com.librato.metrics

Class DeltaTracker

java.lang.Object

com.librato.metrics.DeltaTracker

public class DeltaTracker
extends Object

Tracks the last named value.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	DeltaTracker.MetricSupplier

Constructor Summary

Constructors

Constructor and Description
DeltaTracker()
DeltaTracker(DeltaTracker.MetricSupplier supplier)

Method Summary

Methods

Modifier and Type	Method and Description
Long	getDelta(String name, long count) Calculates the delta.
Long	peekDelta(String name, long count) Gets the delta without updating the internal data store

Methods inherited from class java.lang.Object

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

Constructor Detail

DeltaTracker

public DeltaTracker()

DeltaTracker

public DeltaTracker(DeltaTracker.MetricSupplier supplier)

Method Detail

peekDelta

public Long peekDelta(String name,
             long count)

Gets the delta without updating the internal data store

getDelta

public Long getDelta(String name,
            long count)

Calculates the delta. If this is a new value that has not been seen before, zero will be assumed to be the initial value. Updates the internal map with the supplied count.

Parameters:

name - the name of the counter

count - the counter value

Returns:

the delta