com.netflix.genie.web.util

Class ExponentialBackOffTrigger

java.lang.Object

com.netflix.genie.web.util.ExponentialBackOffTrigger

All Implemented Interfaces:

org.springframework.scheduling.Trigger

@ThreadSafe
public class ExponentialBackOffTrigger
extends java.lang.Object
implements org.springframework.scheduling.Trigger

Trigger implementation whose scheduling delay grows exponentially based on a given factor. The delay is bound between some minimum and maximum. The delay can be relative to the previous task scheduling/execution/completion.

Since:

3.3.9

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExponentialBackOffTrigger.DelayType How the delay is calculated.

Constructor Summary

Constructors

Constructor and Description
ExponentialBackOffTrigger(ExponentialBackOffTrigger.DelayType delayType, long minDelay, long maxDelay, float factor) Constructor.

Method Summary

Modifier and Type	Method and Description
java.util.Date	nextExecutionTime(org.springframework.scheduling.TriggerContext triggerContext)
void	reset() Reset the delay to the minimum given at construction time.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExponentialBackOffTrigger

public ExponentialBackOffTrigger(ExponentialBackOffTrigger.DelayType delayType,
                                 long minDelay,
                                 long maxDelay,
                                 float factor)

Constructor.

Parameters:

delayType - type of delay

minDelay - minimum delay in milliseconds

maxDelay - maximum delay in milliseconds

factor - multiplier factor to grow the delay

Throws:

java.lang.IllegalArgumentException - if the minimum delay is smaller than 1, the max delay is smaller than the minimum, or the factor is not positive.

Method Detail

nextExecutionTime

public java.util.Date nextExecutionTime(org.springframework.scheduling.TriggerContext triggerContext)

Specified by:

nextExecutionTime in interface org.springframework.scheduling.Trigger

reset

public void reset()

Reset the delay to the minimum given at construction time. Example usage: if the trigger is used to slow down attempt to contact a remote service in case of error, then a successful request can invoke reset, ensuring the next attempt will not be delayed.