doc updates to support 1.10 pre3 and the different way we handle event callbacks with InvocationProxy
This commit is contained in:
clay_shooter
@@ -1,4 +1,5 @@
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<html xmlns:o="urn:schemas-microsoft-com:office:office"
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<html xmlns:v="urn:schemas-microsoft-com:vml"
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xmlns:o="urn:schemas-microsoft-com:office:office"
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xmlns:w="urn:schemas-microsoft-com:office:word"
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xmlns="http://www.w3.org/TR/REC-html40">
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@@ -16,8 +17,6 @@ xmlns="http://www.w3.org/TR/REC-html40">
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</xml><![endif]--><!--[if gte mso 9]><xml>
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<w:WordDocument>
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<w:DisplayBackgroundShape/>
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<w:SpellingState>Clean</w:SpellingState>
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<w:GrammarState>Clean</w:GrammarState>
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<w:ValidateAgainstSchemas/>
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<w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid>
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<w:IgnoreMixedContent>false</w:IgnoreMixedContent>
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@@ -50,12 +49,6 @@ p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
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font-size:10.0pt;
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font-family:"Courier New";
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mso-fareast-font-family:"Times New Roman";}
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span.SpellE
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{mso-style-name:"";
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mso-spl-e:yes;}
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span.GramE
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{mso-style-name:"";
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mso-gram-e:yes;}
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@page Section1
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{size:8.5in 11.0in;
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margin:1.0in 65.95pt 1.0in 65.95pt;
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@@ -108,47 +101,64 @@ div.Section1
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1
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{mso-list-id:638341914;
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mso-list-type:hybrid;
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mso-list-template-ids:-1620437462 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
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@list l1:level1
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{mso-level-tab-stop:.75in;
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mso-level-number-position:left;
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margin-left:.75in;
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text-indent:-.25in;}
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@list l2
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{mso-list-id:1316765558;
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mso-list-type:hybrid;
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mso-list-template-ids:860497186 -1920937264 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
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@list l1:level1
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@list l2:level1
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{mso-level-text:"%1\)";
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mso-level-tab-stop:42.0pt;
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mso-level-number-position:left;
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margin-left:42.0pt;
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text-indent:-24.0pt;}
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@list l1:level2
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@list l2:level2
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{mso-level-tab-stop:1.0in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level3
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@list l2:level3
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{mso-level-tab-stop:1.5in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level4
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@list l2:level4
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{mso-level-tab-stop:2.0in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level5
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@list l2:level5
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{mso-level-tab-stop:2.5in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level6
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@list l2:level6
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{mso-level-tab-stop:3.0in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level7
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@list l2:level7
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{mso-level-tab-stop:3.5in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level8
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@list l2:level8
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{mso-level-tab-stop:4.0in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l1:level9
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@list l2:level9
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{mso-level-tab-stop:4.5in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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@list l3
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{mso-list-id:1718122875;
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mso-list-type:hybrid;
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mso-list-template-ids:-1873125376 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
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@list l3:level1
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{mso-level-tab-stop:.5in;
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mso-level-number-position:left;
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text-indent:-.25in;}
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ol
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{margin-bottom:0in;}
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ul
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@@ -174,7 +184,12 @@ ul
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mso-fareast-language:#0400;
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mso-bidi-language:#0400;}
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</style>
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<![endif]-->
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<![endif]--><!--[if gte mso 9]><xml>
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<o:shapedefaults v:ext="edit" spidmax="2050"/>
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</xml><![endif]--><!--[if gte mso 9]><xml>
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<o:shapelayout v:ext="edit">
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<o:idmap v:ext="edit" data="1"/>
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</o:shapelayout></xml><![endif]-->
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</head>
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<body lang=EN-US style='tab-interval:.5in'>
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@@ -188,98 +203,116 @@ is:</p>
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<p class=MsoPlainText><o:p> </o:p></p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>1)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>Application thread creates an instance of the
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event handler and registers it with Jacob</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>2)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The application continues on doing other work.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>3)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>Some time later, the MS application takes some
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action and initiates the event callback.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>4)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The Java VM receives the event and spins up a
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new thread to handle it.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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||||
l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>5)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The Jacob <span class=SpellE>EventProxy</span>
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in the <span class=SpellE>dll</span> is called by the VM.</p>
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</span></span></span><![endif]>The Jacob jni EventProxy in the dll is called by
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the VM.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>6)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The Jacob <span class=SpellE>EventProxy</span>
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creates Variant objects to handle the parameters of the passed in event.</p>
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</span></span></span><![endif]>The Jacob jni EventProxy creates Variant objects
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to handle the parameters of the passed in event.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>7)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The Jacob <span class=SpellE>EventProxy</span>
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uses reflection to map the event name to a method name with the exact same
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name.</p>
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</span></span></span><![endif]>The Jacob jni EventProxy sends the name of the
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callback and the array of Variant objects to the Java<span
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style='mso-spacerun:yes'><EFBFBD> </span>InvocationProxy that was registered to catch
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events.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l1 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>8)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The Jacob <span class=SpellE>EventProxy</span>
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sends the message to the registered event handler.</p>
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</span></span></span><![endif]>The Java InvocationProxy uses reflection to map
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the event name to a method name with the exact same name.</p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>9)<span
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style='font:7.0pt "Times New Roman"'>
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</span></span></span><![endif]>The Java InvocationProxy sends the message to
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the registered event handler and returns if the event handler is of type void
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(standard behavior).<span style='mso-spacerun:yes'><EFBFBD> </span></p>
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<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
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||||
l2 level1 lfo2;tab-stops:list 42.0pt'><![if !supportLists]><span
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||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>10)<span
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||||
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>The
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Java InvocationProxy sends the message to the registered event handler and
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returns the Variant that resulted from the call back to the Jacob jni
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EventProxy that then returns it to the windows calling program.</p>
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||||
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<p class=MsoPlainText><o:p> </o:p></p>
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||||
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||||
<p class=MsoPlainText>Swing developers should note that this message comes in
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on a thread other than the event thread.<span style='mso-spacerun:yes'><EFBFBD>
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||||
</span>All objects receiving events that require user intervention or drawing
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||||
in the UI should use <span class=SpellE><span class=GramE>invokeLater</span></span><span
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||||
class=GramE>(</span>) to post requests for actions onto the event queue.<span
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style='mso-spacerun:yes'><EFBFBD> </span>Failure to do so will insure random failures
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in the GUI.</p>
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||||
in the UI should use invokeLater() to post requests for actions onto the event
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||||
queue.<span style='mso-spacerun:yes'><EFBFBD> </span>Failure to do so will insure random
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failures in the GUI.</p>
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||||
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||||
<p class=MsoPlainText><o:p> </o:p></p>
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||||
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||||
<p class=MsoPlainText><o:p> </o:p></p>
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||||
|
||||
<p class=MsoPlainText>Java Web Start (JWS) and other launchers can have
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||||
additional issues related to the class loader.<span style='mso-spacerun:yes'><EFBFBD>
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||||
</span>The Jacob C++ library uses <span class=SpellE><span class=GramE>FindClass</span></span><span
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||||
class=GramE>(</span>) to find the Variant class when building the parameter
|
||||
list.<span style='mso-spacerun:yes'><EFBFBD> </span><span class=SpellE><span
|
||||
class=GramE>FindClass</span></span><span class=GramE>(</span>) uses the system
|
||||
class loader which includes only the classes specified at run time or in the
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||||
CLASSPATH.<span style='mso-spacerun:yes'><EFBFBD> </span>Most of the application
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classes in this situation live in an alternate set of class loaders that were
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||||
created when the launcher located and ran the application classes.<span
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||||
style='mso-spacerun:yes'><EFBFBD> </span>This means that the search for Variant will
|
||||
fail usually with the silent and immediate termination of the Java application.<span
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||||
style='mso-spacerun:yes'><EFBFBD> </span>The thread <span class=SpellE>classloader</span>
|
||||
</span>The Jacob C++ library uses FindClass() to find the Variant class when
|
||||
building the parameter list.<span style='mso-spacerun:yes'><EFBFBD> </span>FindClass()
|
||||
uses the system class loader which includes only the classes specified at run
|
||||
time or in the CLASSPATH.<span style='mso-spacerun:yes'><EFBFBD> </span>Most of the
|
||||
application classes in this situation live in an alternate set of class loaders
|
||||
that were created when the launcher located and ran the application
|
||||
classes.<span style='mso-spacerun:yes'><EFBFBD> </span>This means that the search for
|
||||
Variant will fail usually with the silent and immediate termination of the Java
|
||||
application.<span style='mso-spacerun:yes'><EFBFBD> </span>The thread classloader
|
||||
probably can<61>t be used to try and find the class because this new thread does
|
||||
not have a <span class=SpellE>classloader</span> associated with it other than
|
||||
the system class loader.<span style='mso-spacerun:yes'><EFBFBD> </span>The end result
|
||||
is that the Variant class needs to be located via other means and that the
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||||
thread <span class=SpellE>classloader</span> should be set to be the context
|
||||
class loader of the event handler class.</p>
|
||||
not have a classloader associated with it other than the system class
|
||||
loader.<span style='mso-spacerun:yes'><EFBFBD> </span>The end result is that the
|
||||
Variant class needs to be located via other means and that the thread
|
||||
classloader should be set to be the context class loader of the event handler
|
||||
class.</p>
|
||||
|
||||
<p class=MsoPlainText><o:p> </o:p></p>
|
||||
|
||||
<p class=MsoPlainText>The Jacob <span class=SpellE>EventProxy</span> class has
|
||||
been modified (off of the 1.8 tree) so that it takes a two step approach to
|
||||
towards fixing these problems.</p>
|
||||
<p class=MsoPlainText><b>1.8 and 1.9 behavior</b></p>
|
||||
|
||||
<p class=MsoPlainText>The Jacob EventProxy class has been modified (off of the
|
||||
1.8 tree) so that it takes a two step approach <span
|
||||
style='mso-spacerun:yes'><EFBFBD></span>towards fixing these problems.</p>
|
||||
|
||||
<p class=MsoPlainText><span style='mso-tab-count:2'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span></p>
|
||||
|
||||
@@ -287,28 +320,26 @@ towards fixing these problems.</p>
|
||||
l0 level1 lfo4;tab-stops:list 42.0pt'><![if !supportLists]><span
|
||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>1)<span
|
||||
style='font:7.0pt "Times New Roman"'>
|
||||
</span></span></span><![endif]>The <span class=SpellE>EventProxy</span>
|
||||
constructor now accepts an extra object, an instance of the Variant class.<span
|
||||
style='mso-spacerun:yes'><EFBFBD> </span>This gives the <span class=SpellE>EventProxy</span>
|
||||
a way to get to the Variant class and thus to its <span class=SpellE>classloader</span>.
|
||||
All of the callers of the constructor have been modified to pass a Variant
|
||||
object to the <span class=SpellE>EventProxy</span> without programmer
|
||||
intervention.</p>
|
||||
</span></span></span><![endif]>The EventProxy constructor now accepts an extra
|
||||
object, an instance of the Variant class.<span style='mso-spacerun:yes'><EFBFBD>
|
||||
</span>This gives the EventProxy a way to get to the Variant class and thus to
|
||||
its classloader. All of the callers of the constructor have been modified to
|
||||
pass a Variant object to the EventProxy without programmer intervention.</p>
|
||||
|
||||
<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
|
||||
l0 level1 lfo4;tab-stops:list 42.0pt'><![if !supportLists]><span
|
||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>2)<span
|
||||
style='font:7.0pt "Times New Roman"'>
|
||||
</span></span></span><![endif]><span class=SpellE>EventProxy</span> first
|
||||
attempts to locate the Variant class using <span class=SpellE>FindClass</span>()</p>
|
||||
</span></span></span><![endif]>EventProxy first attempts to locate the Variant
|
||||
class using FindClass()</p>
|
||||
|
||||
<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
|
||||
l0 level1 lfo4;tab-stops:list 42.0pt'><![if !supportLists]><span
|
||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>3)<span
|
||||
style='font:7.0pt "Times New Roman"'>
|
||||
</span></span></span><![endif]>Failing that, it looks to see if a variant
|
||||
object had been passed in. If so, it calls <span class=GramE>class(</span>) and
|
||||
goes from there.<span style='mso-spacerun:yes'><EFBFBD> </span></p>
|
||||
object had been passed in. If so, it calls class() and goes from there.<span
|
||||
style='mso-spacerun:yes'><EFBFBD> </span></p>
|
||||
|
||||
<p class=MsoPlainText style='margin-left:42.0pt;text-indent:-24.0pt;mso-list:
|
||||
l0 level1 lfo4;tab-stops:list 42.0pt'><![if !supportLists]><span
|
||||
@@ -317,24 +348,46 @@ style='font:7.0pt "Times New Roman"'>
|
||||
</span></span></span><![endif]>If all that fails, it logs a message and then
|
||||
fails in the spectacular fashion of the previous versions.</p>
|
||||
|
||||
<p class=MsoPlainText><b>1.10 behavior</b></p>
|
||||
|
||||
<p class=MsoPlainText>The Jacob EventProxy class has been modified so that it
|
||||
takes a different approach towards fixing this problem.</p>
|
||||
|
||||
<p class=MsoPlainText style='margin-left:.75in;text-indent:-.25in;mso-list:
|
||||
l1 level1 lfo6;tab-stops:list .75in'><![if !supportLists]><span
|
||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>1.<span
|
||||
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>All
|
||||
objects that request event notification are now wrapped in a Java
|
||||
InvocationProxy so that a standard interface is always presented to the JNI
|
||||
EventProxy object.</p>
|
||||
|
||||
<p class=MsoPlainText style='margin-left:.75in;text-indent:-.25in;mso-list:
|
||||
l1 level1 lfo6;tab-stops:list .75in'><![if !supportLists]><span
|
||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>2.<span
|
||||
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>The
|
||||
EventProxy constructor accepts an Java InvocationProxy as the object that will
|
||||
receive any callbacks for this set of events.</p>
|
||||
|
||||
<p class=MsoPlainText style='margin-left:.75in;text-indent:-.25in;mso-list:
|
||||
l1 level1 lfo6;tab-stops:list .75in'><![if !supportLists]><span
|
||||
style='mso-fareast-font-family:"Courier New"'><span style='mso-list:Ignore'>3.<span
|
||||
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>The
|
||||
Java InvocationProxy has a method on it that will return the Variant class that
|
||||
the EventProxy.</p>
|
||||
|
||||
<p class=MsoPlainText><o:p> </o:p></p>
|
||||
|
||||
<p class=MsoPlainText>Developers can receive call back events in JWS other Java
|
||||
launching programs without implementing any additional code.<span
|
||||
style='mso-spacerun:yes'><EFBFBD> </span>They should be aware that their callback
|
||||
methods may need to set the class <span class=GramE>loader.:</span></p>
|
||||
methods may need to set the class loader. If they expect to create any objects.:</p>
|
||||
|
||||
<p class=MsoPlainText><span style='mso-tab-count:1'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>Public xxx <span
|
||||
class=SpellE><span class=GramE>someHandler</span></span><span class=GramE>(</span>Variant[]
|
||||
<span class=SpellE>foo</span>){</p>
|
||||
<p class=MsoPlainText><span style='mso-tab-count:1'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>Public xxx
|
||||
someHandler(Variant[] foo){</p>
|
||||
|
||||
<p class=MsoPlainText><span style='mso-tab-count:2'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span><span
|
||||
class=SpellE><span class=GramE>Thread.currentThread</span></span><span
|
||||
class=GramE>(</span>).<span class=SpellE>setContextClassLoader</span>(</p>
|
||||
<p class=MsoPlainText><span style='mso-tab-count:2'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>Thread.currentThread().setContextClassLoader(</p>
|
||||
|
||||
<p class=MsoPlainText><span style='mso-tab-count:3'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span><span
|
||||
class=SpellE><span class=GramE>this.getClass</span></span><span class=GramE>(</span>).<span
|
||||
class=SpellE>getClassLoader</span>());</p>
|
||||
<p class=MsoPlainText><span style='mso-tab-count:3'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>this.getClass().getClassLoader());</p>
|
||||
|
||||
<p class=MsoPlainText><span style='mso-tab-count:2'><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> </span>// do
|
||||
something</p>
|
||||
|
||||
@@ -30,11 +30,10 @@
|
||||
has been added to the DispatchEvents constructors that lets a user provide
|
||||
the location of the OLB or EXE that contains the information required to
|
||||
retrieve the events.
|
||||
<li>Event handlers can now return a value to calling MS Windows program.
|
||||
The event handlers must return an objec of type Variant if they wish to return
|
||||
a value. All
|
||||
previous event handlers still work with a void return. (This change should be
|
||||
backwards compatible)
|
||||
<li>Event handlers can now return a Variant to calling MS Windows program.
|
||||
Event handlers that do not return an object should still be defined
|
||||
as being of type "void". This means that support for event handler's returning
|
||||
values should be backwards compatible with previous releases.
|
||||
</ul>
|
||||
</li>
|
||||
|
||||
|
||||
Reference in New Issue
Block a user