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 }