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 java.util.concurrent.Future;
020    
021    import org.apache.camel.AsyncCallback;
022    import org.apache.camel.AsyncProcessor;
023    import org.apache.camel.Consumer;
024    import org.apache.camel.Endpoint;
025    import org.apache.camel.Exchange;
026    import org.apache.camel.Processor;
027    import org.apache.camel.impl.converter.AsyncProcessorTypeConverter;
028    import org.apache.camel.spi.ExceptionHandler;
029    import org.apache.camel.util.ServiceHelper;
030    
031    /**
032     * @version $Revision: 36635 $
033     */
034    public class DefaultConsumer<E extends Exchange> extends ServiceSupport implements Consumer<E> {
035        private Endpoint<E> endpoint;
036        private Processor processor;
037        private AsyncProcessor asyncProcessor;
038        private ExceptionHandler exceptionHandler;
039    
040        public DefaultConsumer(Endpoint<E> endpoint, Processor processor) {
041            this.endpoint = endpoint;
042            this.processor = processor;
043        }
044    
045        @Override
046        public String toString() {
047            return "Consumer on " + endpoint;
048        }
049    
050        public Endpoint<E> getEndpoint() {
051            return endpoint;
052        }
053    
054        public Processor getProcessor() {
055            return processor;
056        }
057    
058        /**
059         * Provides an {@link AsyncProcessor} interface to the configured
060         * processor on the consumer.  If the processor does not implement
061         * the interface, it will be adapted so that it does.  
062         */
063        public AsyncProcessor getAsyncProcessor() {
064            if (asyncProcessor == null) {
065                asyncProcessor = AsyncProcessorTypeConverter.convert(processor);
066            }
067            return asyncProcessor;
068        }
069    
070        public ExceptionHandler getExceptionHandler() {
071            if (exceptionHandler == null) {
072                exceptionHandler = new LoggingExceptionHandler(getClass());
073            }
074            return exceptionHandler;
075        }
076    
077        public void setExceptionHandler(ExceptionHandler exceptionHandler) {
078            this.exceptionHandler = exceptionHandler;
079        }
080    
081        protected void doStop() throws Exception {
082            ServiceHelper.stopServices(processor);
083        }
084    
085        protected void doStart() throws Exception {
086            ServiceHelper.startServices(processor);
087        }
088    
089        /**
090         * Handles the given exception using the {@link #getExceptionHandler()}
091         * 
092         * @param t the exception to handle
093         */
094        protected void handleException(Throwable t) {
095            getExceptionHandler().handleException(t);
096        }
097    }