com.sleepycat.utilint

Class StatsTracker<T>

java.lang.Object

com.sleepycat.utilint.StatsTracker<T>

public class StatsTracker<T>
extends Object

Maintain interval and cumulative stats for a given set of operations, as well as a activityCounter that generates thread dumps if operations take too long. The markStart and markFinish methods can be used to bracket each tracked operation.

Constructor Summary

Constructors

Constructor and Description
StatsTracker(T[] opTypes, Logger stackTraceLogger, int activeThreadThreshold, long threadDumpIntervalMillis, int threadDumpMax, int maxTrackedLatencyMillis) The logger is used for activity stack traces.

Method Summary

Modifier and Type	Method and Description
void	clearLatency() Should be called after each interval latency stat collection, to reset for the next period's collection.
Map<T,LatencyStat>	getCumulativeLatency()
Map<T,LatencyStat>	getIntervalLatency()
int	getNumCompletedDumps() For unit test support.
void	markFinish(T opType, long startTime) Track the end of an operation.
void	markFinish(T opType, long startTime, int numOperations) Track the end of an operation.
long	markStart() Track the start of a operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

StatsTracker

public StatsTracker(T[] opTypes,
                    Logger stackTraceLogger,
                    int activeThreadThreshold,
                    long threadDumpIntervalMillis,
                    int threadDumpMax,
                    int maxTrackedLatencyMillis)

The logger is used for activity stack traces.

Method Detail

markStart

public long markStart()

Track the start of a operation.

Returns:

the value of System.nanoTime, for passing to markFinish.

markFinish

public void markFinish(T opType,
                       long startTime)

Track the end of an operation.

Parameters:

startTime - should be the value returned by the corresponding call to markStart

markFinish

public void markFinish(T opType,
                       long startTime,
                       int numOperations)

Track the end of an operation.

Parameters:

startTime - should be the value returned by the corresponding call to markStart

clearLatency

public void clearLatency()

Should be called after each interval latency stat collection, to reset for the next period's collection.

getIntervalLatency

public Map<T,LatencyStat> getIntervalLatency()

getCumulativeLatency

public Map<T,LatencyStat> getCumulativeLatency()

getNumCompletedDumps

public int getNumCompletedDumps()

For unit test support.