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Notify associated element [message #987448]

Mon, 26 November 2012 16:17

Matthias N

Messages: 66
Registered: June 2012

Member

Hi,

I have the following scenario:

+-----------+                 +----------+
| Parent    |1               *| Children |
|           |-----------------|          |
+-----------+                 +----------+
A Parent is associated with several children (Note: NO containment reference)

What I want to do is the following:

When one of the parent's attributes changes, the children shall be notified.

I implemented handleNotificationEvent in parentEditPart:

@Override
 protected void handleNotificationEvent(Notification notification) {
  super.handleNotificationEvent(notification);
  //something has changed, notify my associated Children
  Parent parent = (Parent) this.resolveSemanticElement();
  for (Children c : parent.getChildren()) {
   c.eNotify(notification);
  }		
 }

And I am awaiting the Notification in ChildrenEditPart:

@Override
 protected void handleNotificationEvent(Notification notification) {
  super.handleNotificationEvent(notification);
  system.out.println("something has changed, update myself!!");	
 }

However it does not work, I get:

java.lang.StackOverflowError
	at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474)
	at org.eclipse.gmf.runtime.diagram.core.DiagramEditingDomainFactory$DiagramEditingDomain.postcommit(DiagramEditingDomainFactory.java:220)
	at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.deactivate(TransactionalEditingDomainImpl.java:543)
	at org.eclipse.emf.transaction.impl.TransactionImpl.close(TransactionImpl.java:712)
	at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474)
	at org.eclipse.gmf.runtime.diagram.core.DiagramEditingDomainFactory$DiagramEditingDomain.postcommit(DiagramEditingDomainFactory.java:220)
	at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.deactivate(TransactionalEditingDomainImpl.java:543)
	at org.eclipse.emf.transaction.impl.TransactionImpl.close(TransactionImpl.java:712)
	at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474)
	at org.eclipse.gmf.runtime.diagram.core.DiagramEditingDomainFactory$DiagramEditingDomain.postcommit(DiagramEditingDomainFactory.java:220)
	at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.deactivate(TransactionalEditingDomainImpl.java:543)
	at org.eclipse.emf.transaction.impl.TransactionImpl.close(TransactionImpl.java:712)
	at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474)
...

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Re: Notify associated element [message #987455 is a reply to message #987448]

Mon, 26 November 2012 16:53

Andreas Muelder

Messages: 73
Registered: July 2011

Member

Hi Matthias,

I had a similar usecase and I did it the other way arround.

I added the listener to Parent in my ChildEditPart like this:

@Override
protected void addSemanticListeners() {
	addListenerFilter(PARENT_VIEW, this, ((Child) resolveSemanticElement()).getParent);
	super.addSemanticListeners();
}

@Override
protected void removeSemanticListeners() {
	removeListenerFilter(PARENT_VIEW);
	super.removeSemanticListeners();
	}

Regards,

Andreas

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