| /** |
| * 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.impl; |
| |
| import java.util.Map; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Endpoint; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.FailedToCreateConsumerException; |
| import org.apache.camel.IsSingleton; |
| import org.apache.camel.PollingConsumer; |
| import org.apache.camel.util.CamelContextHelper; |
| import org.apache.camel.util.LRUCache; |
| import org.apache.camel.util.ServiceHelper; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Cache containing created {@link org.apache.camel.Consumer}. |
| * |
| * @version $Revision$ |
| */ |
| public class ConsumerCache extends ServiceSupport { |
| private static final transient Log LOG = LogFactory.getLog(ConsumerCache.class); |
| private final CamelContext camelContext; |
| private final Map<String, PollingConsumer> consumers; |
| |
| public ConsumerCache(CamelContext camelContext) { |
| this(camelContext, CamelContextHelper.getMaximumCachePoolSize(camelContext)); |
| } |
| |
| public ConsumerCache(CamelContext camelContext, int maximumCacheSize) { |
| this(camelContext, new LRUCache<String, PollingConsumer>(maximumCacheSize)); |
| } |
| |
| public ConsumerCache(CamelContext camelContext, Map<String, PollingConsumer> cache) { |
| this.camelContext = camelContext; |
| this.consumers = cache; |
| } |
| |
| public synchronized PollingConsumer getConsumer(Endpoint endpoint) { |
| String key = endpoint.getEndpointUri(); |
| PollingConsumer answer = consumers.get(key); |
| if (answer == null) { |
| try { |
| answer = endpoint.createPollingConsumer(); |
| answer.start(); |
| } catch (Exception e) { |
| throw new FailedToCreateConsumerException(endpoint, e); |
| } |
| |
| boolean singleton = true; |
| if (answer instanceof IsSingleton) { |
| singleton = ((IsSingleton) answer).isSingleton(); |
| } |
| |
| if (singleton) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Adding to consumer cache with key: " + endpoint + " for consumer: " + answer); |
| } |
| consumers.put(key, answer); |
| } else { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Consumer for endpoint: " + key + " is not singleton and thus not added to consumer cache"); |
| } |
| } |
| } |
| return answer; |
| } |
| |
| public Exchange receive(Endpoint endpoint) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<<<< " + endpoint); |
| } |
| |
| PollingConsumer consumer = getConsumer(endpoint); |
| return consumer.receive(); |
| } |
| |
| public Exchange receive(Endpoint endpoint, long timeout) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<<<< " + endpoint); |
| } |
| |
| PollingConsumer consumer = getConsumer(endpoint); |
| return consumer.receive(timeout); |
| } |
| |
| public Exchange receiveNoWait(Endpoint endpoint) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("<<<< " + endpoint); |
| } |
| |
| PollingConsumer consumer = getConsumer(endpoint); |
| return consumer.receiveNoWait(); |
| } |
| |
| public CamelContext getCamelContext() { |
| return camelContext; |
| } |
| |
| protected void doStart() throws Exception { |
| ServiceHelper.startServices(consumers); |
| } |
| |
| protected void doStop() throws Exception { |
| ServiceHelper.stopServices(consumers); |
| consumers.clear(); |
| } |
| |
| /** |
| * Returns the current size of the consumer cache |
| * |
| * @return the current size |
| */ |
| int size() { |
| return consumers.size(); |
| } |
| |
| } |