Package org.apache.flink.runtime.metrics

Class ThresholdMeter

java.lang.Object

org.apache.flink.runtime.metrics.ThresholdMeter

All Implemented Interfaces:

Meter, Metric

public class ThresholdMeter
extends Object
implements Meter

A timestamp queue based threshold meter.

Note: This class is thread safe, at the price of synchronization overhead. Do not use this in performance sensitive scenarios, e.g., per-record updated metrics.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ThresholdMeter.ThresholdExceedException	Exception thrown when a threshold exceeds.

Constructor Summary

Constructors

Constructor	Description
ThresholdMeter(double maxEventsPerInterval, Duration interval)
ThresholdMeter(double maxEventsPerInterval, Duration interval, Clock clock)

Method Summary

Modifier and Type	Method	Description
void	checkAgainstThreshold()
long	getCount()	Get number of events marked on the meter.
double	getRate()	Returns the current rate of events per second.
void	markEvent()	Mark occurrence of an event.
void	markEvent(long n)	Mark occurrence of multiple events.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.metrics.Meter

getMetricType

Constructor Detail

ThresholdMeter

public ThresholdMeter(double maxEventsPerInterval,
                      Duration interval)

ThresholdMeter

@VisibleForTesting
public ThresholdMeter(double maxEventsPerInterval,
                      Duration interval,
                      Clock clock)

Method Detail

markEvent

public void markEvent()

Description copied from interface: Meter

Mark occurrence of an event.

Specified by:

markEvent in interface Meter

markEvent

public void markEvent(long n)

Description copied from interface: Meter

Mark occurrence of multiple events.

Specified by:

markEvent in interface Meter

Parameters:

n - number of events occurred

getRate

public double getRate()

Description copied from interface: Meter

Returns the current rate of events per second.

Specified by:

getRate in interface Meter

Returns:

current rate of events per second

getCount

public long getCount()

Description copied from interface: Meter

Get number of events marked on the meter.

Specified by:

getCount in interface Meter

Returns:

number of events marked on the meter

checkAgainstThreshold

public void checkAgainstThreshold()
                           throws ThresholdMeter.ThresholdExceedException

Throws:

ThresholdMeter.ThresholdExceedException