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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.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.camel.CamelContext;
import org.apache.camel.Endpoint;
import org.apache.camel.LoggingLevel;
import org.apache.camel.Predicate;
import org.apache.camel.Processor;
import org.apache.camel.Service;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.model.RouteDefinitionHelper;
import org.apache.camel.processor.CamelLogProcessor;
import org.apache.camel.spi.ExchangeFormatter;
import org.apache.camel.spi.InterceptStrategy;
import org.apache.camel.util.CamelLogger;
/**
* An interceptor strategy for tracing routes
*
* @version
*/
public class Tracer implements InterceptStrategy, Service {
private static final String JPA_TRACE_EVENT_MESSAGE = "org.apache.camel.processor.interceptor.jpa.JpaTraceEventMessage";
private TraceFormatter formatter = new DefaultTraceFormatter();
private boolean enabled = true;
private String logName = Tracer.class.getName();
private LoggingLevel logLevel = LoggingLevel.INFO;
private Predicate traceFilter;
private boolean traceInterceptors;
private boolean traceExceptions = true;
private boolean logStackTrace;
private boolean traceOutExchanges;
private String destinationUri;
private Endpoint destination;
private boolean useJpa;
private CamelLogProcessor logger;
private TraceInterceptorFactory traceInterceptorFactory = new DefaultTraceInterceptorFactory();
private final List traceHandlers = new CopyOnWriteArrayList();
private String jpaTraceEventMessageClassName = JPA_TRACE_EVENT_MESSAGE;
private boolean jmxTraceNotifications;
private int traceBodySize = 10000;
public Tracer() {
traceHandlers.add(new DefaultTraceEventHandler(this));
}
/**
* Creates a new tracer.
*
* @param context Camel context
* @return a new tracer
*/
public static Tracer createTracer(CamelContext context) {
Tracer tracer = new Tracer();
// lets see if we have a formatter if so use it
TraceFormatter formatter = context.getRegistry().lookupByNameAndType("traceFormatter", TraceFormatter.class);
if (formatter != null) {
tracer.setFormatter(formatter);
}
return tracer;
}
/**
* A helper method to return the Tracer instance if one is enabled
*
* @return the tracer or null if none can be found
*/
public static Tracer getTracer(CamelContext context) {
List list = context.getInterceptStrategies();
for (InterceptStrategy interceptStrategy : list) {
if (interceptStrategy instanceof Tracer) {
return (Tracer) interceptStrategy;
}
}
return null;
}
/**
* Gets the logger to be used for tracers that can format and log a given exchange.
*
* @param formatter the exchange formatter
* @return the logger to use
*/
public synchronized CamelLogProcessor getLogger(ExchangeFormatter formatter) {
if (logger == null) {
logger = new CamelLogProcessor(new CamelLogger(getLogName(), getLogLevel()), formatter);
}
return logger;
}
public Processor wrapProcessorInInterceptors(CamelContext context, ProcessorDefinition definition,
Processor target, Processor nextTarget) throws Exception {
// Force the creation of an id, otherwise the id is not available when the trace formatter is
// outputting trace information
RouteDefinitionHelper.forceAssignIds(context, definition);
return getTraceInterceptorFactory().createTraceInterceptor(definition, target, formatter, this);
}
public TraceFormatter getFormatter() {
return formatter;
}
public DefaultTraceFormatter getDefaultTraceFormatter() {
if (formatter instanceof DefaultTraceFormatter) {
return (DefaultTraceFormatter) formatter;
}
return null;
}
public void setFormatter(TraceFormatter formatter) {
this.formatter = formatter;
}
public void setEnabled(boolean flag) {
enabled = flag;
}
public boolean isEnabled() {
return enabled;
}
public boolean isTraceInterceptors() {
return traceInterceptors;
}
/**
* Sets whether interceptors should be traced or not
*/
public void setTraceInterceptors(boolean traceInterceptors) {
this.traceInterceptors = traceInterceptors;
}
public Predicate getTraceFilter() {
return traceFilter;
}
/**
* Sets a predicate to be used as filter when tracing
*/
public void setTraceFilter(Predicate traceFilter) {
this.traceFilter = traceFilter;
}
public LoggingLevel getLogLevel() {
return logLevel;
}
/**
* Sets the logging level to output tracing. Will use INFO level by default.
*/
public void setLogLevel(LoggingLevel logLevel) {
this.logLevel = logLevel;
// update logger if its in use
if (logger != null) {
logger.getLogger().setLevel(logLevel);
}
}
public boolean isTraceExceptions() {
return traceExceptions;
}
/**
* Sets whether thrown exceptions should be traced
*/
public void setTraceExceptions(boolean traceExceptions) {
this.traceExceptions = traceExceptions;
}
public boolean isLogStackTrace() {
return logStackTrace;
}
/**
* Sets whether thrown exception stacktrace should be traced, if disabled then only the exception message is logged
*/
public void setLogStackTrace(boolean logStackTrace) {
this.logStackTrace = logStackTrace;
}
public String getLogName() {
return logName;
}
/**
* Sets the logging name to use.
* Will default use org.apache.camel.processor.interceptor.TraceInterceptor.
*/
public void setLogName(String logName) {
this.logName = logName;
// update logger if its in use
if (logger != null) {
logger.getLogger().setLogName(logName);
}
}
/**
* Sets whether exchanges coming out of processors should be traced
*/
public void setTraceOutExchanges(boolean traceOutExchanges) {
this.traceOutExchanges = traceOutExchanges;
}
public boolean isTraceOutExchanges() {
return traceOutExchanges;
}
public String getDestinationUri() {
return destinationUri;
}
/**
* Sets an optional destination to send the traced Exchange.
*
* Can be used to store tracing as files, in a database or whatever. The routing of the Exchange
* will happen synchronously and the original route will first continue when this destination routing
* has been completed.
*/
public void setDestinationUri(String destinationUri) {
this.destinationUri = destinationUri;
}
public Endpoint getDestination() {
return destination;
}
/**
* See {@link #setDestinationUri(String)}
*/
public void setDestination(Endpoint destination) {
this.destination = destination;
}
public boolean isUseJpa() {
return useJpa;
}
/**
* Sets whether we should use a JpaTraceEventMessage instead of
* an ordinary {@link org.apache.camel.processor.interceptor.DefaultTraceEventMessage}
*
* Use this to allow persistence of trace events into a database using JPA.
* This requires camel-jpa in the classpath.
*/
public void setUseJpa(boolean useJpa) {
this.useJpa = useJpa;
}
public TraceInterceptorFactory getTraceInterceptorFactory() {
return this.traceInterceptorFactory;
}
/**
* Set the factory to be used to create the trace interceptor.
* It is expected that the factory will create a subclass of TraceInterceptor.
*
* Use this to take complete control of how trace events are handled.
* The TraceInterceptorFactory should only be set before any routes are created, hence this
* method is not thread safe.
*/
public void setTraceInterceptorFactory(TraceInterceptorFactory traceInterceptorFactory) {
this.traceInterceptorFactory = traceInterceptorFactory;
}
/**
*
* @return the first trace event handler
*/
@Deprecated
public TraceEventHandler getTraceHandler() {
return traceHandlers.get(0);
}
/**
*
* @return list of tracehandlers
*/
public List getTraceHandlers() {
return traceHandlers;
}
/**
* Set the object to be used to perform tracing.
*
* Use this to take more control of how trace events are persisted.
* Setting the traceHandler provides a simpler mechanism for controlling tracing
* than the TraceInterceptorFactory.
* The TraceHandler should only be set before any routes are created, hence this
* method is not thread safe.
*/
@Deprecated
public void setTraceHandler(TraceEventHandler traceHandler) {
this.traceHandlers.clear();
this.traceHandlers.add(traceHandler);
}
/**
* Add the given tracehandler
*/
public void addTraceHandler(TraceEventHandler traceHandler) {
this.traceHandlers.add(traceHandler);
}
/**
* Remove the given tracehandler
*/
public void removeTraceHandler(TraceEventHandler traceHandler) {
this.traceHandlers.remove(traceHandler);
}
public String getJpaTraceEventMessageClassName() {
return jpaTraceEventMessageClassName;
}
/**
* Set the fully qualified name of the class to be used by the JPA event tracing.
*
* The class must exist in the classpath and be available for dynamic loading.
* The class name should only be set before any routes are created, hence this
* method is not thread safe.
*/
public void setJpaTraceEventMessageClassName(String jpaTraceEventMessageClassName) {
this.jpaTraceEventMessageClassName = jpaTraceEventMessageClassName;
}
public boolean isJmxTraceNotifications() {
return jmxTraceNotifications;
}
public void setJmxTraceNotifications(boolean jmxTraceNotifications) {
this.jmxTraceNotifications = jmxTraceNotifications;
}
public int getTraceBodySize() {
return traceBodySize;
}
public void setTraceBodySize(int traceBodySize) {
this.traceBodySize = traceBodySize;
}
public void start() throws Exception {
// noop
}
public void stop() throws Exception {
traceHandlers.clear();
}
@Override
public String toString() {
return "Tracer";
}
}