org.apache.flink.table.runtime.operators.window.slicing

类 SliceAssigners.SlicedSharedSliceAssigner

java.lang.Object

org.apache.flink.table.runtime.operators.window.slicing.SliceAssigners.SlicedSharedSliceAssigner

所有已实现的接口:

Serializable, SliceAssigner, SliceSharedAssigner

封闭类:

SliceAssigners

public static final class SliceAssigners.SlicedSharedSliceAssigner
extends Object
implements SliceSharedAssigner

The SliceAssigner for elements have been attached slice end timestamp, and the slices are shared.

另请参阅:

序列化表格

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.table.runtime.operators.window.slicing.SliceSharedAssigner

SliceSharedAssigner.MergeCallback

构造器概要

构造器

构造器和说明
SlicedSharedSliceAssigner(int sliceEndIndex, SliceSharedAssigner innerAssigner)

方法概要

限定符和类型	方法和说明
long	getLastWindowEnd(long sliceEnd) Returns the last window which the slice belongs to.
void	mergeSlices(long sliceEnd, SliceSharedAssigner.MergeCallback callback) Determines which slices (if any) should be merged.
Optional<Long>	nextTriggerWindow(long windowEnd, java.util.function.Supplier<Boolean> isWindowEmpty) Returns the optional end timestamp of next window which should be triggered.

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.table.runtime.operators.window.slicing.SliceAssigner

assignSliceEnd, expiredSlices, getSliceEndInterval, getWindowStart, isEventTime

构造器详细资料

SlicedSharedSliceAssigner

public SlicedSharedSliceAssigner(int sliceEndIndex,
                                 SliceSharedAssigner innerAssigner)

方法详细资料

mergeSlices

public void mergeSlices(long sliceEnd,
                        SliceSharedAssigner.MergeCallback callback)
                 throws Exception

从接口复制的说明: SliceSharedAssigner

Determines which slices (if any) should be merged.

指定者:

mergeSlices 在接口中 SliceSharedAssigner

参数:

sliceEnd - the triggered slice, identified by end timestamp

callback - a callback that can be invoked to signal which slices should be merged.

抛出:

Exception

nextTriggerWindow

public Optional<Long> nextTriggerWindow(long windowEnd,
                                        java.util.function.Supplier<Boolean> isWindowEmpty)

从接口复制的说明: SliceSharedAssigner

Returns the optional end timestamp of next window which should be triggered. Empty if no following window to trigger for now.

The purpose of this method is avoid register too many timers for each hopping and cumulative slice, e.g. HOP(1day, 10s) needs register 8640 timers for every slice. In order to improve this, we only register one timer for the next window. For hopping windows we don't register next window if current window is empty (i.e. no records in current window). That means we will have one more unnecessary window triggered for hopping windows if no elements arrives for a key for a long time. We will skip to emit window result for the triggered empty window, see SliceSharedWindowAggProcessor.fireWindow(Long).

指定者:

nextTriggerWindow 在接口中 SliceSharedAssigner

参数:

windowEnd - the current triggered window, identified by end timestamp

isWindowEmpty - a supplier that can be invoked to get whether the triggered window is empty (i.e. no records in the window).

getLastWindowEnd

public long getLastWindowEnd(long sliceEnd)

从接口复制的说明: SliceAssigner

Returns the last window which the slice belongs to. The window and and slices are both identified by the end timestamp.

指定者:

getLastWindowEnd 在接口中 SliceAssigner