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.component.directvm; 018 019import org.apache.camel.AsyncCallback; 020import org.apache.camel.Exchange; 021import org.apache.camel.Processor; 022import org.apache.camel.processor.DelegateAsyncProcessor; 023import org.apache.camel.util.ExchangeHelper; 024import org.slf4j.Logger; 025import org.slf4j.LoggerFactory; 026 027/** 028* 029*/ 030public final class DirectVmProcessor extends DelegateAsyncProcessor { 031 032 private static final Logger LOG = LoggerFactory.getLogger(DirectVmProcessor.class); 033 private final DirectVmEndpoint endpoint; 034 035 public DirectVmProcessor(Processor processor, DirectVmEndpoint endpoint) { 036 super(processor); 037 this.endpoint = endpoint; 038 } 039 040 @Override 041 public boolean process(final Exchange exchange, final AsyncCallback callback) { 042 // need to use a copy of the incoming exchange, so we route using this camel context 043 final Exchange copy = prepareExchange(exchange); 044 045 ClassLoader current = Thread.currentThread().getContextClassLoader(); 046 boolean changed = false; 047 try { 048 // set TCCL to application context class loader if given 049 ClassLoader appClassLoader = endpoint.getCamelContext().getApplicationContextClassLoader(); 050 if (appClassLoader != null) { 051 LOG.trace("Setting Thread ContextClassLoader to {}", appClassLoader); 052 Thread.currentThread().setContextClassLoader(appClassLoader); 053 changed = true; 054 } 055 return processor.process(copy, new AsyncCallback() { 056 @Override 057 public void done(boolean done) { 058 try { 059 // make sure to copy results back 060 ExchangeHelper.copyResults(exchange, copy); 061 } finally { 062 // must call callback when we are done 063 callback.done(done); 064 } 065 } 066 }); 067 } finally { 068 // restore TCCL if it was changed during processing 069 if (changed) { 070 LOG.trace("Restoring Thread ContextClassLoader to {}", current); 071 Thread.currentThread().setContextClassLoader(current); 072 } 073 } 074 } 075 076 /** 077 * Strategy to prepare exchange for being processed by this consumer 078 * 079 * @param exchange the exchange 080 * @return the exchange to process by this consumer. 081 */ 082 protected Exchange prepareExchange(Exchange exchange) { 083 // send a new copied exchange with new camel context (do not handover completions) 084 Exchange newExchange = ExchangeHelper.copyExchangeAndSetCamelContext(exchange, endpoint.getCamelContext(), false); 085 // set the from endpoint 086 newExchange.setFromEndpoint(endpoint); 087 return newExchange; 088 } 089 090 @Override 091 public String toString() { 092 return "DirectVm[" + processor + "]"; 093 } 094}