com.google.cloud.tools.jib.cache

Class Retry<E extends Exception>

java.lang.Object

com.google.cloud.tools.jib.cache.Retry<E>

Type Parameters:

E - the class of exceptions that may be thrown

public class Retry<E extends Exception>
extends Object

Retries an action until it succeeds, or has retried too often and failed. By default the action will be run up to 5 times. The action is deemed successful if it runs to completion without throwing an exception, and returns true.

• Exceptions are caught and, if deemed retryable then the action will be re-attempted. By default, any exception is considered retryable.
• The retry instance can be configured to sleep between retries.
• The maximum retry count is configurable (5 times by default).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Retry.Action<E extends Exception> A runnable action that may throw an exception of type E.

Method Summary

Modifier and Type	Method and Description
static <E extends Exception> Retry<E>	action(Retry.Action<E> action) Create a retryable action.
Retry<E>	maximumRetries(int maximumRetries)
Retry<E>	retryOnException(Predicate<Exception> retryOnException) Provide a predicate to determine if a thrown exception can be retried.
boolean	run() Run the action until it runs successfully, to a maximum number of retries (default: 5).
Retry<E>	sleep(long duration, TimeUnit unit) Set the sleep time between retries.

Methods inherited from class java.lang.Object

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

Method Detail

action

public static <E extends Exception> Retry<E> action(Retry.Action<E> action)

Create a retryable action.

Type Parameters:

E - the class of exceptions that may be thrown

Parameters:

action - the action to be run

Returns:

the instance

maximumRetries

public Retry<E> maximumRetries(int maximumRetries)

retryOnException

public Retry<E> retryOnException(Predicate<Exception> retryOnException)

Provide a predicate to determine if a thrown exception can be retried.

Parameters:

retryOnException - determine if provided exception is retryable.

Returns:

the instance for further configuration

sleep

public Retry<E> sleep(long duration,
                      TimeUnit unit)

Set the sleep time between retries.

Parameters:

duration - the time to sleep

unit - the unit of time of duration

Returns:

the instance for further configuration

run

public boolean run()
            throws E extends Exception

Run the action until it runs successfully, to a maximum number of retries (default: 5). If an exception occurs then the action will be retried providing the exception is retryable.

Returns:

true if the action was run successfully, or false if the action was unable to complete

Throws:

E - exception thrown during the action

E extends Exception