolation of
+components relies on running them inside different address spaces,
+communication between them must be done through IPC calls.
+This introduces a trade-off between the size of the modules
+and performance as well as practicality,
+which imposes a limit to the granularity with which the system
+can be decomposed and the principle of least authority applied
+(to the code within a given process, a Mach port is ambient authority).
+
+Another issue is that of the threading structure of the system as a whole.
+In systems based on a monolithic kernel, user threads execute the kernel
+code themselves, which is then intrinsically concurrent. By contrast, in a
+system based on a “client-server” paradigm, each server must be explicitly
+multi-threaded if it is to serve requests concurrently.
+
+### Object-capability languages
+
+An object-capability language is an object-oriented language which is
+restricted enough so that object references are themselves capabilities.
+
+One such language is Joe-E (FIXME: lien),
+which is an object-capability subset of Java:
+global state and static methods are mostly forbidden;
+careful white-listing of the objects and methods
+provided by the Java standard library
+ensures that compliant code cannot not access ambient autority.
+Ways in which object references can be transferred
+are restricted to the most obvious ones
+(for instance, exceptions are carefully restricted).
+
+As a result, untrusted Joe-E code can be executed without any further
+isolation and its autority can be controlled by carefully limiting the
+object references which are passed to it.
+This would allow to load and execute translators written in Joe-E
+in a single address space.
+
+### Bundling translators into a single process
+
+[mechanisme pour transmettre le code Joe-E
+et les port initiaux au serveur]
+[émulation des différentes tâches]
+
+### Challenges and further work
+
+[proof-carrying code / typed assembly,
+resource accounting (passer en revue la conception de Viengoos?)]
+
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 04:19:32 +0000