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

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package com.github.marschall.micrometer.jfr;

import java.util.function.Function;

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;

final class JfrCounter extends AbstractJfrMeter implements Counter {

  private final AtomicDouble value;

  JfrCounter(Id id) {
    super(id, new CounterEventFactory(id));
    this.value = new AtomicDouble();
  }

  @Override
  public void increment(double amount) {
    // REVIEW, should we validate the value is greater than 0 to make sure it is actually
    // monotonically increasing? No other implementations do this
    double currentValue = this.value.add(amount);

    JfrCounterEvent event = this.newEmptyEvent();
    event.setValues(amount, currentValue);
    event.commit();
  }

  @Override
  public double count() {
    return this.value.doubleValue();
  }

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

}