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 */ 017package org.apache.camel.impl; 018 019import org.apache.camel.CamelContext; 020import org.apache.camel.Endpoint; 021import org.apache.camel.FailedToCreateConsumerException; 022import org.apache.camel.IsSingleton; 023import org.apache.camel.PollingConsumer; 024import org.apache.camel.util.ObjectHelper; 025import org.apache.camel.util.ServiceHelper; 026 027/** 028 * A {@link ConsumerCache} which is always empty and does not cache any {@link org.apache.camel.Consumer}s. 029 */ 030public class EmptyConsumerCache extends ConsumerCache { 031 032 public EmptyConsumerCache(Object source, CamelContext camelContext) { 033 super(source, camelContext, 0); 034 } 035 036 @Override 037 public PollingConsumer acquirePollingConsumer(Endpoint endpoint) { 038 // always create a new consumer 039 PollingConsumer answer; 040 try { 041 answer = endpoint.createPollingConsumer(); 042 boolean singleton = true; 043 if (answer instanceof IsSingleton) { 044 singleton = ((IsSingleton) answer).isSingleton(); 045 } 046 if (getCamelContext().isStartingRoutes() && singleton) { 047 // if we are currently starting a route, then add as service and enlist in JMX 048 // - but do not enlist non-singletons in JMX 049 // - note addService will also start the service 050 getCamelContext().addService(answer); 051 } else { 052 // must then start service so producer is ready to be used 053 ServiceHelper.startService(answer); 054 } 055 } catch (Exception e) { 056 throw new FailedToCreateConsumerException(endpoint, e); 057 } 058 return answer; 059 } 060 061 @Override 062 public void releasePollingConsumer(Endpoint endpoint, PollingConsumer pollingConsumer) { 063 // stop and shutdown the consumer as its not cache or reused 064 try { 065 ServiceHelper.stopAndShutdownService(pollingConsumer); 066 } catch (Exception e) { 067 throw ObjectHelper.wrapRuntimeCamelException(e); 068 } 069 } 070 071 @Override 072 public String toString() { 073 return "EmptyConsumerCache for source: " + getSource(); 074 } 075 076}