/**
* 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.component.seda.QueueReference;
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
*/
public class VmComponent extends SedaComponent {
protected static final Map<String, QueueReference> QUEUES = new HashMap<String, QueueReference>();
protected static final Map<String, SedaEndpoint> ENDPOINTS = new HashMap<String, SedaEndpoint>();
private static final AtomicInteger START_COUNTER = new AtomicInteger();
@Override
public Map<String, QueueReference> getQueues() {
return QUEUES;
}
@Override
public QueueReference getQueueReference(String key) {
return QUEUES.get(key);
}
@Override
protected void doStart() throws Exception {
super.doStart();
START_COUNTER.incrementAndGet();
}
@Override
protected void doStop() throws Exception {
if (START_COUNTER.decrementAndGet() <= 0) {
// clear queues when no more vm components in use
getQueues().clear();
// also clear endpoints
ENDPOINTS.clear();
}
}
@Override
@SuppressWarnings("unchecked")
protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception {
if (ENDPOINTS.containsKey(uri)) {
return ENDPOINTS.get(uri);
}
SedaEndpoint answer = (SedaEndpoint) super.createEndpoint(uri, remaining, parameters);
ENDPOINTS.put(uri, answer);
return answer;
}
}