com.google.apphosting.runtime.timer

Class TimerFactory

java.lang.Object

com.google.apphosting.runtime.timer.TimerFactory

public class TimerFactory
extends Object

TimerFactory creates new Timer instances.

Constructor Summary

Constructors

Constructor and Description
TimerFactory(long cyclesPerSecond, TimerSet... timerSets) Create a TimerFactory.

Method Summary

Modifier and Type	Method and Description
Timer	getCpuCycleTimer(Thread thread) Return a Timer that counts CPU time for the specified Thread.
CpuRatioTimer	getCpuRatioTimer(Thread thread) Returns a CpuRatioTimer that tracks both the CPU usage of the specified Thread and the wallclock time.
CpuRatioTimer	getCpuRatioTimer(ThreadGroup threadGroup) Returns a CpuRatioTimer that tracks both the CPU usage of the specified ThreadGroup and the wallclock time.
Timer	getThreadGroupCpuTimer(ThreadGroup threadGroup)
Timer	getWallclockTimer() Return a Timer that counts wallclock time.

Methods inherited from class java.lang.Object

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

Constructor Detail

TimerFactory

public TimerFactory(long cyclesPerSecond,
                    TimerSet... timerSets)

Create a TimerFactory.

Parameters:

cyclesPerSecond - Speed of the processor in clock cycles per second

timerSets - Zero or more TimerSet instances that will become additional timers associated with the returned CpuRatioTimer. This is useful for tracking CPU usage outside of a request thread, such as hotspot or GC.

Method Detail

getWallclockTimer

public Timer getWallclockTimer()

Return a Timer that counts wallclock time.

getCpuCycleTimer

public Timer getCpuCycleTimer(Thread thread)

Return a Timer that counts CPU time for the specified Thread.

Throws:

UnsupportedOperationException - If no CPU timer is available.

getThreadGroupCpuTimer

public Timer getThreadGroupCpuTimer(ThreadGroup threadGroup)

getCpuRatioTimer

public CpuRatioTimer getCpuRatioTimer(Thread thread)

Returns a CpuRatioTimer that tracks both the CPU usage of the specified Thread and the wallclock time.

Throws:

UnsupportedOperationException - If thread CPU timing is not available.

getCpuRatioTimer

public CpuRatioTimer getCpuRatioTimer(ThreadGroup threadGroup)

Returns a CpuRatioTimer that tracks both the CPU usage of the specified ThreadGroup and the wallclock time.

Throws:

UnsupportedOperationException - If thread CPU timing is not available.