com.github.marschall.micrometer.jfr.JfrLongTaskTimer Maven / Gradle / Ivy

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package com.github.marschall.micrometer.jfr;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.LongAdder;
import java.util.function.Consumer;
import java.util.function.Function;

import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.DistributionSummary;
import io.micrometer.core.instrument.FunctionCounter;
import io.micrometer.core.instrument.FunctionTimer;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.LongTaskTimer;
import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.TimeGauge;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.distribution.HistogramSnapshot;
import io.micrometer.core.instrument.util.TimeUtils;

final class JfrLongTaskTimer extends AbstractJfrMeter implements LongTaskTimer {

  private final TimeUnit baseTimeUnit;
  private final LongStatistics statistics;
  private final LongAdder activeTasks;
  private final Clock clock;

  JfrLongTaskTimer(Id id, TimeUnit baseTimeUnit, Clock clock, LongStatisticsFactory longStatisticsFactory) {
    super(id, new LongTaskTimerEventFactory(id, baseTimeUnit));
    this.baseTimeUnit = baseTimeUnit;
    this.clock = clock;
    this.statistics = longStatisticsFactory.newLongStatistics();
    this.activeTasks = new LongAdder();
  }

  @Override
  public HistogramSnapshot takeSnapshot() {
    return HistogramSnapshot.empty(this.statistics.count(), this.duration(this.baseTimeUnit()), this.max(this.baseTimeUnit()));
  }

  @Override
  public Sample start() {
    this.activeTasks.increment();
    JfrLongTaskTimerEvent event = this.newEmptyEvent();
    long start = this.clock.monotonicTime();
    return new JfrSample(event, start);
  }

  void decrementActiveTasks() {
    this.activeTasks.decrement();
  }

  @Override
  public double duration(TimeUnit destinationUnit) {
    long totalAmount = this.statistics.totalAmount();
    return TimeUtils.convert(totalAmount, this.baseTimeUnit(), destinationUnit);
  }

  @Override
  public int activeTasks() {
    return this.activeTasks.intValue();
  }

  @Override
  public double max(TimeUnit destinationUnit) {
    long max = this.statistics.max();
    return TimeUtils.convert(max, this.baseTimeUnit(), destinationUnit);
  }

  @Override
  public TimeUnit baseTimeUnit() {
    return this.baseTimeUnit;
  }

  @Override
  public  T match(Function visitGauge, Function visitCounter, Function visitTimer,
      Function visitSummary, Function visitLongTaskTimer,
      Function visitTimeGauge, Function visitFunctionCounter,
      Function visitFunctionTimer, Function visitMeter) {
    return visitLongTaskTimer.apply(this);
  }

  @Override
  public void use(Consumer visitGauge, Consumer visitCounter, Consumer visitTimer,
      Consumer visitSummary, Consumer visitLongTaskTimer,
      Consumer visitTimeGauge, Consumer visitFunctionCounter,
      Consumer visitFunctionTimer, Consumer visitMeter) {
    visitLongTaskTimer.accept(this);
  }

  final class JfrSample extends Sample {

    private final JfrLongTaskTimerEvent event;
    private final long start;
    private long duration;

    JfrSample(JfrLongTaskTimerEvent event, long start) {
      this.event = event;
      this.start = start;
    }

    @Override
    public long stop() {
      this.event.end();

      long end = JfrLongTaskTimer.this.clock.monotonicTime();
      this.duration = end - this.start;
      this.event.setDuration(this.duration);
      this.event.commit();

      JfrLongTaskTimer.this.decrementActiveTasks();
      return TimeUnit.NANOSECONDS.convert(this.duration, JfrLongTaskTimer.this.baseTimeUnit);
    }

    @Override
    public double duration(TimeUnit unit) {
      return TimeUtils.convert(this.duration, JfrLongTaskTimer.this.baseTimeUnit, unit);
    }

  }

}