Package org.nustaq.kontraktor.impl

Class BackOffStrategy

java.lang.Object

org.nustaq.kontraktor.impl.BackOffStrategy

public class BackOffStrategy
extends Object

Created by moelrue on 06.05.2014. Kontraktor uses spinlocking. By adjusting the backofstrategy values one can define the tradeoff regarding latency/idle CPU load. if a message queue is empty, first busy spin is used for N iterations, then Thread.all, then LockSupport.park, then sleep(nanosToPark) Note that default constants are public static, so one can globally trade higher latency against lower cpu (polling) load

Field Summary

Fields

Modifier and Type	Field	Description
static int	PARK_UNTIL_SLEEP
static int	SLEEP_NANOS
static int	SPIN_UNTIL_YIELD
static int	YIELD_UNTIL_PARK

Constructor Summary

Constructors

Constructor	Description
BackOffStrategy()
BackOffStrategy(int spinUntilYield, int yieldUntilPark, int parkUntilSleep)

Method Summary

Modifier and Type	Method	Description
int	getNanosToPark()
boolean	isSleeping(int yieldCount)
boolean	isYielding(int count)
void	kYield(int count)
void	setCounters(int spinUntilYield, int yieldUntilPark, int parkUntilSleep)
BackOffStrategy	setNanosToPark(int nanosToPark)

Methods inherited from class java.lang.Object

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

Field Details

SLEEP_NANOS

public static int SLEEP_NANOS

SPIN_UNTIL_YIELD

public static int SPIN_UNTIL_YIELD

YIELD_UNTIL_PARK

public static int YIELD_UNTIL_PARK

PARK_UNTIL_SLEEP

public static int PARK_UNTIL_SLEEP

Constructor Details

BackOffStrategy

public BackOffStrategy()

BackOffStrategy

public BackOffStrategy(int spinUntilYield,
 int yieldUntilPark,
 int parkUntilSleep)

Parameters:

spinUntilYield - - number of busy spins until Thread.yield is used

yieldUntilPark - - number of Thread.yield iterations until parkNanos(1) is used

parkUntilSleep - - number of parkNanos(1) is used until park(nanosToPark) is used. Default for nanosToPark is 0.5 milliseconds

Method Details

setCounters

public void setCounters(int spinUntilYield,
 int yieldUntilPark,
 int parkUntilSleep)

getNanosToPark

public int getNanosToPark()

setNanosToPark

public BackOffStrategy setNanosToPark(int nanosToPark)

kYield

public void kYield(int count)

isSleeping

public boolean isSleeping(int yieldCount)

isYielding

public boolean isYielding(int count)