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The metrics: component allows to collect various metrics directly from Camel routes. Supported metric types are counter, histogram, meter and timer. Metrics provides simple way to measure behaviour of application. Configurable reporting backend is enabling different integration options for collecting and visualizing statistics. The component also provides a MetricsRoutePolicyFactory which allows to expose route statistics using codehale metrics, see bottom of page for details.

Maven users will need to add the following dependency to their pom.xml for this component:

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// sets timer action using header
from("direct:in")
    .setHeader(MetricsConstants.HEADER_TIMER_ACTION, TimerAction.start)
    .to("metric:timer:simple.timer")
    .to("direct:out");

MetricsRoutePolicyFactory

This factory allows to add a RoutePolicy for each route which exposes route utilization statistics using codehale metrics. This factory can be used in Java and XML as the examples below demonstrates. 

From Java you just add the factory to the CamelContext as shown below:

context.addRoutePolicyFactory(new MetricsRoutePolicyFactory());

And from XML DSL you define a <bean> as follows:

  <!-- use camel-metrics route policy to gather metrics for all routes -->
  <bean id="metricsRoutePolicyFactory" class="org.apache.camel.component.metrics.routepolicy.MetricsRoutePolicyFactory"/>

The MetricsRoutePolicyFactory and MetricsRoutePolicy supports the following options:

From Java code tou can get hold of the com.codahale.metrics.MetricRegistry from the org.apache.camel.component.metrics.routepolicy.MetricsRegistryService as shown below:

MetricRegistryService registryService = context.hasService(MetricsRegistryService.class);
if (registryService != null) {
  MetricsRegistry registry = registryService.getMetricsRegistry();
  ...
}