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 org.apache.camel.AsyncCallback; 020 import org.apache.camel.AsyncProcessor; 021 import org.apache.camel.Exchange; 022 import org.apache.camel.impl.ServiceSupport; 023 import org.apache.camel.spi.Policy; 024 import org.apache.camel.util.AsyncProcessorHelper; 025 import org.apache.camel.util.ServiceHelper; 026 027 /** 028 * A Delegate pattern which delegates processing to a nested AsyncProcessor which can 029 * be useful for implementation inheritance when writing an {@link Policy} 030 */ 031 public class DelegateAsyncProcessor extends ServiceSupport implements AsyncProcessor { 032 protected AsyncProcessor processor; 033 034 public DelegateAsyncProcessor() { 035 } 036 public DelegateAsyncProcessor(AsyncProcessor processor) { 037 this.processor = processor; 038 } 039 040 @Override 041 public String toString() { 042 return "Delegate(" + processor + ")"; 043 } 044 045 public AsyncProcessor getProcessor() { 046 return processor; 047 } 048 049 public void setProcessor(AsyncProcessor processor) { 050 this.processor = processor; 051 } 052 053 protected void doStart() throws Exception { 054 ServiceHelper.startServices(processor); 055 } 056 057 protected void doStop() throws Exception { 058 ServiceHelper.stopServices(processor); 059 } 060 061 public boolean process(final Exchange exchange, final AsyncCallback callback) { 062 return processor.process(exchange, callback); 063 } 064 065 public void process(Exchange exchange) throws Exception { 066 AsyncProcessorHelper.process(this, exchange); 067 } 068 069 }