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.Processor;
023    import org.apache.camel.Service;
024    import org.apache.camel.impl.ServiceSupport;
025    import org.apache.camel.spi.Policy;
026    import org.apache.camel.util.AsyncProcessorHelper;
027    import org.apache.camel.util.ServiceHelper;
028    
029    /**
030     * A Delegate pattern which delegates processing to a nested AsyncProcessor which can
031     * be useful for implementation inheritance when writing an {@link Policy}
032     */
033    public class DelegateAsyncProcessor extends ServiceSupport implements AsyncProcessor {
034        protected AsyncProcessor processor;
035    
036        public DelegateAsyncProcessor() {
037        }
038        public DelegateAsyncProcessor(AsyncProcessor processor) {
039            this.processor = processor;
040        }
041    
042        @Override
043        public String toString() {
044            return "Delegate(" + processor + ")";
045        }
046    
047        public AsyncProcessor getProcessor() {
048            return processor;
049        }
050    
051        public void setProcessor(AsyncProcessor processor) {
052            this.processor = processor;
053        }
054    
055        protected void doStart() throws Exception {
056            ServiceHelper.startServices(processor);
057        }
058    
059        protected void doStop() throws Exception {
060            ServiceHelper.stopServices(processor);
061        }
062    
063        public boolean process(final Exchange exchange, final AsyncCallback callback) {
064            return processor.process(exchange, callback);
065        }
066    
067        public void process(Exchange exchange) throws Exception {
068            AsyncProcessorHelper.process(this, exchange);
069        }
070    
071    }