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.AsyncProcessor; 020 import org.apache.camel.Consumer; 021 import org.apache.camel.Endpoint; 022 import org.apache.camel.Exchange; 023 import org.apache.camel.Processor; 024 import org.apache.camel.impl.converter.AsyncProcessorTypeConverter; 025 import org.apache.camel.spi.ExceptionHandler; 026 import org.apache.camel.util.ServiceHelper; 027 028 /** 029 * A default consumer useful for implementation inheritance. 030 * 031 * @version $Revision: 1055 $ 032 */ 033 public class DefaultConsumer<E extends Exchange> extends ServiceSupport implements Consumer<E> { 034 private Endpoint<E> endpoint; 035 private Processor processor; 036 private AsyncProcessor asyncProcessor; 037 private ExceptionHandler exceptionHandler; 038 039 public DefaultConsumer(Endpoint<E> endpoint, Processor processor) { 040 this.endpoint = endpoint; 041 this.processor = processor; 042 } 043 044 @Override 045 public String toString() { 046 return "Consumer on " + endpoint; 047 } 048 049 public Endpoint<E> getEndpoint() { 050 return endpoint; 051 } 052 053 public Processor getProcessor() { 054 return processor; 055 } 056 057 /** 058 * Provides an {@link AsyncProcessor} interface to the configured 059 * processor on the consumer. If the processor does not implement 060 * the interface, it will be adapted so that it does. 061 */ 062 public AsyncProcessor getAsyncProcessor() { 063 if (asyncProcessor == null) { 064 asyncProcessor = AsyncProcessorTypeConverter.convert(processor); 065 } 066 return asyncProcessor; 067 } 068 069 public ExceptionHandler getExceptionHandler() { 070 if (exceptionHandler == null) { 071 exceptionHandler = new LoggingExceptionHandler(getClass()); 072 } 073 return exceptionHandler; 074 } 075 076 public void setExceptionHandler(ExceptionHandler exceptionHandler) { 077 this.exceptionHandler = exceptionHandler; 078 } 079 080 protected void doStop() throws Exception { 081 ServiceHelper.stopServices(processor); 082 } 083 084 protected void doStart() throws Exception { 085 ServiceHelper.startServices(processor); 086 } 087 088 /** 089 * Handles the given exception using the {@link #getExceptionHandler()} 090 * 091 * @param t the exception to handle 092 */ 093 protected void handleException(Throwable t) { 094 Throwable newt = (t == null) ? new Throwable("Handling [null] exception") : t; 095 getExceptionHandler().handleException(newt); 096 } 097 }