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.impl; 018 019 import java.util.HashMap; 020 import java.util.Map; 021 022 import org.apache.camel.Endpoint; 023 import org.apache.camel.Exchange; 024 import org.apache.camel.FailedToCreateConsumerException; 025 import org.apache.camel.IsSingleton; 026 import org.apache.camel.PollingConsumer; 027 import org.apache.camel.util.ServiceHelper; 028 import org.apache.commons.logging.Log; 029 import org.apache.commons.logging.LogFactory; 030 031 /** 032 * Cache containing created {@link org.apache.camel.Consumer}. 033 * 034 * @version $Revision: 778782 $ 035 */ 036 public class ConsumerCache extends ServiceSupport { 037 private static final transient Log LOG = LogFactory.getLog(ConsumerCache.class); 038 039 private final Map<String, PollingConsumer> consumers = new HashMap<String, PollingConsumer>(); 040 041 public synchronized PollingConsumer getConsumer(Endpoint endpoint) { 042 String key = endpoint.getEndpointUri(); 043 PollingConsumer answer = consumers.get(key); 044 if (answer == null) { 045 try { 046 answer = endpoint.createPollingConsumer(); 047 answer.start(); 048 } catch (Exception e) { 049 throw new FailedToCreateConsumerException(endpoint, e); 050 } 051 052 boolean singleton = true; 053 if (answer instanceof IsSingleton) { 054 singleton = ((IsSingleton)answer).isSingleton(); 055 } 056 057 if (singleton) { 058 if (LOG.isDebugEnabled()) { 059 LOG.debug("Adding to consumer cache with key: " + endpoint + " for consumer: " + answer); 060 } 061 consumers.put(key, answer); 062 } else { 063 if (LOG.isDebugEnabled()) { 064 LOG.debug("Consumer for endpoint: " + key + " is not singleton and thus not added to producer cache"); 065 } 066 } 067 } 068 return answer; 069 } 070 071 public Exchange receive(Endpoint endpoint) { 072 if (LOG.isDebugEnabled()) { 073 LOG.debug("<<<< " + endpoint); 074 } 075 076 PollingConsumer consumer = getConsumer(endpoint); 077 return consumer.receive(); 078 } 079 080 public Exchange receive(Endpoint endpoint, long timeout) { 081 if (LOG.isDebugEnabled()) { 082 LOG.debug("<<<< " + endpoint); 083 } 084 085 PollingConsumer consumer = getConsumer(endpoint); 086 return consumer.receive(timeout); 087 } 088 089 public Exchange receiveNoWait(Endpoint endpoint) { 090 if (LOG.isDebugEnabled()) { 091 LOG.debug("<<<< " + endpoint); 092 } 093 094 PollingConsumer consumer = getConsumer(endpoint); 095 return consumer.receiveNoWait(); 096 } 097 098 protected void doStop() throws Exception { 099 ServiceHelper.stopServices(consumers.values()); 100 consumers.clear(); 101 } 102 103 protected void doStart() throws Exception { 104 } 105 106 }