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.Map;
020
021 import org.apache.camel.Endpoint;
022 import org.apache.camel.Exchange;
023 import org.apache.camel.FailedToCreateConsumerException;
024 import org.apache.camel.IsSingleton;
025 import org.apache.camel.PollingConsumer;
026 import org.apache.camel.util.LRUCache;
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: 789593 $
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;
040
041 public ConsumerCache() {
042 this.consumers = new LRUCache<String, PollingConsumer>(1000);
043 }
044
045 public ConsumerCache(Map<String, PollingConsumer> cache) {
046 this.consumers = cache;
047 }
048
049 public synchronized PollingConsumer getConsumer(Endpoint endpoint) {
050 String key = endpoint.getEndpointUri();
051 PollingConsumer answer = consumers.get(key);
052 if (answer == null) {
053 try {
054 answer = endpoint.createPollingConsumer();
055 answer.start();
056 } catch (Exception e) {
057 throw new FailedToCreateConsumerException(endpoint, e);
058 }
059
060 boolean singleton = true;
061 if (answer instanceof IsSingleton) {
062 singleton = ((IsSingleton)answer).isSingleton();
063 }
064
065 if (singleton) {
066 if (LOG.isDebugEnabled()) {
067 LOG.debug("Adding to consumer cache with key: " + endpoint + " for consumer: " + answer);
068 }
069 consumers.put(key, answer);
070 } else {
071 if (LOG.isDebugEnabled()) {
072 LOG.debug("Consumer for endpoint: " + key + " is not singleton and thus not added to consumer cache");
073 }
074 }
075 }
076 return answer;
077 }
078
079 public Exchange receive(Endpoint endpoint) {
080 if (LOG.isDebugEnabled()) {
081 LOG.debug("<<<< " + endpoint);
082 }
083
084 PollingConsumer consumer = getConsumer(endpoint);
085 return consumer.receive();
086 }
087
088 public Exchange receive(Endpoint endpoint, long timeout) {
089 if (LOG.isDebugEnabled()) {
090 LOG.debug("<<<< " + endpoint);
091 }
092
093 PollingConsumer consumer = getConsumer(endpoint);
094 return consumer.receive(timeout);
095 }
096
097 public Exchange receiveNoWait(Endpoint endpoint) {
098 if (LOG.isDebugEnabled()) {
099 LOG.debug("<<<< " + endpoint);
100 }
101
102 PollingConsumer consumer = getConsumer(endpoint);
103 return consumer.receiveNoWait();
104 }
105
106 protected void doStop() throws Exception {
107 ServiceHelper.stopServices(consumers.values());
108 consumers.clear();
109 }
110
111 protected void doStart() throws Exception {
112 }
113
114 /**
115 * Returns the current size of the consumer cache
116 *
117 * @return the current size
118 */
119 int size() {
120 return consumers.size();
121 }
122
123 }