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.TypeConverter; 024 import org.apache.camel.processor.DelegateProcessor; 025 026 /** 027 * A simple converter that can convert any {@link Processor} to an {@link AsyncProcessor}. 028 * Processing will still occur synchronously but it will provide the required 029 * notifications that the caller expects. 030 * 031 * @version $Revision: 1092 $ 032 */ 033 public class AsyncProcessorTypeConverter implements TypeConverter { 034 035 private static final class ProcessorToAsyncProcessorBridge extends DelegateProcessor implements AsyncProcessor { 036 037 private ProcessorToAsyncProcessorBridge(Processor processor) { 038 super(processor); 039 } 040 041 public boolean process(Exchange exchange, AsyncCallback callback) { 042 try { 043 processor.process(exchange); 044 } catch (Throwable e) { 045 exchange.setException(e); 046 } 047 // false means processing of the exchange asynchronously, 048 callback.done(true); 049 return true; 050 } 051 } 052 053 public <T> T convertTo(Class<T> toType, Object value) { 054 if (value != null) { 055 if (toType.equals(AsyncProcessor.class)) { 056 if (value instanceof AsyncProcessor) { 057 return toType.cast(value); 058 } else if (value instanceof Processor) { 059 // Provide an async bridge to the regular processor. 060 final Processor processor = (Processor)value; 061 return toType.cast(new ProcessorToAsyncProcessorBridge(processor)); 062 } 063 } 064 } 065 return null; 066 } 067 068 public <T> T convertTo(Class<T> toType, Exchange exchange, Object value) { 069 return convertTo(toType, value); 070 } 071 072 public static AsyncProcessor convert(Processor value) { 073 if (value instanceof AsyncProcessor) { 074 return (AsyncProcessor)value; 075 } 076 return new ProcessorToAsyncProcessorBridge(value); 077 } 078 }