JPDA 架构研究21 - JDI的Debugger的UI部分

引入：

前面揭示了JDI的Debugger如何建立连接，发送和处理请求，这里我们专注于人机交互部分，Debugger的UI，它主要负责如何把人发出的操作转为请求，以及把请求操作反映在调试器的界面上。

分析：

这个插件主要都定义在org.eclipse.jdt.debug.ui_<Version>.jar中的plugin.xml中，它提供了各种人机交互的插件功能。打的比方，我们看编辑器功能：

<extension
         point="org.eclipse.ui.editorActions">
      <editorContribution
            targetID="org.eclipse.jdt.ui.CompilationUnitEditor"
            id="org.eclipse.jdt.debug.CompilationUnitEditor.BreakpointRulerActions">
         <action
               label="%AddBreakpoint.label"
               class="org.eclipse.debug.ui.actions.RulerToggleBreakpointActionDelegate"
               actionID="RulerDoubleClick"
               id="org.eclipse.jdt.debug.ui.actions.ManageBreakpointRulerAction">
         </action>
      </editorContribution>
      <editorContribution
            targetID="org.eclipse.jdt.ui.ClassFileEditor"
            id="org.eclipse.jdt.debug.ClassFileEditor.BreakpointRulerActions">
         <action
               label="%AddBreakpoint.label"
               class="org.eclipse.debug.ui.actions.RulerToggleBreakpointActionDelegate"
               actionID="RulerDoubleClick"
               id="org.eclipse.jdt.debug.ui.actions.ManageBreakpointRulerAction">
         </action>
      </editorContribution>
      <editorContribution
            targetID="org.eclipse.jdt.debug.ui.SnippetEditor"
            id="org.eclipse.jdt.debug.ui.JavaSnippetToolbarActions">
         <action
               toolbarPath="evaluationGroup"
               id="org.eclipse.jdt.debug.ui.SnippetExecute"
               hoverIcon="$nl$/icons/full/etool16/run_sbook.gif"
               class="org.eclipse.jdt.internal.debug.ui.actions.ExecuteAction"
               disabledIcon="$nl$/icons/full/dtool16/run_sbook.gif"
               enablesFor="+"
               icon="$nl$/icons/full/etool16/run_sbook.gif"
               helpContextId="execute_action_context"
               label="%Execute.label"
               tooltip="%Execute.tooltip">
            <selection
                  class="org.eclipse.jface.text.ITextSelection">
            </selection>
         </action>
         <action
               toolbarPath="evaluationGroup"
               id="org.eclipse.jdt.debug.ui.SnippetDisplay"
               hoverIcon="$nl$/icons/full/etool16/disp_sbook.gif"
               class="org.eclipse.jdt.internal.debug.ui.actions.PopupDisplayAction"
               disabledIcon="$nl$/icons/full/dtool16/disp_sbook.gif"
               enablesFor="+"
               icon="$nl$/icons/full/etool16/disp_sbook.gif"
               helpContextId="display_action_context"
               label="%Display.label"
               tooltip="%Display.tooltip">
            <selection
                  class="org.eclipse.jface.text.ITextSelection">
            </selection>
         </action>
         <action
               toolbarPath="evaluationGroup"
               id="org.eclipse.jdt.debug.ui.SnippetInspect"
               hoverIcon="$nl$/icons/full/etool16/insp_sbook.gif"
               class="org.eclipse.jdt.internal.debug.ui.actions.PopupInspectAction"
               disabledIcon="$nl$/icons/full/dtool16/insp_sbook.gif"
               enablesFor="+"
               icon="$nl$/icons/full/etool16/insp_sbook.gif"
               helpContextId="inspect_action_context"
               label="%Inspect.label"
               tooltip="%Inspect.tooltip">
            <selection
                  class="org.eclipse.jface.text.ITextSelection">
            </selection>
         </action>
      </editorContribution>
   </extension>

从这里看出，它支持好几个操作：如CompilationUnitEditor的打断点 ，ClassFileEditor的打断点等。

每个操作都有用到的图标，用到的action响应类等，有兴趣的可以看下。