/**
* 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.camel.component.vm;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.component.seda.SedaComponent;
import org.apache.camel.component.seda.SedaEndpoint;
/**
* An implementation of the <a href="http://camel.apache.org/vm.html">VM components</a>
* for asynchronous SEDA exchanges on a {@link BlockingQueue} within the classloader tree containing
* the camel-core.jar. i.e. to handle communicating across CamelContext instances and possibly across
* web application contexts, providing that camel-core.jar is on the system classpath.
*
* @version $Revision: 780267 $
*/
public class VmComponent extends SedaComponent {
protected static final Map<String, BlockingQueue> QUEUES = new HashMap<String, BlockingQueue>();
private static final AtomicInteger START_COUNTER = new AtomicInteger();
@Override
protected Endpoint createEndpoint(String uri, String remaining, Map parameters) throws Exception {
BlockingQueue<Exchange> blockingQueue = getBlockingQueue(uri, parameters);
SedaEndpoint answer = new SedaEndpoint(uri, this, blockingQueue);
answer.configureProperties(parameters);
return answer;
}
@SuppressWarnings("unchecked")
protected BlockingQueue<Exchange> getBlockingQueue(String uri, Map parameters) {
synchronized (QUEUES) {
BlockingQueue<Exchange> answer = QUEUES.get(uri);
if (answer == null) {
answer = createQueue(uri, parameters);
QUEUES.put(uri, answer);
}
return answer;
}
}
@Override
protected void doStart() throws Exception {
super.doStart();
START_COUNTER.incrementAndGet();
}
@Override
protected void doStop() throws Exception {
super.doStop();
if (START_COUNTER.decrementAndGet() == 0) {
synchronized (QUEUES) {
for (BlockingQueue q : QUEUES.values()) {
q.clear();
}
QUEUES.clear();
}
}
}
}