org.apache.flink.streaming.api.windowing.triggers

Interface Trigger.TriggerContext

All Known Implementing Classes:

NonKeyedWindowOperator.Context, WindowOperator.Context

Enclosing interface:

Trigger<T,W extends Window>

public static interface Trigger.TriggerContext

A context object that is given to Trigger methods to allow them to register timer callbacks and deal with state.

Method Summary

Methods

Modifier and Type	Method and Description
<S extends Serializable> OperatorState<S>	getKeyValueState(String name, S defaultState) Retrieves an OperatorState object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.
void	registerEventTimeTimer(long time) Register an event-time callback.
void	registerProcessingTimeTimer(long time) Register a system time callback.

Method Detail

registerProcessingTimeTimer

void registerProcessingTimeTimer(long time)

Register a system time callback. When the current system time passes the specified time Trigger.onProcessingTime(long, Window, TriggerContext) is called with the time specified here.

Parameters:

time - The time at which to invoke Trigger.onProcessingTime(long, Window, TriggerContext)

registerEventTimeTimer

void registerEventTimeTimer(long time)

Register an event-time callback. When the current watermark passes the specified time Trigger.onEventTime(long, Window, TriggerContext) is called with the time specified here.

Parameters:

time - The watermark at which to invoke Trigger.onEventTime(long, Window, TriggerContext)

See Also:

Watermark

getKeyValueState

<S extends Serializable> OperatorState<S> getKeyValueState(String name,
                                                         S defaultState)

Retrieves an OperatorState object that can be used to interact with fault-tolerant state that is scoped to the window and key of the current trigger invocation.

Parameters:

name - A unique key for the state.

defaultState - The default value of the state.