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

类 TumblingWindowAssigner

java.lang.Object

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

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

所有已实现的接口:

Serializable, InternalTimeWindowAssigner

public class TumblingWindowAssigner
extends GroupWindowAssigner<TimeWindow>
implements InternalTimeWindowAssigner

A GroupWindowAssigner that windows elements into fixed-size windows based on the timestamp of the elements. 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	TumblingWindowAssigner(long size, long offset, 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.
static TumblingWindowAssigner	of(Duration size) Creates a new TumblingWindowAssigner GroupWindowAssigner that assigns elements to time windows based on the element timestamp.
String	toString()
TumblingWindowAssigner	withEventTime()
TumblingWindowAssigner	withOffset(Duration offset) Creates a new TumblingWindowAssigner GroupWindowAssigner that assigns elements to time windows based on the element timestamp and offset.
TumblingWindowAssigner	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

TumblingWindowAssigner

protected TumblingWindowAssigner(long size,
                                 long offset,
                                 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.

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>

of

public static TumblingWindowAssigner of(Duration size)

Creates a new TumblingWindowAssigner GroupWindowAssigner that assigns elements to time windows based on the element timestamp.

参数:

size - The size of the generated windows.

返回:

The time policy.

withOffset

public TumblingWindowAssigner withOffset(Duration offset)

Creates a new TumblingWindowAssigner GroupWindowAssigner that assigns elements to time windows based on the element timestamp and offset.

For example, if you want window a stream by hour,but window begins at the 15th minutes of each hour, you can use of(Time.hours(1),Time.minutes(15)),then you will get time windows start at 0:15:00,1:15:00,2:15:00,etc.

Rather than that,if you are living in somewhere which is not using UTC±00:00 time, such as China which is using GMT+08:00,and you want a time window with size of one day, and window begins at every 00:00:00 of local time,you may use of(Time.days(1),Time.hours(-8)). The parameter of offset is Time.hours(-8)) since UTC+08:00 is 8 hours earlier than UTC time.

参数:

offset - The offset which window start would be shifted by.

返回:

The time policy.

withEventTime

public TumblingWindowAssigner withEventTime()

指定者:

withEventTime 在接口中 InternalTimeWindowAssigner

返回:

an InternalTimeWindowAssigner which in event time mode.

withProcessingTime

public TumblingWindowAssigner withProcessingTime()

指定者:

withProcessingTime 在接口中 InternalTimeWindowAssigner

返回:

an InternalTimeWindowAssigner which in processing time mode.