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/*******************************************************************************
* Copyright (c) 2009, 2012 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.e4.ui.services.internal.events;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Dictionary;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.core.services.log.Logger;
import org.eclipse.e4.ui.di.UISynchronize;
import org.eclipse.e4.ui.internal.services.Activator;
import org.eclipse.e4.ui.internal.services.ServiceMessages;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
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;
public class EventBroker implements IEventBroker {
// TBD synchronization
private Map<EventHandler, Collection<ServiceRegistration<?>>> registrations = new HashMap<EventHandler, Collection<ServiceRegistration<?>>>();
@Inject
Logger logger;
@Inject
@Optional
UISynchronize uiSync;
// This is a temporary code to ensure that bundle containing
// EventAdmin implementation is started. This code it to be removed once
// the proper method to start EventAdmin is added.
static {
EventAdmin eventAdmin = Activator.getDefault().getEventAdmin();
if (eventAdmin == null) {
Bundle[] bundles = Activator.getDefault().getBundleContext().getBundles();
for (Bundle bundle : bundles) {
if (!"org.eclipse.equinox.event".equals(bundle.getSymbolicName()))
continue;
try {
bundle.start(Bundle.START_TRANSIENT);
} catch (BundleException e) {
e.printStackTrace();
}
break;
}
}
}
public EventBroker() {
// placeholder
}
@Override
public boolean send(String topic, Object data) {
Event event = constructEvent(topic, data);
EventAdmin eventAdmin = Activator.getDefault().getEventAdmin();
if (eventAdmin == null) {
logger.error(NLS.bind(ServiceMessages.NO_EVENT_ADMIN, event.toString()));
return false;
}
eventAdmin.sendEvent(event);
return true;
}
@Override
public boolean post(String topic, Object data) {
Event event = constructEvent(topic, data);
EventAdmin eventAdmin = Activator.getDefault().getEventAdmin();
if (eventAdmin == null) {
logger.error(NLS.bind(ServiceMessages.NO_EVENT_ADMIN, event.toString()));
return false;
}
eventAdmin.postEvent(event);
return true;
}
@SuppressWarnings("unchecked")
private Event constructEvent(String topic, Object data) {
Event event;
if (data instanceof Dictionary<?,?>) {
event = new Event(topic, (Dictionary<String,?>)data);
} else if (data instanceof Map<?,?>) {
event = new Event(topic, (Map<String,?>)data);
} else {
Dictionary<String, Object> d = new Hashtable<String, Object>(2);
d.put(EventConstants.EVENT_TOPIC, topic);
if (data != null)
d.put(IEventBroker.DATA, data);
event = new Event(topic, d);
}
return event;
}
@Override
public boolean subscribe(String topic, EventHandler eventHandler) {
return subscribe(topic, null, eventHandler, false);
}
@Override
public boolean subscribe(String topic, String filter, EventHandler eventHandler, boolean headless) {
BundleContext bundleContext = Activator.getDefault().getBundleContext();
if (bundleContext == null) {
logger.error(NLS.bind(ServiceMessages.NO_BUNDLE_CONTEXT, topic));
return false;
}
String[] topics = new String[] {topic};
Dictionary<String, Object> d = new Hashtable<String, Object>();
d.put(EventConstants.EVENT_TOPIC, topics);
if (filter != null)
d.put(EventConstants.EVENT_FILTER, filter);
EventHandler wrappedHandler = new UIEventHandler(eventHandler, headless ? null : uiSync);
ServiceRegistration<?> registration = bundleContext.registerService(
EventHandler.class.getName(), wrappedHandler, d);
Collection<ServiceRegistration<?>> handled = registrations
.get(eventHandler);
if (handled == null) {
registrations.put(eventHandler,
handled = new ArrayList<ServiceRegistration<?>>());
}
handled.add(registration);
return true;
}
@Override
public boolean unsubscribe(EventHandler eventHandler) {
Collection<ServiceRegistration<?>> handled = registrations
.remove(eventHandler);
if (handled == null || handled.isEmpty())
return false;
for (ServiceRegistration<?> r : handled) {
r.unregister();
}
return true;
}
@PreDestroy
void dispose() {
Collection<Collection<ServiceRegistration<?>>> values = new ArrayList<Collection<ServiceRegistration<?>>>(
registrations.values());
registrations.clear();
for (Collection<ServiceRegistration<?>> handled : values) {
for (ServiceRegistration<?> registration : handled) {
// System.out.println("EventBroker dispose:" + registration[i] +
// ")");
registration.unregister();
}
}
}
}
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