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.impl.converter; 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.TypeConverter; 025 import org.apache.camel.processor.DelegateProcessor; 026 027 /** 028 * A simple converter that can convert any Processor to an AsyncProcessor. 029 * Processing will still occur synchronously but it will provide the required 030 * notifications that the caller expects. 031 * 032 * @version $Revision: 21640 $ 033 */ 034 public class AsyncProcessorTypeConverter implements TypeConverter { 035 036 public static final class ProcessorToAsynProcessorBridge extends DelegateProcessor implements AsyncProcessor { 037 038 private ProcessorToAsynProcessorBridge(Processor processor) { 039 super(processor); 040 } 041 042 public boolean process(Exchange exchange, AsyncCallback callback) { 043 try { 044 processor.process(exchange); 045 } catch (Throwable e) { 046 exchange.setException(e); 047 } 048 // false means processing of the exchange asynchronously, 049 callback.done(true); 050 return true; 051 } 052 } 053 054 public <T> T convertTo(Class<T> toType, Object value) { 055 if (value != null) { 056 if (toType.equals(AsyncProcessor.class)) { 057 if (value instanceof AsyncProcessor) { 058 return toType.cast(value); 059 } else if (value instanceof Processor) { 060 // Provide an async bridge to the regular processor. 061 final Processor processor = (Processor)value; 062 return toType.cast(new ProcessorToAsynProcessorBridge(processor)); 063 } 064 } 065 } 066 return null; 067 } 068 069 public static AsyncProcessor convert(Processor value) { 070 if (value instanceof AsyncProcessor) { 071 return (AsyncProcessor)value; 072 } 073 return new ProcessorToAsynProcessorBridge(value); 074 } 075 }