Metrics

Add the Ninja-Metrics dependency

<dependency>
    <groupId>org.ninjaframework</groupId>
    <artifactId>ninja-metrics</artifactId>
    <version>${ninja.version}</version>
</dependency>

Install the MetricsModule in your conf.Module class.

@Singleton
public class Module extends AbstractModule {

    @Override
    protected void configure() {

        install(new MetricsModule());

    }
}

Subclass InstrumentedNinja in your conf.Ninja class. (optional)

package conf;

import ninja.metrics.InstrumentedNinja;

public class Ninja extends InstrumentedNinja {

}

Collecting Metrics

Now you are ready to start annotating your controllers or any other methods.

You have several choices in the collection of metrics:

• Do nothing
• Counted A counter increments (and optionally decrements) when a method is executed.
• Metered A meter measures the rate of events over time (e.g., “requests per second”). In addition to the mean rate, meters also track 1-, 5-, and 15-minute moving averages.
• Timed A timer measures both the rate that a particular piece of code is called and the distribution of its duration.

1. Start by sprinkling @Counted, @Metered, or @Timed on some of your controller methods.
2. Start up VisualVM (and install the MBeans plugin) or JConsole.
3. Browse your app and refresh the collected metrics.

package controllers;

@Singleton
public class AppController {

    @Timed
    public Result index() {

        return Results.html();
    }

}

Collecting Cache Metrics

If you want to instrument your NinjaCache, Ninja-Metrics supports instrumenting both the EhCache and the Memcached implementations.

In your application.conf file specify:

cache.implementation = ninja.metrics.InstrumentedEhCache

or

cache.implementation = ninja.metrics.InstrumentedMemcached

Collecting Additional Metrics

metrics.jvm.enabled = true

metrics.logback.enabled = true

Reporting Metrics via MBeans for VisualVM, JConsole, or JMX

If you want to expose your metrics to VisualVM, JConsole, or JMX you must enable the MBeans reporter in your application.conf file.

metrics.mbeans.enabled = true

You can view the collected metrics using VisualVM (with the MBeans plugin installed) or using JConsole.

Reporting Metrics to Graphite

Ninja Metrics supports reporting to Graphite.

Add the following dependency to your application pom.xml.

<dependency>
    <groupId>org.ninjaframework</groupId>
    <artifactId>ninja-metrics-graphite</artifactId>
    <version>${ninja.version}</version>
</dependency>

Bind the Graphite integration in your Module.java.

@Singleton
public class Module extends AbstractModule {

  @Override
  protected void configure() {
    bind(NinjaGraphite.class);
  }
}

Add the following settings to your application.conf.

metrics.graphite.enabled = true
metrics.graphite.address = graphite.example.com
metrics.graphite.port = 2003
metrics.graphite.pickled = false
metrics.graphite.period = 60s

By default all metrics will be prefixed with the hostname. To specify a custom prefix add the following setting.

metrics.graphite.prefix = my.custom.prefix

Reporting Metrics to Ganglia

Ninja Metrics supports reporting to Ganglia.

Add the following dependency to your application pom.xml.

<dependency>
    <groupId>org.ninjaframework</groupId>
    <artifactId>ninja-metrics-ganglia</artifactId>
    <version>${ninja.version}</version>
</dependency>

Bind the Ganglia integration in your Module.java.

@Singleton
public class Module extends AbstractModule {

  @Override
  protected void configure() {
    bind(NinjaGanglia.class);
  }
}

Add the following settings to your application.conf.

metrics.ganglia.enabled = true
metrics.ganglia.address = ganglia.example.com
metrics.ganglia.port = 8649
metrics.ganglia.period = 60s

Reporting Metrics to InfluxDB

Ninja Metrics supports reporting to InfluxDB.

Add the following dependency to your application pom.xml.

<dependency>
    <groupId>org.ninjaframework</groupId>
    <artifactId>ninja-metrics-influxdb</artifactId>
    <version>${ninja.version}</version>
</dependency>

Bind the InfluxDB integration in your Module.java.

@Singleton
public class Module extends AbstractModule {

  @Override
  protected void configure() {
    bind(NinjaInfluxDB.class);
  }
}

Add the following settings to your application.conf.

metrics.influxdb.enabled = true
metrics.influxdb.address = localhost
metrics.influxdb.port = 8086
metrics.influxdb.database = mydb
metrics.influxdb.username = root
metrics.influxdb.password = root
metrics.influxdb.period = 60s

Reporting Metrics to Librato

Librato is a cloud-based metrics database and dashboard service.

Add the following dependency to your application pom.xml.

<dependency>
    <groupId>org.ninjaframework</groupId>
    <artifactId>ninja-metrics-librato</artifactId>
    <version>${ninja.version}</version>
</dependency>

Bind the Librato integration in your Module.java.

@Singleton
public class Module extends AbstractModule {

  @Override
  protected void configure() {
    bind(NinjaLibrato.class);
  }
}

Add the following settings to your application.conf.

metrics.librato.enabled = true
metrics.librato.username = person@example.com
metrics.librato.apikey = 12345cafebabe
metrics.librato.period = 60s