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 "DelegateAsync(" + 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 }