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.converter;
018    
019    import org.apache.camel.AsyncCallback;
020    import org.apache.camel.AsyncProcessor;
021    import org.apache.camel.Converter;
022    import org.apache.camel.Exchange;
023    import org.apache.camel.Processor;
024    import org.apache.camel.processor.DelegateProcessor;
025    
026    /**
027     * @version $Revision: 834834 $
028     */
029    @Converter
030    public final class AsyncProcessorConverter {
031    
032        private AsyncProcessorConverter() {
033            // Utility class
034        }
035    
036        private static final class ProcessorToAsyncProcessorBridge extends DelegateProcessor implements AsyncProcessor {
037    
038            private ProcessorToAsyncProcessorBridge(Processor processor) {
039                super(processor);
040            }
041    
042            public void process(Exchange exchange, AsyncCallback callback) throws Exception {
043                try {
044                    processor.process(exchange);
045                } catch (Exception e) {
046                    exchange.setException(e);
047                }
048                callback.onTaskCompleted(exchange);
049            }
050        }
051    
052        @Converter
053        public static AsyncProcessor toAsyncProcessor(final Processor processor) {
054            if (processor instanceof AsyncProcessor) {
055                return (AsyncProcessor) processor;
056            } else {
057                return new ProcessorToAsyncProcessorBridge(processor);
058            }
059        }
060    
061    }