Chapter 240. OpenTracing Component

Include the camel-opentracing component in your POM, along with any specific dependencies associated with the chosen OpenTracing compliant Tracer.

To explicitly configure OpenTracing support, instantiate the OpenTracingTracer and initialize the camel context. You can optionally specify a Tracer, or alternatively it can be implicitly discovered using the Registry or ServiceLoader.

OpenTracingTracer ottracer = new OpenTracingTracer();
// By default it uses a Noop Tracer, but you can override it with a specific OpenTracing implementation.
ottracer.setTracer(...);
// And then initialize the context
ottracer.init(camelContext);

OpenTracingTracer ottracer = new OpenTracingTracer();
// By default it uses a Noop Tracer, but you can override it with a specific OpenTracing implementation.
ottracer.setTracer(...);
// And then initialize the context
ottracer.init(camelContext);

To use OpenTracingTracer in XML, all you need to do is to define the OpenTracing tracer beans. Camel will automatically discover and use them.

  <bean id="tracer" class="..."/>
  <bean id="ottracer" class="org.apache.camel.opentracing.OpenTracingTracer">
    <property name="tracer" ref="tracer"/>
  </bean>

  <bean id="tracer" class="..."/>
  <bean id="ottracer" class="org.apache.camel.opentracing.OpenTracingTracer">
    <property name="tracer" ref="tracer"/>
  </bean>

If you are using Spring Boot then you can add the camel-opentracing-starter dependency, and turn on OpenTracing by annotating the main class with @CamelOpenTracing.

The Tracer will be implicitly obtained from the camel context’s Registry, or the ServiceLoader, unless a Tracer bean has been defined by the application.

The third approach is to use a Java Agent to automatically configure the OpenTracing support.

Include the camel-opentracing component in your POM, along with any specific dependencies associated with the chosen OpenTracing compliant Tracer.

The OpenTracing Java Agent is associated with the following dependency:

    <dependency>
      <groupId>io.opentracing.contrib</groupId>
      <artifactId>opentracing-agent</artifactId>
    </dependency>

    <dependency>
      <groupId>io.opentracing.contrib</groupId>
      <artifactId>opentracing-agent</artifactId>
    </dependency>

The Tracer used will be implicitly loaded from the camel context Registry or using the ServiceLoader.

How this agent is used will be specific to how you execute your application. Service2 in the camel-example-opentracing downloads the agent into a local folder and then uses the exec-maven-plugin to launch the service with the -javaagent command line option.