http://www.dropwizard.io/2.0.18/dropwizard-bom/dropwizard-dependencies/dropwizard-parent/dropwizard-metrics: Dropwizard is a Java framework for developing ops-friendly, high-performance, RESTful web applications.
  • Coda Hale
  • Nick Telford
  • Graham O'Regan
  • Ryan Kennedy
  • Camille Fournier
  • Carlo Barbara
  • Matt Veitas
  • Ryan Tenney
  • Jochen Schalanda
  • Glenn McAllister
  • Nick Babcock
  • Justin Plock
  • Artem Prigoda 
package io.dropwizard.metrics;

import com.codahale.metrics.ScheduledReporter;
import io.dropwizard.lifecycle.Managed;
import io.dropwizard.util.Duration;


Manages a ScheduledReporter lifecycle. 
/**
 * Manages a {@link ScheduledReporter} lifecycle.
 */
public class ScheduledReporterManager implements Managed {
    private final ScheduledReporter reporter;
    private final Duration period;
    private final boolean reportOnStop;

    
Manages the given reporter by reporting with the given period. 
Params:
  • reporter – the reporter to manage.
  • period –   the frequency to report metrics at.
See Also:
/**
     * Manages the given {@code reporter} by reporting with the given {@code period}.
     *
     * @param reporter the reporter to manage.
     * @param period   the frequency to report metrics at.
     * @see #ScheduledReporterManager(ScheduledReporter, Duration, boolean)
     */
    public ScheduledReporterManager(ScheduledReporter reporter, Duration period) {
        this(reporter, period, false);
    }

    
Manages the given reporter by reporting with the given period. 
Params:
  • reporter –     the reporter to manage.
  • period –       the frequency to report metrics at.
  • reportOnStop – whether the reporter should send one last report upon stopping
Since:2.0
/**
     * Manages the given {@code reporter} by reporting with the given {@code period}.
     *
     * @param reporter     the reporter to manage.
     * @param period       the frequency to report metrics at.
     * @param reportOnStop whether the reporter should send one last report upon stopping
     * @since 2.0
     */
    public ScheduledReporterManager(ScheduledReporter reporter, Duration period, boolean reportOnStop) {
        this.reporter = reporter;
        this.period = period;
        this.reportOnStop = reportOnStop;
    }

    
Begins reporting metrics using the configured ScheduledReporter. 
Throws:
/**
     * Begins reporting metrics using the configured {@link ScheduledReporter}.
     *
     * @throws Exception
     */
    @Override
    public void start() throws Exception {
        reporter.start(period.getQuantity(), period.getUnit());
    }

    
Stops the configured ScheduledReporter from reporting metrics. 
Throws:
/**
     * Stops the configured {@link ScheduledReporter} from reporting metrics.
     *
     * @throws Exception
     */
    @Override
    public void stop() throws Exception {
        try {
            if (reportOnStop) {
                reporter.report();
            }
        } finally {
            reporter.stop();
        }
    }
}