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    
025    /**
026     * A default consumer useful for implementation inheritance.
027     *
028     * @version $Revision: 772076 $
029     */
030    public class DefaultConsumer extends ServiceSupport implements Consumer {
031        private final Endpoint endpoint;
032        private final Processor processor;
033        private ExceptionHandler exceptionHandler;
034    
035        public DefaultConsumer(Endpoint endpoint, Processor processor) {
036            this.endpoint = endpoint;
037            this.processor = processor;
038        }
039    
040        @Override
041        public String toString() {
042            return "Consumer[" + endpoint.getEndpointUri() + "]";
043        }
044    
045        public Endpoint getEndpoint() {
046            return endpoint;
047        }
048    
049        public Processor getProcessor() {
050            return processor;
051        }
052    
053        public ExceptionHandler getExceptionHandler() {
054            if (exceptionHandler == null) {
055                exceptionHandler = new LoggingExceptionHandler(getClass());
056            }
057            return exceptionHandler;
058        }
059    
060        public void setExceptionHandler(ExceptionHandler exceptionHandler) {
061            this.exceptionHandler = exceptionHandler;
062        }
063    
064        protected void doStop() throws Exception {
065            ServiceHelper.stopServices(processor);
066        }
067    
068        protected void doStart() throws Exception {
069            ServiceHelper.startServices(processor);
070        }
071    
072        /**
073         * Handles the given exception using the {@link #getExceptionHandler()}
074         * 
075         * @param t the exception to handle
076         */
077        protected void handleException(Throwable t) {
078            Throwable newt = (t == null) ? new IllegalArgumentException("Handling [null] exception") : t;
079            getExceptionHandler().handleException(newt);
080        }
081    }