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    }