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.interceptor;
018
019 import java.util.Date;
020 import java.util.HashMap;
021 import java.util.Map;
022
023 import org.apache.camel.Endpoint;
024 import org.apache.camel.Exchange;
025 import org.apache.camel.Processor;
026 import org.apache.camel.Producer;
027 import org.apache.camel.Service;
028 import org.apache.camel.impl.DefaultExchange;
029 import org.apache.camel.model.ProcessorDefinition;
030 import org.apache.camel.util.IntrospectionSupport;
031 import org.apache.camel.util.ObjectHelper;
032 import org.apache.camel.util.ServiceHelper;
033 import org.slf4j.Logger;
034 import org.slf4j.LoggerFactory;
035
036 public class DefaultTraceEventHandler implements TraceEventHandler, Service {
037 private static final Logger LOG = LoggerFactory.getLogger(DefaultTraceEventHandler.class);
038
039 private Producer traceEventProducer;
040 private Class<?> jpaTraceEventMessageClass;
041 private String jpaTraceEventMessageClassName;
042
043 private final Tracer tracer;
044
045 public DefaultTraceEventHandler(Tracer tracer) {
046 this.tracer = tracer;
047 }
048
049 private synchronized void loadJpaTraceEventMessageClass(Exchange exchange) {
050 if (jpaTraceEventMessageClass == null) {
051 jpaTraceEventMessageClassName = tracer.getJpaTraceEventMessageClassName();
052 }
053 if (jpaTraceEventMessageClass == null) {
054 jpaTraceEventMessageClass = exchange.getContext().getClassResolver().resolveClass(jpaTraceEventMessageClassName);
055 if (jpaTraceEventMessageClass == null) {
056 throw new IllegalArgumentException("Cannot find class: " + jpaTraceEventMessageClassName
057 + ". Make sure camel-jpa.jar is in the classpath.");
058 }
059 }
060 }
061
062 private synchronized Producer getTraceEventProducer(Exchange exchange) throws Exception {
063 if (traceEventProducer == null) {
064 // create producer when we have access the the camel context (we dont in doStart)
065 Endpoint endpoint = tracer.getDestination() != null ? tracer.getDestination() : exchange.getContext().getEndpoint(tracer.getDestinationUri());
066 traceEventProducer = endpoint.createProducer();
067 ServiceHelper.startService(traceEventProducer);
068 }
069 return traceEventProducer;
070 }
071
072 @Override
073 public void traceExchange(ProcessorDefinition<?> node, Processor target, TraceInterceptor traceInterceptor, Exchange exchange) throws Exception {
074 if (tracer.getDestination() != null || tracer.getDestinationUri() != null) {
075
076 // create event exchange and add event information
077 Date timestamp = new Date();
078 Exchange event = new DefaultExchange(exchange);
079 event.setProperty(Exchange.TRACE_EVENT_NODE_ID, node.getId());
080 event.setProperty(Exchange.TRACE_EVENT_TIMESTAMP, timestamp);
081 // keep a reference to the original exchange in case its needed
082 event.setProperty(Exchange.TRACE_EVENT_EXCHANGE, exchange);
083
084 // create event message to sent as in body containing event information such as
085 // from node, to node, etc.
086 TraceEventMessage msg = new DefaultTraceEventMessage(timestamp, node, exchange);
087
088 // should we use ordinary or jpa objects
089 if (tracer.isUseJpa()) {
090 if (LOG.isTraceEnabled()) {
091 LOG.trace("Using class: " + this.jpaTraceEventMessageClassName + " for tracing event messages");
092 }
093
094 // load the jpa event message class
095 loadJpaTraceEventMessageClass(exchange);
096 // create a new instance of the event message class
097 Object jpa = ObjectHelper.newInstance(jpaTraceEventMessageClass);
098
099 // copy options from event to jpa
100 Map<String, Object> options = new HashMap<String, Object>();
101 IntrospectionSupport.getProperties(msg, options, null);
102 IntrospectionSupport.setProperties(exchange.getContext().getTypeConverter(), jpa, options);
103 // and set the timestamp as its not a String type
104 IntrospectionSupport.setProperty(exchange.getContext().getTypeConverter(), jpa, "timestamp", msg.getTimestamp());
105
106 event.getIn().setBody(jpa);
107 } else {
108 event.getIn().setBody(msg);
109 }
110
111 // marker property to indicate its a tracing event being routed in case
112 // new Exchange instances is created during trace routing so we can check
113 // for this marker when interceptor also kick in during routing of trace events
114 event.setProperty(Exchange.TRACE_EVENT, Boolean.TRUE);
115 try {
116 // process the trace route
117 getTraceEventProducer(exchange).process(event);
118 } catch (Exception e) {
119 // log and ignore this as the original Exchange should be allowed to continue
120 LOG.error("Error processing trace event (original Exchange will continue): " + event, e);
121 }
122 }
123 }
124
125 @Override
126 public Object traceExchangeIn(ProcessorDefinition<?> node, Processor target, TraceInterceptor traceInterceptor, Exchange exchange) throws Exception {
127 traceExchange(node, target, traceInterceptor, exchange);
128 return null;
129 }
130
131 @Override
132 public void traceExchangeOut(ProcessorDefinition<?> node, Processor target, TraceInterceptor traceInterceptor, Exchange exchange, Object traceState) throws Exception {
133 traceExchange(node, target, traceInterceptor, exchange);
134 }
135
136 @Override
137 public void start() throws Exception {
138 traceEventProducer = null;
139 }
140
141 @Override
142 public void stop() throws Exception {
143 if (traceEventProducer != null) {
144 ServiceHelper.stopService(traceEventProducer);
145 }
146 }
147
148 }