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.management; 018 019import java.util.EventObject; 020 021import org.apache.camel.CamelContext; 022import org.apache.camel.CamelContextAware; 023import org.apache.camel.Endpoint; 024import org.apache.camel.Exchange; 025import org.apache.camel.Producer; 026import org.apache.camel.support.EventNotifierSupport; 027import org.apache.camel.util.ObjectHelper; 028import org.apache.camel.util.ServiceHelper; 029import org.apache.camel.util.URISupport; 030 031/** 032 * A {@link org.apache.camel.spi.EventNotifier} which publishes the {@link EventObject} to some 033 * {@link org.apache.camel.Endpoint}. 034 * <p/> 035 * This notifier is only enabled when {@link CamelContext} is started. This avoids problems when 036 * sending notifications during start/shutdown of {@link CamelContext} which causes problems by 037 * sending those events to Camel routes by this notifier. 038 * 039 * @version 040 */ 041public class PublishEventNotifier extends EventNotifierSupport implements CamelContextAware { 042 043 private CamelContext camelContext; 044 private Endpoint endpoint; 045 private String endpointUri; 046 private Producer producer; 047 048 public void notify(EventObject event) throws Exception { 049 // only notify when we are started 050 if (!isStarted()) { 051 log.debug("Cannot publish event as notifier is not started: {}", event); 052 return; 053 } 054 055 // only notify when camel context is running 056 if (!camelContext.getStatus().isStarted()) { 057 log.debug("Cannot publish event as CamelContext is not started: {}", event); 058 return; 059 } 060 061 Exchange exchange = producer.getEndpoint().createExchange(); 062 exchange.getIn().setBody(event); 063 064 // make sure we don't send out events for this as well 065 // mark exchange as being published to event, to prevent creating new events 066 // for this as well (causing a endless flood of events) 067 exchange.setProperty(Exchange.NOTIFY_EVENT, Boolean.TRUE); 068 try { 069 producer.process(exchange); 070 } finally { 071 // and remove it when its done 072 exchange.removeProperty(Exchange.NOTIFY_EVENT); 073 } 074 } 075 076 public boolean isEnabled(EventObject event) { 077 return true; 078 } 079 080 public CamelContext getCamelContext() { 081 return camelContext; 082 } 083 084 public void setCamelContext(CamelContext camelContext) { 085 this.camelContext = camelContext; 086 } 087 088 public Endpoint getEndpoint() { 089 return endpoint; 090 } 091 092 public void setEndpoint(Endpoint endpoint) { 093 this.endpoint = endpoint; 094 } 095 096 public String getEndpointUri() { 097 return endpointUri; 098 } 099 100 public void setEndpointUri(String endpointUri) { 101 this.endpointUri = endpointUri; 102 } 103 104 @Override 105 protected void doStart() throws Exception { 106 ObjectHelper.notNull(camelContext, "camelContext", this); 107 if (endpoint == null && endpointUri == null) { 108 throw new IllegalArgumentException("Either endpoint or endpointUri must be configured"); 109 } 110 111 if (endpoint == null) { 112 endpoint = camelContext.getEndpoint(endpointUri); 113 } 114 115 producer = endpoint.createProducer(); 116 ServiceHelper.startService(producer); 117 } 118 119 @Override 120 protected void doStop() throws Exception { 121 ServiceHelper.stopService(producer); 122 } 123 124 @Override 125 public String toString() { 126 return "PublishEventNotifier[" + (endpoint != null ? endpoint : URISupport.sanitizeUri(endpointUri)) + "]"; 127 } 128 129}