org.apache.flink.streaming.runtime.tasks

类 SystemProcessingTimeService

java.lang.Object

org.apache.flink.streaming.runtime.tasks.SystemProcessingTimeService

所有已实现的接口:

ProcessingTimeService, TimerService

@Internal
public class SystemProcessingTimeService
extends Object
implements TimerService

A TimerService which assigns as current processing time the result of calling System.currentTimeMillis() and registers timers using a ScheduledThreadPoolExecutor.

方法概要

限定符和类型	方法和说明
protected void	finalize()
long	getCurrentProcessingTime() Returns the current processing time.
boolean	isTerminated() Returns true if the service has been shut down, false otherwise.
CompletableFuture<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, org.apache.flink.streaming.runtime.tasks.ProcessingTimeCallback) or ProcessingTimeService.scheduleAtFixedRate(org.apache.flink.streaming.runtime.tasks.ProcessingTimeCallback, long, long) a "mock" future and the "mock" future will be never completed.
ScheduledFuture<?>	registerTimer(long timestamp, ProcessingTimeCallback callback) Registers a task to be executed no sooner than time timestamp, but without strong guarantees of order.
ScheduledFuture<?>	scheduleAtFixedRate(ProcessingTimeCallback callback, long initialDelay, long period) Registers a task to be executed repeatedly at a fixed rate.
ScheduledFuture<?>	scheduleWithFixedDelay(ProcessingTimeCallback callback, long initialDelay, long period) Registers a task to be executed repeatedly with a fixed delay.
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.

从类继承的方法 java.lang.Object

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

方法详细资料

getCurrentProcessingTime

public long getCurrentProcessingTime()

从接口复制的说明: ProcessingTimeService

Returns the current processing time.

指定者:

getCurrentProcessingTime 在接口中 ProcessingTimeService

registerTimer

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

Registers a task to be executed no sooner than time timestamp, but without strong guarantees of order.

指定者:

registerTimer 在接口中 ProcessingTimeService

参数:

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

callback - The task to be executed

返回:

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)

从接口复制的说明: ProcessingTimeService

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

This call behaves similar to ScheduledExecutor.scheduleAtFixedRate(Runnable, long, long, TimeUnit).

指定者:

scheduleAtFixedRate 在接口中 ProcessingTimeService

参数:

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

返回:

Scheduled future representing the task to be executed repeatedly

scheduleWithFixedDelay

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

从接口复制的说明: ProcessingTimeService

Registers a task to be executed repeatedly with a fixed delay.

This call behaves similar to ScheduledExecutor.scheduleWithFixedDelay(Runnable, long, long, TimeUnit).

指定者:

scheduleWithFixedDelay 在接口中 ProcessingTimeService

参数:

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

返回:

Scheduled future representing the task to be executed repeatedly

isTerminated

public boolean isTerminated()

从接口复制的说明: TimerService

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

指定者:

isTerminated 在接口中 TimerService

quiesce

public CompletableFuture<Void> quiesce()

从接口复制的说明: ProcessingTimeService

This method puts the service into a state where it does not register new timers, but returns for each call to ProcessingTimeService.registerTimer(long, org.apache.flink.streaming.runtime.tasks.ProcessingTimeCallback) or ProcessingTimeService.scheduleAtFixedRate(org.apache.flink.streaming.runtime.tasks.ProcessingTimeCallback, long, long) a "mock" future and the "mock" future will be never completed. Furthermore, the timers registered before are prevented from firing, but the timers in running are allowed to finish.

If no timer is running, the quiesce-completed future is immediately completed and returned. Otherwise, the future returned will be completed when all running timers have finished.

指定者:

quiesce 在接口中 ProcessingTimeService

shutdownService

public void shutdownService()

从接口复制的说明: 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.

指定者:

shutdownService 在接口中 TimerService

shutdownServiceUninterruptible

public boolean shutdownServiceUninterruptible(long timeoutMs)

从接口复制的说明: 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.

指定者:

shutdownServiceUninterruptible 在接口中 TimerService

参数:

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

返回:

returns true iff the shutdown was completed.

finalize

protected void finalize()
                 throws Throwable

覆盖:

finalize 在类中 Object

抛出:

Throwable