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