Package org.elasticsearch.common.metrics

Class CounterMetric

java.lang.Object

org.elasticsearch.common.metrics.CounterMetric

public final class CounterMetric
extends Object

A CounterMetric is used to track the number of completed and outstanding items, for example, the number of executed refreshes, the currently used memory by indexing, the current pending search requests. In both cases, the current count() is always non-negative.

Constructor Summary

Constructors

Constructor	Description
CounterMetric()

Method Summary

Modifier and Type	Method	Description
long	count()	Returns the current count of this metric.
void	dec()
void	dec(long n)
void	inc()
void	inc(long n)

Methods inherited from class java.lang.Object

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

Constructor Details

CounterMetric

public CounterMetric()

Method Details

inc

public void inc()

inc

public void inc(long n)

dec

public void dec()

dec

public void dec(long n)

count

public long count()

Returns the current count of this metric. The returned value is always non-negative.

As this metric is implemented using a LongAdder, the returned value is NOT an atomic snapshot; invocation in the absence of concurrent updates returns an accurate result, but concurrent updates that occur while the sum is being calculated might not be incorporated.

See Also:

• LongAdder.sum()