001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.component.vm; 018 019 import java.util.HashMap; 020 import java.util.Map; 021 import java.util.concurrent.BlockingQueue; 022 023 import org.apache.camel.Endpoint; 024 import org.apache.camel.Exchange; 025 import org.apache.camel.component.seda.SedaComponent; 026 import org.apache.camel.component.seda.SedaEndpoint; 027 028 /** 029 * An implementation of the <a href="http://activemq.apache.org/camel/vm.html">VM components</a> 030 * for asynchronous SEDA exchanges on a {@link BlockingQueue} within the classloader tree containing 031 * the camel-core.jar. i.e. to handle communicating across CamelContext instances and possibly across 032 * web application contexts, providing that camel-core.jar is on the system classpath. 033 * 034 * @version $Revision: 1.1 $ 035 */ 036 public class VmComponent<E extends Exchange> extends SedaComponent<E> { 037 protected static Map<String, BlockingQueue<Exchange>> queues = new HashMap<String, BlockingQueue<Exchange>>(); 038 039 @Override 040 protected Endpoint<E> createEndpoint(String uri, String remaining, Map parameters) throws Exception { 041 BlockingQueue<E> blockingQueue = (BlockingQueue<E>) getBlockingQueue(uri); 042 return new SedaEndpoint<E>(uri, this, blockingQueue); 043 } 044 045 protected BlockingQueue<Exchange> getBlockingQueue(String uri) { 046 synchronized (queues) { 047 BlockingQueue<Exchange> answer = queues.get(uri); 048 if (answer == null) { 049 answer = (BlockingQueue<Exchange>) createQueue(); 050 queues.put(uri, answer); 051 } 052 return answer; 053 } 054 } 055 }