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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* 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:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.event.osgi.internal;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import org.eclipse.osee.event.EventHandler;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
/**
* @author Roberto E. Escobar
*/
public class EventHandlerConsumer {
private final Map<EventHandler, ServiceRegistration<?>> registered =
new ConcurrentHashMap<EventHandler, ServiceRegistration<?>>();
private final Map<EventHandler, Dictionary<String, ?>> pending =
new ConcurrentHashMap<EventHandler, Dictionary<String, ?>>();
private BundleContext context;
private Thread thread;
public void start(BundleContext context) {
this.context = context;
this.thread = new Thread("Register Pending Event Handlers") {
@Override
public void run() {
for (Entry<EventHandler, Dictionary<String, ?>> entry : pending.entrySet()) {
registerHelper(entry.getKey(), entry.getValue());
}
pending.clear();
}
};
thread.start();
}
public void stop() {
if (thread != null && thread.isAlive()) {
thread.interrupt();
}
this.context = null;
}
private boolean isReady() {
return context != null;
}
public void registerHandler(EventHandler handler, Map<String, ?> properties) {
Hashtable<String, Object> serviceProps = new Hashtable<String, Object>();
serviceProps.putAll(properties);
if (isReady()) {
registerHelper(handler, serviceProps);
} else {
pending.put(handler, serviceProps);
}
}
public void unregisterHandler(EventHandler handler, Map<String, ?> properties) {
if (isReady()) {
ServiceRegistration<?> registration = registered.remove(handler);
if (registration != null) {
registration.unregister();
}
} else {
pending.remove(handler);
}
}
private void registerHelper(EventHandler handler, Dictionary<String, ?> serviceProps) {
try {
EventHandlerProxy proxy = new EventHandlerProxy(handler);
ServiceRegistration<?> registration =
context.registerService(org.osgi.service.event.EventHandler.class, proxy, serviceProps);
registered.put(handler, registration);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
}
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