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The Core Camel Java DSL based router
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.camel.processor.interceptor;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.Service;
import org.apache.camel.impl.DefaultExchange;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.util.IntrospectionSupport;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ServiceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Deprecated
public class DefaultTraceEventHandler implements TraceEventHandler, Service {
private static final Logger LOG = LoggerFactory.getLogger(DefaultTraceEventHandler.class);
private Producer traceEventProducer;
private Class jpaTraceEventMessageClass;
private String jpaTraceEventMessageClassName;
private final Tracer tracer;
public DefaultTraceEventHandler(Tracer tracer) {
this.tracer = tracer;
}
private synchronized void loadJpaTraceEventMessageClass(Exchange exchange) {
if (jpaTraceEventMessageClass == null) {
jpaTraceEventMessageClassName = tracer.getJpaTraceEventMessageClassName();
}
if (jpaTraceEventMessageClass == null) {
jpaTraceEventMessageClass = exchange.getContext().getClassResolver().resolveClass(jpaTraceEventMessageClassName);
if (jpaTraceEventMessageClass == null) {
throw new IllegalArgumentException("Cannot find class: " + jpaTraceEventMessageClassName
+ ". Make sure camel-jpa.jar is in the classpath.");
}
}
}
private synchronized Producer getTraceEventProducer(Exchange exchange) throws Exception {
if (traceEventProducer == null) {
// create producer when we have access the camel context (we dont in doStart)
Endpoint endpoint = tracer.getDestination() != null ? tracer.getDestination() : exchange.getContext().getEndpoint(tracer.getDestinationUri());
traceEventProducer = endpoint.createProducer();
ServiceHelper.startService(traceEventProducer);
}
return traceEventProducer;
}
@Override
public void traceExchange(ProcessorDefinition node, Processor target, TraceInterceptor traceInterceptor, Exchange exchange) throws Exception {
if (tracer.getDestination() != null || tracer.getDestinationUri() != null) {
// create event exchange and add event information
Date timestamp = new Date();
Exchange event = new DefaultExchange(exchange);
event.setProperty(Exchange.TRACE_EVENT_NODE_ID, node.getId());
event.setProperty(Exchange.TRACE_EVENT_TIMESTAMP, timestamp);
// keep a reference to the original exchange in case its needed
event.setProperty(Exchange.TRACE_EVENT_EXCHANGE, exchange);
// create event message to sent as in body containing event information such as
// from node, to node, etc.
TraceEventMessage msg = new DefaultTraceEventMessage(timestamp, node, exchange);
// should we use ordinary or jpa objects
if (tracer.isUseJpa()) {
if (LOG.isTraceEnabled()) {
LOG.trace("Using class: {} for tracing event messages", this.jpaTraceEventMessageClassName);
}
// load the jpa event message class
loadJpaTraceEventMessageClass(exchange);
// create a new instance of the event message class
Object jpa = ObjectHelper.newInstance(jpaTraceEventMessageClass);
// copy options from event to jpa
Map options = new HashMap<>();
IntrospectionSupport.getProperties(msg, options, null);
IntrospectionSupport.setProperties(exchange.getContext().getTypeConverter(), jpa, options);
// and set the timestamp as its not a String type
IntrospectionSupport.setProperty(exchange.getContext().getTypeConverter(), jpa, "timestamp", msg.getTimestamp());
event.getIn().setBody(jpa);
} else {
event.getIn().setBody(msg);
}
// marker property to indicate its a tracing event being routed in case
// new Exchange instances is created during trace routing so we can check
// for this marker when interceptor also kick in during routing of trace events
event.setProperty(Exchange.TRACE_EVENT, Boolean.TRUE);
try {
// process the trace route
getTraceEventProducer(exchange).process(event);
} catch (Exception e) {
// log and ignore this as the original Exchange should be allowed to continue
LOG.error("Error processing trace event (original Exchange will continue): {}", event, e);
}
}
}
@Override
public Object traceExchangeIn(ProcessorDefinition node, Processor target, TraceInterceptor traceInterceptor, Exchange exchange) throws Exception {
traceExchange(node, target, traceInterceptor, exchange);
return null;
}
@Override
public void traceExchangeOut(ProcessorDefinition node, Processor target, TraceInterceptor traceInterceptor, Exchange exchange, Object traceState) throws Exception {
traceExchange(node, target, traceInterceptor, exchange);
}
@Override
public void start() throws Exception {
traceEventProducer = null;
}
@Override
public void stop() throws Exception {
if (traceEventProducer != null) {
ServiceHelper.stopService(traceEventProducer);
}
}
}