WindowTimerService (Flink : 2.0-SNAPSHOT API)

Type Parameters:

W - Type of the window namespace to which timers are scoped.

All Known Implementing Classes:

SlicingWindowTimerServiceImpl, UnslicingWindowTimerServiceImpl, WindowTimerServiceBase
```
@Internal
public interface WindowTimerService<W>
```
Interface for working with window time and timers which considers timezone for window splitting.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`currentProcessingTime()`	Returns the current processing time.
`long`	`currentWatermark()`	Returns the current event-time watermark.
`ZoneId`	`getShiftTimeZone()`	The shift timezone of the window, if the proctime or rowtime type is TIMESTAMP_LTZ, the shift timezone is the timezone user configured in TableConfig, other cases the timezone is UTC which means never shift when assigning windows.
`void`	`registerEventTimeWindowTimer(W window)`	Registers a window timer to be fired when event time watermark passes the window.
`void`	`registerProcessingTimeWindowTimer(W window)`	Registers a window timer to be fired when processing time passes the window.

- Method Detail
  - getShiftTimeZone
```
ZoneId getShiftTimeZone()
```
    The shift timezone of the window, if the proctime or rowtime type is TIMESTAMP_LTZ, the shift timezone is the timezone user configured in TableConfig, other cases the timezone is UTC which means never shift when assigning windows.
  - currentProcessingTime
```
long currentProcessingTime()
```
    Returns the current processing time.
  - currentWatermark
```
long currentWatermark()
```
    Returns the current event-time watermark.
  - registerProcessingTimeWindowTimer
```
void registerProcessingTimeWindowTimer(W window)
```
    Registers a window timer to be fired when processing time passes the window. The window you pass here will be provided when the timer fires.
  - registerEventTimeWindowTimer
```
void registerEventTimeWindowTimer(W window)
```
    Registers a window timer to be fired when event time watermark passes the window. The window you pass here will be provided when the timer fires.