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.processor; 018 019 import java.util.List; 020 021 import org.apache.camel.AsyncCallback; 022 import org.apache.camel.CamelContext; 023 import org.apache.camel.Exchange; 024 import org.apache.camel.Processor; 025 import org.apache.camel.Route; 026 import org.apache.camel.StatefulService; 027 import org.apache.camel.spi.RoutePolicy; 028 import org.apache.camel.support.SynchronizationAdapter; 029 import org.slf4j.Logger; 030 import org.slf4j.LoggerFactory; 031 032 /** 033 * {@link Processor} which instruments the {@link RoutePolicy}. 034 * 035 * @version 036 */ 037 public class RoutePolicyProcessor extends DelegateAsyncProcessor { 038 039 private static final Logger LOG = LoggerFactory.getLogger(RoutePolicyProcessor.class); 040 private final List<RoutePolicy> routePolicies; 041 private Route route; 042 043 public RoutePolicyProcessor(Processor processor, List<RoutePolicy> routePolicies) { 044 super(processor); 045 this.routePolicies = routePolicies; 046 } 047 048 @Override 049 public String toString() { 050 return "RoutePolicy[" + routePolicies + "]"; 051 } 052 053 @Override 054 public boolean process(Exchange exchange, AsyncCallback callback) { 055 056 // invoke begin 057 for (RoutePolicy policy : routePolicies) { 058 try { 059 if (isRoutePolicyRunAllowed(policy)) { 060 policy.onExchangeBegin(route, exchange); 061 } 062 } catch (Exception e) { 063 LOG.warn("Error occurred during onExchangeBegin on RoutePolicy: " + policy 064 + ". This exception will be ignored", e); 065 } 066 } 067 068 // add on completion that invokes the policy callback on complete 069 // as the Exchange can be routed async and thus we need the callback to 070 // invoke when the route is completed 071 exchange.addOnCompletion(new SynchronizationAdapter() { 072 @Override 073 public void onDone(Exchange exchange) { 074 // do not invoke it if Camel is stopping as we don't want 075 // the policy to start a consumer during Camel is stopping 076 if (isCamelStopping(exchange.getContext())) { 077 return; 078 } 079 080 for (RoutePolicy policy : routePolicies) { 081 try { 082 if (isRoutePolicyRunAllowed(policy)) { 083 policy.onExchangeDone(route, exchange); 084 } 085 } catch (Exception e) { 086 LOG.warn("Error occurred during onExchangeDone on RoutePolicy: " + policy 087 + ". This exception will be ignored", e); 088 } 089 } 090 } 091 092 @Override 093 public String toString() { 094 return "RoutePolicyOnCompletion"; 095 } 096 }); 097 098 return super.process(exchange, callback); 099 } 100 101 /** 102 * Sets the route this policy applies. 103 * 104 * @param route the route 105 */ 106 public void setRoute(Route route) { 107 this.route = route; 108 } 109 110 /** 111 * Strategy to determine if this policy is allowed to run 112 * 113 * @param policy the policy 114 * @return <tt>true</tt> to run 115 */ 116 protected boolean isRoutePolicyRunAllowed(RoutePolicy policy) { 117 if (policy instanceof StatefulService) { 118 StatefulService ss = (StatefulService) policy; 119 return ss.isRunAllowed(); 120 } 121 return true; 122 } 123 124 private static boolean isCamelStopping(CamelContext context) { 125 if (context instanceof StatefulService) { 126 StatefulService ss = (StatefulService) context; 127 return ss.isStopping() || ss.isStopped(); 128 } 129 return false; 130 } 131 132 }