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 org.apache.camel.AsyncCallback; 020import org.apache.camel.AsyncProcessor; 021import org.apache.camel.CamelContext; 022import org.apache.camel.CamelContextAware; 023import org.apache.camel.Exchange; 024import org.apache.camel.Message; 025import org.apache.camel.Traceable; 026import org.apache.camel.converter.stream.OutputStreamBuilder; 027import org.apache.camel.spi.DataFormat; 028import org.apache.camel.spi.IdAware; 029import org.apache.camel.support.ServiceSupport; 030import org.apache.camel.util.AsyncProcessorHelper; 031import org.apache.camel.util.ObjectHelper; 032import org.apache.camel.util.ServiceHelper; 033 034/** 035 * Marshals the body of the incoming message using the given 036 * <a href="http://camel.apache.org/data-format.html">data format</a> 037 * 038 * @version 039 */ 040public class MarshalProcessor extends ServiceSupport implements AsyncProcessor, Traceable, CamelContextAware, IdAware { 041 private String id; 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 OutputStreamBuilder osb = OutputStreamBuilder.withExchange(exchange); 059 060 Message in = exchange.getIn(); 061 Object body = in.getBody(); 062 063 // lets setup the out message before we invoke the dataFormat 064 // so that it can mutate it if necessary 065 Message out = exchange.getOut(); 066 out.copyFrom(in); 067 068 try { 069 dataFormat.marshal(exchange, body, osb); 070 out.setBody(osb.build()); 071 } catch (Throwable e) { 072 // remove OUT message, as an exception occurred 073 exchange.setOut(null); 074 exchange.setException(e); 075 } 076 077 callback.done(true); 078 return true; 079 } 080 081 @Override 082 public String toString() { 083 return "Marshal[" + dataFormat + "]"; 084 } 085 086 public String getTraceLabel() { 087 return "marshal[" + dataFormat + "]"; 088 } 089 090 public String getId() { 091 return id; 092 } 093 094 public void setId(String id) { 095 this.id = id; 096 } 097 098 public CamelContext getCamelContext() { 099 return camelContext; 100 } 101 102 public void setCamelContext(CamelContext camelContext) { 103 this.camelContext = camelContext; 104 } 105 106 @Override 107 protected void doStart() throws Exception { 108 // inject CamelContext on data format 109 if (dataFormat instanceof CamelContextAware) { 110 ((CamelContextAware) dataFormat).setCamelContext(camelContext); 111 } 112 // add dataFormat as service which will also start the service 113 // (false => we handle the lifecycle of the dataFormat) 114 getCamelContext().addService(dataFormat, false, true); 115 } 116 117 @Override 118 protected void doStop() throws Exception { 119 ServiceHelper.stopService(dataFormat); 120 getCamelContext().removeService(dataFormat); 121 } 122}