Home » Eclipse Projects » Remote Application Platform (RAP) » Update ui for OSGi-EventAdmin-Event(Receiving an Event from EventAdmin want to update the RAP UI)
| Update ui for OSGi-EventAdmin-Event [message #652279] |
Thu, 03 February 2011 12:55  |
 Stefan Klaus
Messages: 21
Registered: February 2011 |
Junior Member |
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Hello!
I'm trying to show an Event received via OSGi-EventAdmin. Within my RCP-App everything works fine. Thanks to Tom Schindl and http://tomsondev.bestsolution.at/2011/01/03/enhanced-rcp-how -views-can-communicate/ .
Now in RAP I tried first following:
class ... {
...
Composite parent;
TableViewer tableViewer;
@Override
protected Composite createEventCompositeInternal(final Composite parent) {
this.parent = parent;
this.tableViewer = new TableViewer(composite);
BundleContext ctx = FrameworkUtil.getBundle(Client.class)
.getBundleContext();
EventHandler handler = new EventHandler() {
public void handleEvent(final Event event) {
UICallBack.activate("alarm");
Thread bgThread = new Thread(createRunnable(event));
bgThread.setDaemon(true);
bgThread.start();
}
};
Dictionary<String, String> properties = new Hashtable<String, String>();
properties.put(EventConstants.EVENT_TOPIC, "events");
ctx.registerService(EventHandler.class.getName(), handler, properties);
return composite;
}
private Runnable createRunnable(final Event event) {
return new Runnable() {
public void run() {
// do some work...
// schedule the UI update
parent.getDisplay().asyncExec(new Runnable() {
public void run() {
// update the UI
tableViewer.add(event.toString());
}
});
// Deactivate the UI call-back
parent.getDisplay().asyncExec(new Runnable() {
public void run() {
UICallBack.deactivate("alarm");
}
});
}
};
}
But this throws the following exception:
Log ErrorException while dispatching event org.osgi.service.event.Event [topic=events] to handler client.EventCompositeFacadeImpl$2@5ecfe500
java.lang.IllegalStateException: No context available outside of the request service lifecycle.
Looking in the RAP-FAQ for the IllegalstateException then tried UICallBack#runNonUIThreadWithFakeContext:
class...{
Composite parent;
TableViewer tableViewer;
@Override
protected Composite createEventCompositeInternal(final Composite parent) {
this.parent = parent;
Composite composite = new Composite(parent, SWT.NONE);
composite.setLayout(new FillLayout());
this.tableViewer = new TableViewer(composite);
this.tableViewer.getTable().setHeaderVisible(true);
this.tableViewer.getTable().setLinesVisible(true);
this.tableViewer.setLabelProvider(new ColumnLabelProvider() {
@Override
public String getText(Object element) {
// return DateFormat.getDateTimeInstance().format(element);
return element.toString();
}
});
BundleContext ctx = FrameworkUtil.getBundle(Client.class)
.getBundleContext();
EventHandler handler = new EventHandler() {
public void handleEvent(final Event event) {
UICallBack.runNonUIThreadWithFakeContext(parent.getDisplay(),
new Runnable() {
public void run() {
// do some work...
// schedule the UI update
parent.getDisplay().asyncExec(new Runnable() {
public void run() {
// update the UI
tableViewer.add(event.toString());
}
});
}
});
}
};
Dictionary<String, String> properties = new Hashtable<String, String>();
properties.put(EventConstants.EVENT_TOPIC, "events");
ctx.registerService(EventHandler.class.getName(), handler, properties);
No Exception is thrown, but the UI does not automatically refresh. I have to first resize the browser window or the click in the tableviewer to see the new added events to the table.
Any suggestions?
Thanks for your help.
Stefan
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| Re: Update ui for OSGi-EventAdmin-Event [message #652288 is a reply to message #652279] |
Thu, 03 February 2011 13:36  |
Ivan Furnadjiev
Messages: 2426
Registered: July 2009
Location: Sofia, Bulgaria |
Senior Member |
|
|
Hi Stefan,
in your second example the UICallBack is not activated at all, thus UI
does not automatically refresh.
HTH,
Ivan
On 2/3/2011 2:55 PM, Stefan wrote:
> Hello!
>
> I'm trying to show an Event received via OSGi-EventAdmin. Within my
> RCP-App everything works fine. Thanks to Tom Schindl and
> http://tomsondev.bestsolution.at/2011/01/03/enhanced-rcp-how -views-can-communicate/
> .
>
> Now in RAP I tried first following:
>
> class ... {
> ..
> Composite parent;
> TableViewer tableViewer;
>
> @Override
> protected Composite createEventCompositeInternal(final Composite
> parent) {
> this.parent = parent;
> this.tableViewer = new TableViewer(composite);
>
> BundleContext ctx = FrameworkUtil.getBundle(Client.class)
> .getBundleContext();
> EventHandler handler = new EventHandler() {
> public void handleEvent(final Event event) {
> UICallBack.activate("alarm");
> Thread bgThread = new Thread(createRunnable(event));
> bgThread.setDaemon(true);
> bgThread.start();
>
> }
> };
>
> Dictionary<String, String> properties = new Hashtable<String,
> String>();
> properties.put(EventConstants.EVENT_TOPIC, "events");
> ctx.registerService(EventHandler.class.getName(), handler,
> properties);
>
> return composite;
> }
>
> private Runnable createRunnable(final Event event) {
> return new Runnable() {
> public void run() {
> // do some work...
> // schedule the UI update
> parent.getDisplay().asyncExec(new Runnable() {
> public void run() {
> // update the UI
> tableViewer.add(event.toString());
> }
> });
> // Deactivate the UI call-back
> parent.getDisplay().asyncExec(new Runnable() {
> public void run() {
> UICallBack.deactivate("alarm");
> }
> });
> }
> };
> }
>
>
> But this throws the following exception:
> Log ErrorException while dispatching event
> org.osgi.service.event.Event [topic=events] to handler
> client.EventCompositeFacadeImpl$2@5ecfe500
> java.lang.IllegalStateException: No context available outside of the
> request service lifecycle.
>
> Looking in the RAP-FAQ for the IllegalstateException then tried
> UICallBack#runNonUIThreadWithFakeContext:
>
> class...{
> Composite parent;
> TableViewer tableViewer;
>
> @Override
> protected Composite createEventCompositeInternal(final Composite
> parent) {
> this.parent = parent;
> Composite composite = new Composite(parent, SWT.NONE);
> composite.setLayout(new FillLayout());
>
> this.tableViewer = new TableViewer(composite);
> this.tableViewer.getTable().setHeaderVisible(true);
> this.tableViewer.getTable().setLinesVisible(true);
> this.tableViewer.setLabelProvider(new ColumnLabelProvider() {
> @Override
> public String getText(Object element) {
> // return
> DateFormat.getDateTimeInstance().format(element);
> return element.toString();
> }
> });
>
> BundleContext ctx = FrameworkUtil.getBundle(Client.class)
> .getBundleContext();
> EventHandler handler = new EventHandler() {
> public void handleEvent(final Event event) {
> UICallBack.runNonUIThreadWithFakeContext(parent.getDisplay() ,
> new Runnable() {
> public void run() {
> // do some work...
> // schedule the UI update
> parent.getDisplay().asyncExec(new
> Runnable() {
> public void run() {
> // update the UI
>
> tableViewer.add(event.toString());
> }
> });
> }
> });
>
> }
> };
>
> Dictionary<String, String> properties = new Hashtable<String,
> String>();
> properties.put(EventConstants.EVENT_TOPIC, "events");
> ctx.registerService(EventHandler.class.getName(), handler,
> properties);
>
>
> No Exception is thrown, but the UI does not automatically refresh. I
> have to first resize the browser window or the click in the
> tableviewer to see the new added events to the table.
>
> Any suggestions?
> Thanks for your help.
> Stefan
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| Re: Update ui for OSGi-EventAdmin-Event [message #652335 is a reply to message #652324] |
Thu, 03 February 2011 15:36 |
Ivan Furnadjiev
Messages: 2426
Registered: July 2009
Location: Sofia, Bulgaria |
Senior Member |
|
|
Hi Stefan,
it's great that your code is running fine now. I will suggest to
deactivate the UICallBack when it is not needed anymore. In other words
- activate before you start the background thread, deactivate it when
the job is done.
Best,
Ivan
On 2/3/2011 5:19 PM, Stefan wrote:
> Short answer but very helpful! :d
> For others searching the same question here the running code:
>
> ..
> UICallBack.activate("alarm");
>
> BundleContext ctx = FrameworkUtil.getBundle(Client.class)
> .getBundleContext();
> EventHandler handler = new EventHandler() {
> public void handleEvent(final Event event) {
>
>
> Thread bgThread = new Thread(createRunnable(event));
> bgThread.setDaemon(true);
> bgThread.start();
>
> }
> };
>
> Dictionary<String, String> properties = new
> Hashtable<String, String>();
> properties.put(EventConstants.EVENT_TOPIC, "Events");
> ctx.registerService(EventHandler.class.getName(), handler,
> properties);
>
> ..
> private Runnable createRunnable(final Event event) {
> return new Runnable() {
> public void run() {
>
> UICallBack.runNonUIThreadWithFakeContext(parent.getDisplay() ,
> new Runnable() {
> public void run() {
> // do some work...
> // schedule the UI update
> parent.getDisplay().asyncExec(new
> Runnable() {
> public void run() {
> // update the UI
>
> tableViewer.add(event.toString());
> }
> });
> }
> });
> }
> };
> }
>
>
>
>
>
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