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/*******************************************************************************
* Copyright (c) 2009 EclipseSource 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:
* EclipseSource - initial API and implementation
******************************************************************************/
package org.eclipse.ecf.remoteservice.eventadmin;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.ecf.core.identity.ID;
import org.eclipse.ecf.core.identity.IDFactory;
import org.eclipse.ecf.core.sharedobject.BaseSharedObject;
import org.eclipse.ecf.core.sharedobject.ISharedObjectContainer;
import org.eclipse.ecf.core.sharedobject.SharedObjectAddException;
import org.eclipse.ecf.core.sharedobject.SharedObjectMsg;
import org.eclipse.ecf.internal.remoteservice.eventadmin.DistributedEventAdminMessage;
import org.eclipse.equinox.concurrent.future.IExecutor;
import org.eclipse.equinox.concurrent.future.IProgressRunnable;
import org.eclipse.equinox.concurrent.future.ThreadsExecutor;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;
import org.osgi.service.event.EventConstants;
import org.osgi.service.event.EventHandler;
import org.osgi.util.tracker.ServiceTracker;
public class DistributedEventAdmin extends BaseSharedObject implements EventAdmin {
private BundleContext context;
private ServiceTracker eventHandlerServiceTracker;
private final Object eventHandlerSTLock = new Object();
private IExecutor executor;
private String topic;
private ID topicID;
public DistributedEventAdmin(BundleContext context, String topic, IExecutor executor) {
this.context = context;
Assert.isNotNull(this.context);
this.topic = topic;
Assert.isNotNull(this.topic);
this.topicID = IDFactory.getDefault().createStringID(getTopic());
this.executor = (executor == null)?new ThreadsExecutor():executor;
}
public DistributedEventAdmin(BundleContext context, String topic) {
this(context,topic,null);
}
public String getTopic() {
return topic;
}
public ID getTopicID() {
return topicID;
}
public void addToContainer(ISharedObjectContainer soContainer) throws SharedObjectAddException {
soContainer.getSharedObjectManager().addSharedObject(topicID, this, null);
}
public void removeFromContainer(ISharedObjectContainer soContainer) {
soContainer.getSharedObjectManager().removeSharedObject(getTopicID());
}
public ServiceRegistration register(Properties props) {
if (props == null) props = new Properties();
props.put(EventConstants.EVENT_TOPIC, getTopic());
return this.context.registerService(EventAdmin.class.getName(), this, props);
}
public ServiceRegistration register() {
return register(null);
}
public void dispose() {
if (eventHandlerServiceTracker != null) {
eventHandlerServiceTracker.close();
eventHandlerServiceTracker = null;
}
topic = null;
topicID = null;
executor = null;
}
public void postEvent(final Event event) {
try {
sendSharedObjectMsgTo(null, SharedObjectMsg.createMsg(
"handlePostEvent", new DistributedEventAdminMessage(event)));
localPostEvent(event);
} catch (IOException e) {
logError("postEvent exception event=" + event + " not sent.", e);
}
}
public void sendEvent(Event event) {
try {
sendSharedObjectMsgTo(null, SharedObjectMsg.createMsg(
"handleSendEvent", new DistributedEventAdminMessage(event)));
localSendEvent(event);
} catch (IOException e) {
logError("sendEvent exception event=" + event + " not sent.", e);
}
}
private ServiceReference[] getEventHandlerServiceReferences(Event event) {
synchronized (eventHandlerSTLock) {
if (eventHandlerServiceTracker == null) {
eventHandlerServiceTracker = new ServiceTracker(context,
EventHandler.class.getName(), null);
eventHandlerServiceTracker.open();
}
ServiceReference[] refs = eventHandlerServiceTracker
.getServiceReferences();
List results = new ArrayList();
if (refs == null)
return null;
for (int i = 0; i < refs.length; i++) {
String eventFilter = (String) refs[i]
.getProperty(EventConstants.EVENT_FILTER);
Filter filter = null;
if (eventFilter != null) {
try {
filter = context.createFilter(eventFilter);
if (event.matches(filter))
results.add(refs[i]);
} catch (InvalidSyntaxException e) {
logError("getEventHandlers eventFilter=" + eventFilter,
e);
continue;
}
} else
results.add(refs[i]);
}
return (ServiceReference[]) results
.toArray(new ServiceReference[] {});
}
}
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;
}
private void localSendEvent(Event event) {
ServiceReference[] eventHandlerRefs = getEventHandlerServiceReferences(event);
if (eventHandlerRefs == null) {
logWarning("sendEvent event=" + event
+ ". No service references found to post to.");
return;
}
// Now synchronously call every eventhandler
for (int i = 0; i < eventHandlerRefs.length; i++)
callSync(eventHandlerRefs[i], (EventHandler) context
.getService(eventHandlerRefs[i]), event);
}
private void localPostEvent(Event event) {
ServiceReference[] refs = getEventHandlerServiceReferences(event);
if (refs == null) {
logWarning("localPostEvent event=" + event
+ ". No service references found to post to.");
return;
}
for (int i = 0; i < refs.length; i++)
fireAsync(refs[i], (EventHandler) context.getService(refs[i]),
event);
}
void handlePostEvent(DistributedEventAdminMessage event) {
localPostEvent(event.getEvent());
}
void handleSendEvent(DistributedEventAdminMessage event) {
localSendEvent(event.getEvent());
}
protected void logWarning(String string) {
System.out.println(string);
}
protected void callSync(final ServiceReference serviceReference,
final EventHandler eventHandler, final Event event) {
SafeRunner.run(new ISafeRunnable() {
public void handleException(Throwable exception) {
logError(
"Exception in EventHandler.handleEvent. eventHandler="
+ eventHandler + ". serviceReference="
+ serviceReference + ". event=" + event,
exception);
}
public void run() throws Exception {
eventHandler.handleEvent(event);
}
});
}
protected void fireAsync(final ServiceReference serviceReference,
final EventHandler eventHandler, final Event event) {
executor.execute(new IProgressRunnable() {
public Object run(IProgressMonitor arg0) throws Exception {
eventHandler.handleEvent(event);
return null;
}
}, null);
}
protected void logError(String string, Throwable e) {
System.err.println(string);
if (e != null)
e.printStackTrace(System.err);
}
}
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