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Re: [eclipse-dev] Eclipse beginner threading question... 
Horst

This list is meant for news about the development of Eclipse - these sort 
of questions are better asked in the newsgroups.

All calls to SWT must be done in the UI Thread. You can do this using 
Display.asyncExec() Display,syncExec() or a UIJob.

Tod




Horst Heistermann <horst.heistermann@xxxxxxxxxx> 
Sent by: eclipse-dev-bounces@xxxxxxxxxxx
04/26/2005 04:19 PM
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Subject
[eclipse-dev] Eclipse beginner threading question...






Hi,

 I am new to eclipse and I am having a problem with threads. I have 
created a MultiPageEditorPart
editor. I have a background thread listening to model changes in my 
application. I am notified of these changes
in a non -gui thread. I want to set MultiPageEditorPart as dirty 
whenever I receive a model change event.
So I wrote a function like this

public void setEditorModified() {
       m_bModified = true;
       if (!super.isDirty()) {
           firePropertyChange(IEditorPart.PROP_DIRTY);
       }
   }


This method crashes whenever I call it from the background thread. Below 
is the error stack. But it is a bit misleading. From the debugger, I can 
see the issue is with the thread I am calling firePropertyChange() from. 
Can anyone tell me what is the proper  way to update the dirty state 
from a background thread. Also, the background thread is not aware of 
the GUI components it only has a refer.


java.lang.NullPointerException
   at 
org.eclipse.jface.dialogs.IconAndMessageDialog.getSWTImage(IconAndMessageDialog.java:225) 


   at 
org.eclipse.jface.dialogs.IconAndMessageDialog.getErrorImage(IconAndMessageDialog.java:172) 


   at 
org.eclipse.jface.dialogs.MessageDialog.<init>(MessageDialog.java:141)
   at 
org.eclipse.jface.dialogs.MessageDialog.openError(MessageDialog.java:310)
   at 
org.eclipse.jface.util.SafeRunnable.handleException(SafeRunnable.java:59)
   at 
org.eclipse.core.internal.runtime.InternalPlatform.handleException(InternalPlatform.java:703) 


   at 
org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1023) 


   at org.eclipse.core.runtime.Platform.run(Platform.java:757)
   at 
org.eclipse.ui.part.WorkbenchPart.firePropertyChange(WorkbenchPart.java:121) 


   at 
horst.modeler.editors.BPELModelerEditor.setEditorModified(BPELModelerEditor.java:103) 


   at 
horst.modeler.editors.BPELModelerEditor.threadSafeSetEditorModified(BPELModelerEditor.java:96) 


   at 
horst.modeler.editors.BPELModelerEditor$1.graphNodesInserted(BPELModelerEditor.java:142) 


   at 
oracle.tip.tools.ide.common.graph.AbstractGraphModel.fireGraphNodesInserted(AbstractGraphModel.java:391) 


   at 
oracle.tip.tools.ide.common.graph.AbstractGraphModel.insertChildNode(AbstractGraphModel.java:132) 


   at 
oracle.tip.tools.ide.pm.bpelgraph.collaxalaf.BPELDNDDropHandler.handleDrop(BPELDNDDropHandler.java:202) 


   at 
oracle.tip.tools.ide.common.graph.DefaultGraphPaneDropTargetListener.routeToDropHandler(DefaultGraphPaneDropTargetListener.java:212) 


   at 
oracle.tip.tools.ide.common.graph.DefaultGraphPaneDropTargetListener.handleDrop(DefaultGraphPaneDropTargetListener.java:200) 


   at 
oracle.tip.tools.ide.pm.bpelgraph.collaxalaf.BPELGraphPaneDropTargetListener.handleDrop(BPELGraphPaneDropTargetListener.java:75) 


   at 
oracle.tip.tools.ide.common.graph.DefaultGraphPaneDropTargetListener.drop(DefaultGraphPaneDropTargetListener.java:260) 


   at java.awt.dnd.DropTarget.drop(Unknown Source)
   at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(Unknown 
Source)
   at sun.awt.dnd.SunDropTargetContextPeer.access$800(Unknown Source)
   at 
sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(Unknown 

Source)
   at 
sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(Unknown 

Source)
   at sun.awt.dnd.SunDropTargetEvent.dispatch(Unknown Source)
   at java.awt.Component.dispatchEventImpl(Unknown Source)
   at java.awt.Container.dispatchEventImpl(Unknown Source)
   at java.awt.Component.dispatchEvent(Unknown Source)
   at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
   at java.awt.LightweightDispatcher.processDropTargetEvent(Unknown 
Source)
   at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
   at java.awt.Container.dispatchEventImpl(Unknown Source)
   at java.awt.Component.dispatchEvent(Unknown Source)
   at java.awt.EventQueue.dispatchEvent(Unknown Source)
   at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown 
Source)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.run(Unknown Source)
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