| /** |
| * 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.LinkedBlockingQueue; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.component.seda.SedaComponent; |
| |
| /** |
| * 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, BlockingQueue<Exchange>> QUEUES = new HashMap<String, BlockingQueue<Exchange>>(); |
| private static final AtomicInteger START_COUNTER = new AtomicInteger(); |
| |
| @Override |
| public synchronized BlockingQueue<Exchange> createQueue(String uri, Map<String, Object> parameters) { |
| String key = getQueueKey(uri); |
| |
| if (QUEUES.containsKey(key)) { |
| return QUEUES.get(key); |
| } |
| |
| // create queue |
| BlockingQueue<Exchange> queue; |
| Integer size = getAndRemoveParameter(parameters, "size", Integer.class); |
| if (size != null && size > 0) { |
| queue = new LinkedBlockingQueue<Exchange>(size); |
| } else { |
| queue = new LinkedBlockingQueue<Exchange>(); |
| } |
| |
| QUEUES.put(key, queue); |
| return queue; |
| } |
| |
| @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<Exchange> q : QUEUES.values()) { |
| q.clear(); |
| } |
| QUEUES.clear(); |
| } |
| } |
| } |
| } |