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 org.apache.camel.Consumer; 020 import org.apache.camel.Endpoint; 021 import org.apache.camel.Processor; 022 import org.apache.camel.spi.ExceptionHandler; 023 import org.apache.camel.util.ServiceHelper; 024 import org.apache.commons.logging.Log; 025 import org.apache.commons.logging.LogFactory; 026 027 /** 028 * A default consumer useful for implementation inheritance. 029 * 030 * @version $Revision: 789087 $ 031 */ 032 public class DefaultConsumer extends ServiceSupport implements Consumer { 033 private final transient Log log = LogFactory.getLog(getClass()); 034 private final Endpoint endpoint; 035 private final Processor processor; 036 private ExceptionHandler exceptionHandler; 037 038 public DefaultConsumer(Endpoint endpoint, Processor processor) { 039 this.endpoint = endpoint; 040 this.processor = processor; 041 } 042 043 @Override 044 public String toString() { 045 return "Consumer[" + endpoint.getEndpointUri() + "]"; 046 } 047 048 public Endpoint getEndpoint() { 049 return endpoint; 050 } 051 052 public Processor getProcessor() { 053 return processor; 054 } 055 056 public ExceptionHandler getExceptionHandler() { 057 if (exceptionHandler == null) { 058 exceptionHandler = new LoggingExceptionHandler(getClass()); 059 } 060 return exceptionHandler; 061 } 062 063 public void setExceptionHandler(ExceptionHandler exceptionHandler) { 064 this.exceptionHandler = exceptionHandler; 065 } 066 067 protected void doStop() throws Exception { 068 if (log.isDebugEnabled()) { 069 log.debug("Stopping consumer: " + this); 070 } 071 ServiceHelper.stopServices(processor); 072 } 073 074 protected void doStart() throws Exception { 075 if (log.isDebugEnabled()) { 076 log.debug("Starting consumer: " + this); 077 } 078 ServiceHelper.startServices(processor); 079 } 080 081 /** 082 * Handles the given exception using the {@link #getExceptionHandler()} 083 * 084 * @param t the exception to handle 085 */ 086 protected void handleException(Throwable t) { 087 Throwable newt = (t == null) ? new IllegalArgumentException("Handling [null] exception") : t; 088 getExceptionHandler().handleException(newt); 089 } 090 }