org.apache.ignite.spi

Class ExponentialBackoffTimeoutStrategy

java.lang.Object

org.apache.ignite.spi.ExponentialBackoffTimeoutStrategy

All Implemented Interfaces:

TimeoutStrategy

public class ExponentialBackoffTimeoutStrategy
extends Object
implements TimeoutStrategy

Strategy which incorporates retriable network operation, handling of totalTimeout logic. It increases startTimeout based on exponential backoff algorithm. If failure detection is enabled it relies on totalTimeout otherwise implements exponential backoff totalTimeout logic based on startTimeout, maxTimeout and retryCnt.

Constructor Summary

Constructors

Constructor and Description
ExponentialBackoffTimeoutStrategy(long totalTimeout, long startTimeout, long maxTimeout)

Method Summary

Modifier and Type	Method and Description
static long	backoffTimeout(long timeout, long maxTimeout)
boolean	checkTimeout(long timeInFut) Check if total timeout will be reached in now() + timeInFut.
long	nextTimeout(long timeout) Get next timeout based on previously timeout calculated by strategy.
String	toString()
static long	totalBackoffTimeout(long initTimeout, long maxTimeout, long reconCnt) Compute expected max backoff timeout based on initTimeout, maxTimeout and reconCnt and backoff coefficient.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.ignite.spi.TimeoutStrategy

checkTimeout, nextTimeout

Constructor Detail

ExponentialBackoffTimeoutStrategy

public ExponentialBackoffTimeoutStrategy(long totalTimeout,
                                         long startTimeout,
                                         long maxTimeout)

Parameters:

totalTimeout - Total startTimeout.

startTimeout - Initial connection timeout.

maxTimeout - Max connection Timeout.

Method Detail

totalBackoffTimeout

public static long totalBackoffTimeout(long initTimeout,
                                       long maxTimeout,
                                       long reconCnt)

Compute expected max backoff timeout based on initTimeout, maxTimeout and reconCnt and backoff coefficient.

Parameters:

initTimeout - Initial timeout.

maxTimeout - Max Timeout per retry.

reconCnt - Reconnection count.

Returns:

Calculated total backoff timeout.

backoffTimeout

public static long backoffTimeout(long timeout,
                                  long maxTimeout)

Parameters:

timeout - Timeout.

maxTimeout - Maximum startTimeout for backoff function.

Returns:

Next exponential backoff timeout.

nextTimeout

public long nextTimeout(long timeout)
                 throws IgniteSpiOperationTimeoutException

Get next timeout based on previously timeout calculated by strategy.

Specified by:

nextTimeout in interface TimeoutStrategy

Parameters:

timeout - Current timeout value that is used to calculate the next one.

Returns:

Gets next timeout.

Throws:

IgniteSpiOperationTimeoutException - in case of total timeout already breached.

checkTimeout

public boolean checkTimeout(long timeInFut)

Check if total timeout will be reached in now() + timeInFut. If timeInFut is 0, will check that timeout already reached.

Specified by:

checkTimeout in interface TimeoutStrategy

Parameters:

timeInFut - Some millis in future.

Returns:

True if total timeout will be reached.

toString

public String toString()

Overrides:

toString in class Object