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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.sample.comet;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.tuscany.sca.binding.comet.runtime.callback.CometCallback;
import org.apache.tuscany.sca.binding.comet.runtime.callback.Status;
import org.oasisopen.sca.ComponentContext;
import org.oasisopen.sca.annotation.Context;
import org.oasisopen.sca.annotation.Destroy;
import org.oasisopen.sca.annotation.Scope;
import org.oasisopen.sca.annotation.Service;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
@Service({ EventProcessorConsumerService.class, EventProcessorProducerService.class })
@Scope("COMPOSITE")
public class EventProcessor implements EventProcessorConsumerService, EventProcessorProducerService {
@Context
protected ComponentContext componentContext;
private ConcurrentMap<String, CometCallback> clients = new ConcurrentHashMap<String, CometCallback>();
private Multimap<String, String> eventListeners = Multimaps.synchronizedMultimap(HashMultimap
.<String, String> create());
@Override
public void onEvent(String eventName, String eventData) {
// System.out.println("EventProcessor: Received event " + eventName +
// "...");
List<String> destinations = new ArrayList<String>();
synchronized (eventListeners) {
destinations.addAll(eventListeners.get(eventName));
}
Event event = new Event();
event.setName(eventName);
event.setData(eventData);
for (String registrationId : destinations) {
CometCallback client = clients.get(registrationId);
if (client == null) {
// client has unregistered from this event
synchronized (eventListeners) {
eventListeners.remove(eventName, registrationId);
}
} else {
Status status = client.sendMessage(event);
if (status == Status.CLIENT_DISCONNECTED) {
unregister(registrationId);
}
}
}
}
@Override
public void register(String eventName) {
String registrationId = UUID.randomUUID().toString();
CometCallback callback = componentContext.getRequestContext().getCallback();
clients.put(registrationId, callback);
synchronized (eventListeners) {
eventListeners.put(eventName, registrationId);
}
Event event = new Event();
event.setId(registrationId);
event.setName(eventName);
event.setData(new Date().toString());
callback.sendMessage(event);
}
@Override
public void unregister(String registrationId) {
clients.remove(registrationId);
// unregistration from eventListeners done during onEvent
}
@Destroy
public void shutdown() {
clients.clear();
eventListeners.clear();
clients = null;
eventListeners = null;
}
}
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