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.component.directvm; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Processor; 021 import org.apache.camel.processor.DelegateProcessor; 022 import org.apache.camel.util.ExchangeHelper; 023 import org.slf4j.Logger; 024 import org.slf4j.LoggerFactory; 025 026 /** 027 * 028 */ 029 public final class DirectVmProcessor extends DelegateProcessor { 030 031 private static final transient Logger LOG = LoggerFactory.getLogger(DirectVmProcessor.class); 032 private final DirectVmEndpoint endpoint; 033 034 public DirectVmProcessor(Processor processor, DirectVmEndpoint endpoint) { 035 super(processor); 036 this.endpoint = endpoint; 037 } 038 039 @Override 040 public void process(Exchange exchange) throws Exception { 041 // need to use a copy of the incoming exchange, so we route using this camel context 042 Exchange copy = prepareExchange(exchange); 043 044 ClassLoader current = Thread.currentThread().getContextClassLoader(); 045 boolean changed = false; 046 try { 047 // set TCCL to application context class loader if given 048 ClassLoader appClassLoader = endpoint.getCamelContext().getApplicationContextClassLoader(); 049 if (appClassLoader != null) { 050 LOG.trace("Setting Thread ContextClassLoader to {}", appClassLoader); 051 Thread.currentThread().setContextClassLoader(appClassLoader); 052 changed = true; 053 } 054 getProcessor().process(copy); 055 } finally { 056 // make sure to copy results back 057 ExchangeHelper.copyResults(exchange, copy); 058 // restore TCCL if it was changed during processing 059 if (changed) { 060 LOG.trace("Restoring Thread ContextClassLoader to {}", current); 061 Thread.currentThread().setContextClassLoader(current); 062 } 063 } 064 } 065 066 /** 067 * Strategy to prepare exchange for being processed by this consumer 068 * 069 * @param exchange the exchange 070 * @return the exchange to process by this consumer. 071 */ 072 protected Exchange prepareExchange(Exchange exchange) { 073 // send a new copied exchange with new camel context (do not handover completions) 074 Exchange newExchange = ExchangeHelper.copyExchangeAndSetCamelContext(exchange, endpoint.getCamelContext(), false); 075 // set the from endpoint 076 newExchange.setFromEndpoint(endpoint); 077 return newExchange; 078 } 079 080 @Override 081 public String toString() { 082 return "DirectVm[" + processor + "]"; 083 } 084 }