org.apache.flink.table.runtime.operators.window.groupwindow.assigners

类 SessionWindowAssigner

java.lang.Object

org.apache.flink.table.runtime.operators.window.groupwindow.assigners.GroupWindowAssigner<W>

org.apache.flink.table.runtime.operators.window.groupwindow.assigners.MergingWindowAssigner<TimeWindow>

org.apache.flink.table.runtime.operators.window.groupwindow.assigners.SessionWindowAssigner

所有已实现的接口:

Serializable, InternalTimeWindowAssigner

public class SessionWindowAssigner
extends MergingWindowAssigner<TimeWindow>
implements InternalTimeWindowAssigner

A GroupWindowAssigner that windows elements into sessions based on the timestamp. Windows cannot overlap.

另请参阅:

序列化表格

构造器概要

构造器

限定符	构造器和说明
protected	SessionWindowAssigner(long sessionGap, boolean isEventTime)

方法概要

限定符和类型	方法和说明
Collection<TimeWindow>	assignWindows(org.apache.flink.table.data.RowData element, long timestamp) Given the timestamp and element, returns the set of windows into which it should be placed.
org.apache.flink.api.common.typeutils.TypeSerializer<TimeWindow>	getWindowSerializer(org.apache.flink.api.common.ExecutionConfig executionConfig) Returns a TypeSerializer for serializing windows that are assigned by this WindowAssigner.
boolean	isEventTime() Returns true if elements are assigned to windows based on event time, false otherwise.
void	mergeWindows(TimeWindow newWindow, NavigableSet<TimeWindow> sortedWindows, MergeCallback<TimeWindow,Collection<TimeWindow>> callback) Determines which windows (if any) should be merged.
String	toString()
SessionWindowAssigner	withEventTime()
static SessionWindowAssigner	withGap(Duration size) Creates a new SessionWindowAssigner GroupWindowAssigner that assigns elements to sessions based on the timestamp.
SessionWindowAssigner	withProcessingTime()

从类继承的方法 org.apache.flink.table.runtime.operators.window.groupwindow.assigners.GroupWindowAssigner

open

从类继承的方法 java.lang.Object

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

构造器详细资料

SessionWindowAssigner

protected SessionWindowAssigner(long sessionGap,
                                boolean isEventTime)

方法详细资料

assignWindows

public Collection<TimeWindow> assignWindows(org.apache.flink.table.data.RowData element,
                                            long timestamp)

从类复制的说明: GroupWindowAssigner

Given the timestamp and element, returns the set of windows into which it should be placed.

指定者:

assignWindows 在类中 GroupWindowAssigner<TimeWindow>

参数:

element - The element to which windows should be assigned.

timestamp - The timestamp of the element when GroupWindowAssigner.isEventTime() returns true, or the current system time when GroupWindowAssigner.isEventTime() returns false. The timestamp value is mapping to UTC milliseconds for splitting windows simply.

mergeWindows

public void mergeWindows(TimeWindow newWindow,
                         NavigableSet<TimeWindow> sortedWindows,
                         MergeCallback<TimeWindow,Collection<TimeWindow>> callback)

从类复制的说明: MergingWindowAssigner

Determines which windows (if any) should be merged.

指定者:

mergeWindows 在类中 MergingWindowAssigner<TimeWindow>

参数:

newWindow - The new window

sortedWindows - The sorted window candidates.

callback - A callback that can be invoked to signal which windows should be merged.

getWindowSerializer

public org.apache.flink.api.common.typeutils.TypeSerializer<TimeWindow> getWindowSerializer(org.apache.flink.api.common.ExecutionConfig executionConfig)

从类复制的说明: GroupWindowAssigner

Returns a TypeSerializer for serializing windows that are assigned by this WindowAssigner.

指定者:

getWindowSerializer 在类中 GroupWindowAssigner<TimeWindow>

isEventTime

public boolean isEventTime()

从类复制的说明: GroupWindowAssigner

Returns true if elements are assigned to windows based on event time, false otherwise.

指定者:

isEventTime 在类中 GroupWindowAssigner<TimeWindow>

toString

public String toString()

指定者:

toString 在类中 GroupWindowAssigner<TimeWindow>

withGap

public static SessionWindowAssigner withGap(Duration size)

Creates a new SessionWindowAssigner GroupWindowAssigner that assigns elements to sessions based on the timestamp.

参数:

size - The session timeout, i.e. the time gap between sessions

返回:

The policy.

withEventTime

public SessionWindowAssigner withEventTime()

指定者:

withEventTime 在接口中 InternalTimeWindowAssigner

返回:

an InternalTimeWindowAssigner which in event time mode.

withProcessingTime

public SessionWindowAssigner withProcessingTime()

指定者:

withProcessingTime 在接口中 InternalTimeWindowAssigner

返回:

an InternalTimeWindowAssigner which in processing time mode.