TT 9 Resource change tracking in Java

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TT 9 Resource change tracking
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public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException { monitorbeginTask( "simulate progress in status bar:", 20); for (int i = 20; i > 0; --i) { monitorsubTask("seconds left = " + i); try { Threadsleep(1000); } catch (InterruptedException e) { // ignored } monitorworked(1); } monitordone(); } }); } catch (InvocationTargetException e) { FavoritesLoglogError(e); } catch (InterruptedException e) { // user canceled the operation just ignore } }
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If you have a view or editor, you can obtain the containing IWorkbenchWindow
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via IWorkbenchPart which both IViewPart and IEditorPart extend:
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IWorkbenchWindow window = viewOrEditorgetWorkbenchSite()getWorkbenchWindow();
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You can also obtain the progress monitor in the status bar directly via the IStatusLineManager interface:
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viewPartgetViewSite()getActionBars() getStatusLineManager()getProgressMonitor()
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Delayed changed events
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editorPartgetEditorSite()getActionBars() getStatusLineManager()getProgressMonitor()
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Eclipse is based upon lazy initialization only load a plug-in when it is needed This lazy initialization presents a problem for plug-ins that need to track changes How does a plug-in track changes when it is not loaded Eclipse solves this problem by queuing change events for a plug-in that is not loaded When the plug-in is loaded, it receives a single resource change event containing the union of the changes that have occurred during the time it was not active To receive this event, your plug-in must register to be a save participant when it is started up:
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public static void addSaveParticipant() { ISaveParticipant saveParticipant = new ISaveParticipant(){ public void saving(ISaveContext context) throws CoreException { // save any model state here contextneedDelta(); } public void doneSaving(ISaveContext context) {} public void prepareToSave(ISaveContext context)
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TT 9 Resource change tracking
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throws CoreException {} public void rollback(ISaveContext context) {} }; ISavedState savedState; try { savedState = ResourcesPlugin getWorkspace() addSaveParticipant( FavoritesPlugingetDefault(), saveParticipant); } catch (CoreException e) { FavoritesLoglogError(e); // recover if necessary return; } if (savedState != null) savedStateprocessResourceChangeEvents( FavoritesManagergetManager()); }
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Tip: Even though Eclipse is based upon lazy plug-in initialization, it does provide a mechanism for plug-ins to start when the workbench itself starts In order to activate at startup, the plug-in must extend the
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extension point and implement the interface Once the plug-in is started, the work-
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bench will call the plug-in s earlyStartup() method (see Section 342) A workbench preference option gives the user the ability to prevent a plug-in from starting early, so make sure that, if your plug-in takes advantage of this extension point, it degrades gracefully in the event that it is not started early
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RFWS Considerations
96 RFWS CONSIDERATIONS
The Workspace Resource and Event Processing section of the RFWS Requirements includes a single requirement for dealing with resource change events Requirement #1 states: Add a IResourceChangeListener to the Workspace if you need to be aware or react to changes in resources For example, you may use your plug-in s startup method to add custom workspace listeners to the runtime platform The startup method is automatically invoked by the platform core the first time any code in the plug-in is executed For this test, describe any scenarios where your plug-in reacts to workspace change events For the Favorites view, we would show that deleting resource from the workspace also deletes it from the Favorites view
TT 9 Resource change tracking
97 SUMMARY
In this chapter, we demonstrated how to process resource change events propagated by the system Any time a resource is added, modified or removed, a corresponding change event is generated Responding to these events provides a way for your plug-in to stay synchronized with the Eclipse environment
C H A P T E R
Perspectives
Perspectives are a way to group Eclipse views and actions for a particular task such as coding or debugging Larger Eclipse enhancements that involve multiple plugins may provide their own perspectives Smaller Eclipse enhancements that involve only one or two plugins and provide only one or two new Eclipse views typically enhance existing perspectives rather than provide entirely new perspectives In this chapter, we further extend the favorites example by creating a new perspective for hosting the Favorites view and show how to add the Favorites view to existing perspectives