org.apache.lens.server.api.common

Class FibonacciExponentialBackOffRetryHandler

java.lang.Object

org.apache.lens.server.api.common.FibonacciExponentialBackOffRetryHandler

All Implemented Interfaces:

BackOffRetryHandler

public class FibonacciExponentialBackOffRetryHandler
extends Object
implements BackOffRetryHandler

A exponential backoff retry handler. It allows the the failures to be retried at a next update time, which can increase exponentially.

Constructor Summary

Constructors

Constructor and Description
FibonacciExponentialBackOffRetryHandler(int numRetries, long maxDelay, long waitMillis)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	canTryOpNow(FailureContext failContext) To know whether operation can be done now.
long	getOperationNextTime(FailureContext failContext) Get the time when the operation can be done next.
boolean	hasExhaustedRetries(FailureContext failContext) Has the operation exhausted all its retries

Methods inherited from class java.lang.Object

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

Constructor Detail

FibonacciExponentialBackOffRetryHandler

public FibonacciExponentialBackOffRetryHandler(int numRetries,
                                       long maxDelay,
                                       long waitMillis)

Method Detail

canTryOpNow

public boolean canTryOpNow(FailureContext failContext)

Description copied from interface: BackOffRetryHandler

To know whether operation can be done now.

Specified by:

canTryOpNow in interface BackOffRetryHandler

Parameters:

failContext - FailureContext holding failures till now.

Returns:

true if operation can be done now, false otherwise.

getOperationNextTime

public long getOperationNextTime(FailureContext failContext)

Description copied from interface: BackOffRetryHandler

Get the time when the operation can be done next.

Specified by:

getOperationNextTime in interface BackOffRetryHandler

Parameters:

failContext - FailureContext holding failures till now.

Returns:

Next operation time in millis since epoch

hasExhaustedRetries

public boolean hasExhaustedRetries(FailureContext failContext)

Description copied from interface: BackOffRetryHandler

Has the operation exhausted all its retries

Specified by:

hasExhaustedRetries in interface BackOffRetryHandler

Parameters:

failContext - FailureContext holding failures till now.

Returns:

true if all retries have exhausted, false otherwise.