com.google.cloud.dataflow.sdk.util

Class AttemptBoundedExponentialBackOff

java.lang.Object

com.google.cloud.dataflow.sdk.util.AttemptBoundedExponentialBackOff

All Implemented Interfaces:

com.google.api.client.util.BackOff

Direct Known Subclasses:

AttemptAndTimeBoundedExponentialBackOff

public class AttemptBoundedExponentialBackOff
extends Object
implements com.google.api.client.util.BackOff

Implementation of BackOff that increases the back off period for each retry attempt using a randomization function that grows exponentially.

Example: The initial interval is .5 seconds and the maximum number of retries is 10. For 10 tries the sequence will be (values in seconds):

   retry#      retry_interval     randomized_interval
   1             0.5                [0.25,   0.75]
   2             0.75               [0.375,  1.125]
   3             1.125              [0.562,  1.687]
   4             1.687              [0.8435, 2.53]
   5             2.53               [1.265,  3.795]
   6             3.795              [1.897,  5.692]
   7             5.692              [2.846,  8.538]
   8             8.538              [4.269, 12.807]
   9            12.807              [6.403, 19.210]
   10           BackOff.STOP
 

Implementation is not thread-safe.

Field Summary

Fields

Modifier and Type	Field and Description
static double	DEFAULT_MULTIPLIER
static double	DEFAULT_RANDOMIZATION_FACTOR

Fields inherited from interface com.google.api.client.util.BackOff

STOP, STOP_BACKOFF, ZERO_BACKOFF

Constructor Summary

Constructors

Constructor and Description
AttemptBoundedExponentialBackOff(int maximumNumberOfAttempts, long initialIntervalMillis)

Method Summary

Modifier and Type	Method and Description
boolean	atMaxAttempts()
long	nextBackOffMillis()
void	reset()

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MULTIPLIER

public static final double DEFAULT_MULTIPLIER

See Also:

Constant Field Values

DEFAULT_RANDOMIZATION_FACTOR

public static final double DEFAULT_RANDOMIZATION_FACTOR

See Also:

Constant Field Values

Constructor Detail

AttemptBoundedExponentialBackOff

public AttemptBoundedExponentialBackOff(int maximumNumberOfAttempts,
                                        long initialIntervalMillis)

Method Detail

reset

public void reset()

Specified by:

reset in interface com.google.api.client.util.BackOff

nextBackOffMillis

public long nextBackOffMillis()

Specified by:

nextBackOffMillis in interface com.google.api.client.util.BackOff

atMaxAttempts

public boolean atMaxAttempts()