Timer for VM

Timer.java

package com.collidermodular.util;

public class Timer {
  private final double samplesPerMs;
  private final Runnable runnable;

  private double duration;
  private double sampleCounter;
  private double targetSampleCount;
  private boolean active;
  private boolean loop = false;

  public Timer(double duration, double samplesPerMs, Runnable runnable) {
    this.runnable = runnable;
    this.samplesPerMs = samplesPerMs;
    this.setDuration(duration);
    this.reset();
  }

  public double getDuration() { return this.duration; }

  public double getDurationRemaining() {
    if (this.active) {
      double samplesRem = targetSampleCount - sampleCounter;
      return samplesRem / samplesPerMs;
    } else {
      return 0.0;
    }
  }

  public boolean isActive() { return this.active; }

  public void setDuration(double duration) {
    this.duration = duration;
    this.targetSampleCount = samplesPerMs * duration;
  }

  public void trigger() {
    this.reset();
    this.active = true;
  }

  public void startLoop() {
    this.runnable.run();
    this.loop = true;
    this.trigger();
  }

  public void stopLoop() {
    this.loop = false;
    this.reset();
  }

  public void reset() {
    this.sampleCounter = 0;
    this.active = false;
  }

  public void processSample() {
    if (this.active) {
      this.sampleCounter += 1;

      if (sampleCounter >= targetSampleCount) {
        this.runnable.run();
        if (this.loop) {
          // carry over remainder for more accurate timing between samples
          this.sampleCounter = this.sampleCounter - targetSampleCount;
        } else {
          this.reset();
        }
      }
    }
  }
}