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 */ 017package org.apache.camel.processor; 018 019import java.io.ByteArrayOutputStream; 020 021import org.apache.camel.AsyncCallback; 022import org.apache.camel.AsyncProcessor; 023import org.apache.camel.CamelContext; 024import org.apache.camel.CamelContextAware; 025import org.apache.camel.Exchange; 026import org.apache.camel.Message; 027import org.apache.camel.Traceable; 028import org.apache.camel.converter.stream.CachedOutputStream; 029import org.apache.camel.spi.DataFormat; 030import org.apache.camel.support.ServiceSupport; 031import org.apache.camel.util.AsyncProcessorHelper; 032import org.apache.camel.util.ObjectHelper; 033import org.apache.camel.util.ServiceHelper; 034 035/** 036 * Marshals the body of the incoming message using the given 037 * <a href="http://camel.apache.org/data-format.html">data format</a> 038 * 039 * @version 040 */ 041public class MarshalProcessor extends ServiceSupport implements AsyncProcessor, Traceable, CamelContextAware { 042 private CamelContext camelContext; 043 private final DataFormat dataFormat; 044 045 public MarshalProcessor(DataFormat dataFormat) { 046 this.dataFormat = dataFormat; 047 } 048 049 public void process(Exchange exchange) throws Exception { 050 AsyncProcessorHelper.process(this, exchange); 051 } 052 053 public boolean process(Exchange exchange, AsyncCallback callback) { 054 ObjectHelper.notNull(dataFormat, "dataFormat"); 055 056 // if stream caching is enabled then use that so we can stream accordingly 057 // for example to overflow to disk for big streams 058 CachedOutputStream cos; 059 ByteArrayOutputStream os; 060 if (exchange.getContext().getStreamCachingStrategy().isEnabled()) { 061 cos = new CachedOutputStream(exchange); 062 os = null; 063 } else { 064 cos = null; 065 os = new ByteArrayOutputStream(); 066 } 067 068 Message in = exchange.getIn(); 069 Object body = in.getBody(); 070 071 // lets setup the out message before we invoke the dataFormat 072 // so that it can mutate it if necessary 073 Message out = exchange.getOut(); 074 out.copyFrom(in); 075 076 try { 077 if (cos != null) { 078 dataFormat.marshal(exchange, body, cos); 079 out.setBody(cos.newStreamCache()); 080 } else { 081 dataFormat.marshal(exchange, body, os); 082 byte[] data = os.toByteArray(); 083 out.setBody(data); 084 } 085 } catch (Throwable e) { 086 // remove OUT message, as an exception occurred 087 exchange.setOut(null); 088 exchange.setException(e); 089 } 090 091 callback.done(true); 092 return true; 093 } 094 095 @Override 096 public String toString() { 097 return "Marshal[" + dataFormat + "]"; 098 } 099 100 public String getTraceLabel() { 101 return "marshal[" + dataFormat + "]"; 102 } 103 104 public CamelContext getCamelContext() { 105 return camelContext; 106 } 107 108 public void setCamelContext(CamelContext camelContext) { 109 this.camelContext = camelContext; 110 } 111 112 @Override 113 protected void doStart() throws Exception { 114 // inject CamelContext on data format 115 if (dataFormat instanceof CamelContextAware) { 116 ((CamelContextAware) dataFormat).setCamelContext(camelContext); 117 } 118 ServiceHelper.startService(dataFormat); 119 } 120 121 @Override 122 protected void doStop() throws Exception { 123 ServiceHelper.stopService(dataFormat); 124 } 125}