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/****************************************************************************
* Copyright (c) 2009 Composent, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Composent, Inc. - initial API and implementation
*****************************************************************************/
package org.eclipse.ecf.remoteservice.eventadmin;
import java.io.IOException;
import java.security.Permission;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.core.runtime.Assert;
import org.eclipse.ecf.core.sharedobject.BaseSharedObject;
import org.eclipse.ecf.core.sharedobject.SharedObjectMsg;
import org.eclipse.ecf.internal.remoteservice.eventadmin.DistributedEventAdminMessage;
import org.eclipse.ecf.internal.remoteservice.eventadmin.EventHandlerTracker;
import org.eclipse.ecf.internal.remoteservice.eventadmin.EventHandlerWrapper;
import org.eclipse.ecf.internal.remoteservice.eventadmin.LogTracker;
import org.eclipse.osgi.framework.eventmgr.CopyOnWriteIdentityMap;
import org.eclipse.osgi.framework.eventmgr.EventManager;
import org.eclipse.osgi.framework.eventmgr.ListenerQueue;
import org.osgi.framework.BundleContext;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;
import org.osgi.service.event.TopicPermission;
import org.osgi.service.log.LogService;
public class DistributedEventAdmin extends BaseSharedObject implements
EventAdmin {
private LogTracker log;
private EventHandlerTracker eventHandlerTracker;
private EventManager eventManager;
public DistributedEventAdmin(BundleContext context) {
Assert.isNotNull(context);
this.log = new LogTracker(context, System.out);
this.eventHandlerTracker = new EventHandlerTracker(context, log);
}
public void start() {
log.open();
ThreadGroup eventGroup = new ThreadGroup("Distributed EventAdmin"); //$NON-NLS-1$
eventGroup.setDaemon(true);
eventManager = new EventManager("Distributed EventAdmin Async Event Dispatcher Thread", eventGroup);
eventHandlerTracker.open();
}
public void stop() {
eventHandlerTracker.close();
eventManager.close();
eventManager = null;
log.close();
}
public void postEvent(final Event event) {
try {
sendSharedObjectMsgTo(null, SharedObjectMsg.createMsg(
"handlePostEvent", new DistributedEventAdminMessage(event)));
} catch (IOException e) {
logError("IOException posting distributed event "+event+" to "+event.getTopic(), e);
}
localDispatch(event, true);
}
public void sendEvent(Event event) {
localDispatch(event, false);
}
protected boolean handleSharedObjectMsg(SharedObjectMsg msg) {
try {
msg.invoke(this);
return true;
} catch (final Exception e) {
logError("handleSharedObjectMsg invoke error on msg=" + msg, e);
}
return false;
}
protected void localDispatch(Event event, boolean isAsync) {
EventManager currentManager = eventManager;
if (currentManager == null) {
return;
}
if (event == null) {
log.log(LogService.LOG_ERROR,
"Null event passed to EventAdmin was ignored.");
}
String eventTopic = event.getTopic();
try {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPermission(new TopicPermission(eventTopic,
TopicPermission.PUBLISH));
} catch (SecurityException e) {
logError("Caller bundle does not have TopicPermission to publish topic "+eventTopic, e);
throw e;
}
Set eventHandlerWrappers = eventHandlerTracker.getHandlers(eventTopic);
SecurityManager sm = System.getSecurityManager();
Permission perm = (sm == null) ? null : new TopicPermission(eventTopic,
TopicPermission.SUBSCRIBE);
CopyOnWriteIdentityMap listeners = new CopyOnWriteIdentityMap();
Iterator iter = eventHandlerWrappers.iterator();
while (iter.hasNext()) {
EventHandlerWrapper wrapper = (EventHandlerWrapper) iter.next();
listeners.put(wrapper, perm);
}
ListenerQueue listenerQueue = new ListenerQueue(currentManager);
listenerQueue.queueListeners(listeners.entrySet(), eventHandlerTracker);
if (isAsync) {
listenerQueue.dispatchEventAsynchronous(0, event);
}
else {
listenerQueue.dispatchEventSynchronous(0, event);
}
}
void handlePostEvent(DistributedEventAdminMessage event) {
localDispatch(event.getEvent(), true);
}
protected void logError(String message, Throwable exception) {
if (log != null) {
log.log(LogService.LOG_ERROR, message, exception);
} else {
System.err.println(message);
if (exception != null)
exception.printStackTrace(System.err);
}
}
}
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