org.apache.flink.state.api.runtime

Class NeverFireProcessingTimeService

java.lang.Object

org.apache.flink.state.api.runtime.NeverFireProcessingTimeService

All Implemented Interfaces:

ProcessingTimeService, TimerService

@Internal
public final class NeverFireProcessingTimeService
extends Object
implements TimerService

A processing time service whose timers never fire so all timers are included in savepoints.

Constructor Summary

Constructors

Constructor and Description
NeverFireProcessingTimeService()

Method Summary

Modifier and Type	Method and Description
void	awaitPendingAfterQuiesce() This method can be used after calling TimerService.quiesce(), and awaits the completion of currently executing timers.
long	getCurrentProcessingTime() Returns the current processing time.
boolean	isTerminated() Returns true if the service has been shut down, false otherwise.
void	quiesce() This method puts the service into a state where it does not register new timers, but returns for each call to ProcessingTimeService.registerTimer(long, ProcessingTimeCallback) only a "mock" future.
ScheduledFuture<?>	registerTimer(long timestamp, ProcessingTimeCallback target) Registers a task to be executed when (processing) time is timestamp.
ScheduledFuture<?>	scheduleAtFixedRate(ProcessingTimeCallback callback, long initialDelay, long period) Registers a task to be executed repeatedly at a fixed rate.
void	shutdownService() Shuts down and clean up the timer service provider hard and immediately.
boolean	shutdownServiceUninterruptible(long timeoutMs) Shuts down and clean up the timer service provider hard and immediately.

Methods inherited from class java.lang.Object

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

Constructor Detail

NeverFireProcessingTimeService

public NeverFireProcessingTimeService()

Method Detail

getCurrentProcessingTime

public long getCurrentProcessingTime()

Description copied from interface: ProcessingTimeService

Returns the current processing time.

Specified by:

getCurrentProcessingTime in interface ProcessingTimeService

registerTimer

public ScheduledFuture<?> registerTimer(long timestamp,
                                        ProcessingTimeCallback target)

Description copied from interface: ProcessingTimeService

Registers a task to be executed when (processing) time is timestamp.

Specified by:

registerTimer in interface ProcessingTimeService

Parameters:

timestamp - Time when the task is to be executed (in processing time)

target - The task to be executed

Returns:

The future that represents the scheduled task. This always returns some future, even if the timer was shut down

scheduleAtFixedRate

public ScheduledFuture<?> scheduleAtFixedRate(ProcessingTimeCallback callback,
                                              long initialDelay,
                                              long period)

Description copied from interface: ProcessingTimeService

Registers a task to be executed repeatedly at a fixed rate.

Specified by:

scheduleAtFixedRate in interface ProcessingTimeService

Parameters:

callback - to be executed after the initial delay and then after each period

initialDelay - initial delay to start executing callback

period - after the initial delay after which the callback is executed

Returns:

Scheduled future representing the task to be executed repeatedly

isTerminated

public boolean isTerminated()

Description copied from interface: TimerService

Returns true if the service has been shut down, false otherwise.

Specified by:

isTerminated in interface TimerService

quiesce

public void quiesce()
             throws InterruptedException

Description copied from interface: TimerService

This method puts the service into a state where it does not register new timers, but returns for each call to ProcessingTimeService.registerTimer(long, ProcessingTimeCallback) only a "mock" future. Furthermore, the method clears all not yet started timers.

This method can be used to cleanly shut down the timer service. The using components will not notice that the service is shut down (as for example via exceptions when registering a new timer), but the service will simply not fire any timer any more.

Specified by:

quiesce in interface TimerService

Throws:

InterruptedException

awaitPendingAfterQuiesce

public void awaitPendingAfterQuiesce()
                              throws InterruptedException

Description copied from interface: TimerService

This method can be used after calling TimerService.quiesce(), and awaits the completion of currently executing timers.

Specified by:

awaitPendingAfterQuiesce in interface TimerService

Throws:

InterruptedException

shutdownService

public void shutdownService()

Description copied from interface: TimerService

Shuts down and clean up the timer service provider hard and immediately. This does not wait for any timer to complete. Any further call to ProcessingTimeService.registerTimer(long, ProcessingTimeCallback) will result in a hard exception.

Specified by:

shutdownService in interface TimerService

shutdownServiceUninterruptible

public boolean shutdownServiceUninterruptible(long timeoutMs)

Description copied from interface: TimerService

Shuts down and clean up the timer service provider hard and immediately. This does not wait for any timer to complete. Any further call to ProcessingTimeService.registerTimer(long, ProcessingTimeCallback) will result in a hard exception. This call cannot be interrupted and will block until the shutdown is completed or the timeout is exceeded.

Specified by:

shutdownServiceUninterruptible in interface TimerService

Parameters:

timeoutMs - timeout for blocking on the service shutdown in milliseconds.

Returns:

returns true iff the shutdown was completed.