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.processor; 018 019 import java.util.ArrayList; 020 import java.util.List; 021 022 import org.apache.camel.AsyncCallback; 023 import org.apache.camel.AsyncProcessor; 024 import org.apache.camel.DelegateProcessor; 025 import org.apache.camel.Exchange; 026 import org.apache.camel.Navigate; 027 import org.apache.camel.Processor; 028 import org.apache.camel.support.ServiceSupport; 029 import org.apache.camel.util.AsyncProcessorConverterHelper; 030 import org.apache.camel.util.AsyncProcessorHelper; 031 import org.apache.camel.util.ServiceHelper; 032 033 /** 034 * A Delegate pattern which delegates processing to a nested {@link AsyncProcessor} which can 035 * be useful for implementation inheritance when writing an {@link org.apache.camel.spi.Policy} 036 * <p/> 037 * <b>Important:</b> This implementation <b>does</b> support the asynchronous routing engine. 038 * If you are implementing a EIP pattern please use this as the delegate. 039 * 040 * @version 041 * @see org.apache.camel.processor.DelegateProcessor 042 */ 043 public class DelegateAsyncProcessor extends ServiceSupport implements DelegateProcessor, AsyncProcessor, Navigate<Processor> { 044 protected AsyncProcessor processor; 045 046 public DelegateAsyncProcessor() { 047 } 048 049 public DelegateAsyncProcessor(AsyncProcessor processor) { 050 if (processor == this) { 051 throw new IllegalArgumentException("Recursive DelegateAsyncProcessor!"); 052 } 053 this.processor = processor; 054 } 055 056 public DelegateAsyncProcessor(Processor processor) { 057 this(AsyncProcessorConverterHelper.convert(processor)); 058 } 059 060 @Override 061 public String toString() { 062 return "DelegateAsync[" + processor + "]"; 063 } 064 065 public AsyncProcessor getProcessor() { 066 return processor; 067 } 068 069 public void setProcessor(AsyncProcessor processor) { 070 this.processor = processor; 071 } 072 073 public void setProcessor(Processor processor) { 074 this.processor = AsyncProcessorConverterHelper.convert(processor); 075 } 076 077 protected void doStart() throws Exception { 078 ServiceHelper.startServices(processor); 079 } 080 081 protected void doStop() throws Exception { 082 ServiceHelper.stopServices(processor); 083 } 084 085 public void process(Exchange exchange) throws Exception { 086 AsyncProcessorHelper.process(this, exchange); 087 } 088 089 public boolean process(final Exchange exchange, final AsyncCallback callback) { 090 return processNext(exchange, callback); 091 } 092 093 protected boolean processNext(Exchange exchange, AsyncCallback callback) { 094 if (processor == null) { 095 // no processor then we are done 096 callback.done(true); 097 return true; 098 } 099 return AsyncProcessorHelper.process(processor, exchange, callback); 100 } 101 102 public boolean hasNext() { 103 return processor != null; 104 } 105 106 public List<Processor> next() { 107 if (!hasNext()) { 108 return null; 109 } 110 List<Processor> answer = new ArrayList<Processor>(1); 111 answer.add(processor); 112 return answer; 113 } 114 115 }