com.amazonaws.services.simpleworkflow.flow.worker
Class BackoffThrottler

java.lang.Object
  com.amazonaws.services.simpleworkflow.flow.worker.BackoffThrottler

public class BackoffThrottler
extends Object

Used to throttle code execution in presence of failures using exponential backoff logic. The formula used to calculate the next sleep interval is:

 min(pow(backoffCoefficient, failureCount - 1) * initialSleep, maxSleep);
 

Example usage:

 BackoffThrottler throttler = new BackoffThrottler(1000, 60000, 2);
 while(!stopped) {
     try {
         throttler.throttle();
         // some code that can fail and should be throttled
         ...
         throttler.success();
     }
     catch (Exception e) {
         throttler.failure();
     }
 }
 

Constructor Summary

BackoffThrottler(long initialSleep, long maxSleep, double backoffCoefficient)
Construct an instance of the throttler.

Method Summary

void	failure() Increment failure count.
void	success() Resent failure count to 0.
void	throttle() Sleep if there were failures since the last success call.

Methods inherited from class java.lang.Object

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

Constructor Detail

BackoffThrottler

public BackoffThrottler(long initialSleep,
                        long maxSleep,
                        double backoffCoefficient)

Construct an instance of the throttler.

Parameters:

initialSleep - time to sleep on the first failure

maxSleep - maximum time to sleep independently of number of failures

backoffCoefficient - coefficient used to calculate the next time to sleep.

Method Detail

throttle

public void throttle()
              throws InterruptedException

Sleep if there were failures since the last success call.

Throws:

InterruptedException

success

public void success()

Resent failure count to 0.

failure

public void failure()

Increment failure count.