src/main/java/com/googlesource/gerrit/plugins/cookbook/ConsoleMetricReporter.java

// Copyright (C) 2015 The Android Open Source Project
//
// Licensed 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 com.googlesource.gerrit.plugins.cookbook;

import com.google.gerrit.extensions.annotations.Listen;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import com.codahale.metrics.ConsoleReporter;
import com.codahale.metrics.MetricRegistry;

import java.util.concurrent.TimeUnit;

/**
 * Demonstration of how to add a new Dropwizard  Metrics Reporter using
 * Gerrit's plug-in API.
 *
 * @see <a href="https://dropwizard.github.io/metrics/3.1.0/getting-started/#reporting-via-jmx">here</a>
 * @see <a href="https://dropwizard.github.io/metrics/3.1.0/getting-started/#reporting-via-http">here</a>
 * @see <a href="https://dropwizard.github.io/metrics/3.1.0/getting-started/#other-reporting">here</a>
 */
@Listen
@Singleton
public class ConsoleMetricReporter implements LifecycleListener {
  private ConsoleReporter consoleReporter;

  @Inject
  public ConsoleMetricReporter(MetricRegistry registry) {
    this.consoleReporter =
        ConsoleReporter.forRegistry(registry).convertRatesTo(TimeUnit.SECONDS)
            .convertDurationsTo(TimeUnit.MILLISECONDS).build();
  }

  @Override
  public void start() {
    consoleReporter.start(1, TimeUnit.MINUTES);
  }

  @Override
  public void stop() {
    consoleReporter.stop();
  }
}