X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=org.argeo.cms.jcr.ui%2Fsrc%2Forg%2Fargeo%2Feclipse%2Fui%2Fjcr%2FAsyncUiEventListener.java;fp=org.argeo.cms.jcr.ui%2Fsrc%2Forg%2Fargeo%2Feclipse%2Fui%2Fjcr%2FAsyncUiEventListener.java;h=b880a63c5fa11dc39e065bab6e17342778789d35;hb=bce03099b0d2f1758e7a3d74fba339d0200924d5;hp=0000000000000000000000000000000000000000;hpb=0ea2992e5f3803cd98b5981f27274faa922bc199;p=gpl%2Fargeo-jcr.git

diff --git a/org.argeo.cms.jcr.ui/src/org/argeo/eclipse/ui/jcr/AsyncUiEventListener.java b/org.argeo.cms.jcr.ui/src/org/argeo/eclipse/ui/jcr/AsyncUiEventListener.java
new file mode 100644
index 0000000..b880a63
--- /dev/null
+++ b/org.argeo.cms.jcr.ui/src/org/argeo/eclipse/ui/jcr/AsyncUiEventListener.java
@@ -0,0 +1,83 @@
+package org.argeo.eclipse.ui.jcr;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.jcr.RepositoryException;
+import javax.jcr.observation.Event;
+import javax.jcr.observation.EventIterator;
+import javax.jcr.observation.EventListener;
+
+import org.argeo.api.cms.CmsLog;
+import org.argeo.eclipse.ui.EclipseUiException;
+import org.eclipse.swt.widgets.Display;
+
+/**
+ * {@link EventListener} which simplifies running actions within the UI thread.
+ */
+public abstract class AsyncUiEventListener implements EventListener {
+	// private final static Log logSuper = LogFactory
+	// .getLog(AsyncUiEventListener.class);
+	private final CmsLog logThis = CmsLog.getLog(getClass());
+
+	private final Display display;
+
+	public AsyncUiEventListener(Display display) {
+		super();
+		this.display = display;
+	}
+
+	/** Called asynchronously in the UI thread. */
+	protected abstract void onEventInUiThread(List<Event> events) throws RepositoryException;
+
+	/**
+	 * Whether these events should be processed in the UI or skipped with no UI
+	 * job created.
+	 */
+	protected Boolean willProcessInUiThread(List<Event> events) throws RepositoryException {
+		return true;
+	}
+
+	protected CmsLog getLog() {
+		return logThis;
+	}
+
+	public final void onEvent(final EventIterator eventIterator) {
+		final List<Event> events = new ArrayList<Event>();
+		while (eventIterator.hasNext())
+			events.add(eventIterator.nextEvent());
+
+		if (logThis.isTraceEnabled())
+			logThis.trace("Received " + events.size() + " events");
+
+		try {
+			if (!willProcessInUiThread(events))
+				return;
+		} catch (RepositoryException e) {
+			throw new EclipseUiException("Cannot test skip events " + events, e);
+		}
+
+		// Job job = new Job("JCR Events") {
+		// protected IStatus run(IProgressMonitor monitor) {
+		// if (display.isDisposed()) {
+		// logSuper.warn("Display is disposed cannot update UI");
+		// return Status.CANCEL_STATUS;
+		// }
+
+		if (!display.isDisposed())
+			display.asyncExec(new Runnable() {
+				public void run() {
+					try {
+						onEventInUiThread(events);
+					} catch (RepositoryException e) {
+						throw new EclipseUiException("Cannot process events " + events, e);
+					}
+				}
+			});
+
+		// return Status.OK_STATUS;
+		// }
+		// };
+		// job.schedule();
+	}
+}