org.apache.flink.streaming.api

Interface TimerService

All Known Implementing Classes:

AbstractProcessStreamOperator.ContextImpl, LazyTimerService, SimpleTimerService

@PublicEvolving
public interface TimerService

Interface for working with time and timers.

Field Summary

Fields

Modifier and Type	Field and Description
static String	UNSUPPORTED_DELETE_TIMER_MSG Error string for UnsupportedOperationException on deleting timers.
static String	UNSUPPORTED_REGISTER_TIMER_MSG Error string for UnsupportedOperationException on registering timers.

Method Summary

Modifier and Type	Method and Description
long	currentProcessingTime() Returns the current processing time.
long	currentWatermark() Returns the current event-time watermark.
void	deleteEventTimeTimer(long time) Deletes the event-time timer with the given trigger time.
void	deleteProcessingTimeTimer(long time) Deletes the processing-time timer with the given trigger time.
void	registerEventTimeTimer(long time) Registers a timer to be fired when the event time watermark passes the given time.
void	registerProcessingTimeTimer(long time) Registers a timer to be fired when processing time passes the given time.

Field Detail

UNSUPPORTED_REGISTER_TIMER_MSG

static final String UNSUPPORTED_REGISTER_TIMER_MSG

Error string for UnsupportedOperationException on registering timers.

See Also:

Constant Field Values

UNSUPPORTED_DELETE_TIMER_MSG

static final String UNSUPPORTED_DELETE_TIMER_MSG

Error string for UnsupportedOperationException on deleting timers.

See Also:

Constant Field Values

Method Detail

currentProcessingTime

long currentProcessingTime()

Returns the current processing time.

currentWatermark

long currentWatermark()

Returns the current event-time watermark.

registerProcessingTimeTimer

void registerProcessingTimeTimer(long time)

Registers a timer to be fired when processing time passes the given time.

Timers can internally be scoped to keys and/or windows. When you set a timer in a keyed context, such as in an operation on KeyedStream then that context will also be active when you receive the timer notification.

registerEventTimeTimer

void registerEventTimeTimer(long time)

Registers a timer to be fired when the event time watermark passes the given time.

Timers can internally be scoped to keys and/or windows. When you set a timer in a keyed context, such as in an operation on KeyedStream then that context will also be active when you receive the timer notification.

deleteProcessingTimeTimer

void deleteProcessingTimeTimer(long time)

Deletes the processing-time timer with the given trigger time. This method has only an effect if such a timer was previously registered and did not already expire.

Timers can internally be scoped to keys and/or windows. When you delete a timer, it is removed from the current keyed context.

deleteEventTimeTimer

void deleteEventTimeTimer(long time)

Deletes the event-time timer with the given trigger time. This method has only an effect if such a timer was previously registered and did not already expire.

Timers can internally be scoped to keys and/or windows. When you delete a timer, it is removed from the current keyed context.