How to use org.apache.samza.metrics

 // create a new server listening on port 8000
JmxServer jmxServer = new JmxServer(8000);
// start our server
jmxServer.start();
// register our lookupCache object defined below
jmxServer.register(lookupCache);
jmxServer.register(someOtherObject);
// stop our server
jmxServer.stop();

 public void visit(MetricsVisitor visitor) {
  updateGaugeValues(percentile);
  visitor.gauge(this);
 }
}

/**
 * Default constructor. It uses {@link SlidingTimeWindowReservoir} as the
 * default reservoir.
 *
 * @param name name of this timer
 */
public Timer(String name) {
 this(name, new SlidingTimeWindowReservoir());
}

public <T> Gauge<T> newGauge(String name, final ValueFunction<T> valueFunc) {
 return registry.newGauge(groupName, new Gauge<T>((prefix + name).toLowerCase(), valueFunc.getValue()) {
  @Override
  public T getValue() {
   return valueFunc.getValue();
  }
 });
}

/**
 * Updates the MetricsRegistery of this operator
 * @param startProcessing = begin processing of the message
 * @param endProcessing = end of processing
 */
private void updateMetrics(Instant startProcessing, Instant endProcessing) {
 queryInputEvents.inc();
 processingTime.update(Duration.between(startProcessing, endProcessing).toMillis());
}

public static void incCounter(Counter counter) {
 if (counter != null) {
  counter.inc();
 }
}

public <T> ListGauge<T> newListGauge(String name) {
 return registry.newListGauge(groupName, new ListGauge(name));
}

public static void updateTimer(Timer timer, long duration) {
 if (timer != null) {
  timer.update(duration);
 }
}

 // create a new server listening on port 8000
JmxServer jmxServer = new JmxServer(8000);
jmxServer.start();
// register our lookupCache object defined above
jmxServer.register(lookupCache);

 @Override
 public void run() {
  for (int i = 1; i <= 100; i++) {
   listGauge.add(i);
  }
 }
});

 @Override
 public T getValue() {
  return valueFunc.getValue();
 }
});

 @Override
 public Map<String, Double> getTimerValues(String group, String timer) {
  return getMetricValues(group, timer, "AverageTime");
 }
}

/**
 * {@inheritDoc}
 */
@Override
public void visit(MetricsVisitor visitor) {
 visitor.listGauge(this);
}

public <T> Gauge<T> newGauge(String name, final ValueFunction<T> valueFunc) {
 return registry.newGauge(groupName, new Gauge<T>((prefix + name).toLowerCase(), valueFunc.getValue()) {
  @Override
  public T getValue() {
   return valueFunc.getValue();
  }
 });
}

/**
 * Construct a {@link Timer} with given window size and collision buffer
 *
 * @param name name of this timer
 * @param windowMs the window size. unit is millisecond
 * @param collisionBuffer amount of collisions allowed in one millisecond.
 * @param clock the clock for the reservoir
 */
public Timer(String name, long windowMs, int collisionBuffer, Clock clock) {
 this(name, new SlidingTimeWindowReservoir(windowMs, collisionBuffer, clock));
}

 @Override
 public void run() {
  for (int i = 1; i <= 100; i++) {
   listGauge.add(i);
  }
 }
});

public <T> Gauge<T> newGauge(String name, final ValueFunction<T> valueFunc) {
 return registry.newGauge(groupName, new Gauge<T>((prefix + name).toLowerCase(), valueFunc.getValue()) {
  @Override
  public T getValue() {
   return valueFunc.getValue();
  }
 });
}

/**
 * Construct a {@link Timer} with given window size
 *
 * @param name name of this timer
 * @param windowMs the window size. unit is millisecond
 * @param clock the clock for the reservoir
 */
public Timer(String name, long windowMs, Clock clock) {
 this(name, new SlidingTimeWindowReservoir(windowMs, clock));
}

public <T> Gauge<T> newGauge(String name, final ValueFunction<T> valueFunc) {
 return registry.newGauge(groupName, new Gauge<T>((prefix + name).toLowerCase(), valueFunc.getValue()) {
  @Override
  public T getValue() {
   return valueFunc.getValue();
  }
 });
}

public <T> Gauge<T> newGauge(String name, final ValueFunction<T> valueFunc) {
 return registry.newGauge(groupName, new Gauge<T>((prefix + name).toLowerCase(), valueFunc.getValue()) {
  @Override
  public T getValue() {
   return valueFunc.getValue();
  }
 });
}