RetryStrategy

All Implemented Interfaces:
```
public class RetryStrategy

                    
```
A retry strategy for doing some job. It allows to specify initial delay before the task is started as well as retry delay. It will be executed as long as the task Callable returns true. It is also possible to configure whether the retries should be continued after unexpected exception or not. If we decide to not continue retries from outside the task cancel method will prevent from scheduling future retries(but it will not interrupt currently executing one). Check with isCancelled to stop the operation in progress. See "RetryStrategyTest" for usage samples.

Author:

Pawel Domas

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description

Field Summary

Fields
Modifier and Type	Field	Description

Constructor Summary

Constructors
Constructor	Description
`RetryStrategy()`	Creates new RetryStrategy instance that will use ScheduledExecutorService with pool size of 1 thread to schedule retry attempts.
`RetryStrategy(ScheduledExecutorService retryExecutor)`	Creates new instance of RetryStrategy that will use given ScheduledExecutorService to schedule retry attempts.

Enum Constant Summary

Enum Constants
Enum Constant	Description

Method Summary

Modifier and Type	Method	Description
`synchronized void`	`cancel()`	Cancels any future retry attempts.
`synchronized boolean`	`isCancelled()`	Returns true if this retry strategy has been cancelled or false otherwise.
`synchronized void`	`runRetryingTask(RetryTask task)`	Start given RetryTask that will be executed for the first time after getInitialDelay.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - RetryStrategy
```
RetryStrategy()
```
    Creates new RetryStrategy instance that will use ScheduledExecutorService with pool size of 1 thread to schedule retry attempts.
  - RetryStrategy
```
RetryStrategy(ScheduledExecutorService retryExecutor)
```
    Creates new instance of RetryStrategy that will use given ScheduledExecutorService to schedule retry attempts.
    
    Parameters:
    
    retryExecutor - ScheduledExecutorService that will be used for scheduling retry attempts.
- Method Detail
  - cancel
```
 synchronized void cancel()
```
    Cancels any future retry attempts. Currently running tasks are not interrupted.
  - isCancelled
```
 synchronized boolean isCancelled()
```
    Returns true if this retry strategy has been cancelled or false otherwise.
  - runRetryingTask
```
 synchronized void runRetryingTask(RetryTask task)
```
    Start given RetryTask that will be executed for the first time after getInitialDelay. After first execution next retry attempts will be rescheduled as long as it's callable method returns true or until (cancel is called.
    
    Parameters:
    
    task - the retry task to be employed by this retry strategy instance