org.apache.flink.streaming.api.windowing.assigners

类 DynamicProcessingTimeSessionWindows<T>

java.lang.Object

org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<T,W>

org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner<T,TimeWindow>

org.apache.flink.streaming.api.windowing.assigners.DynamicProcessingTimeSessionWindows<T>

类型参数:

T - The type of the input elements

所有已实现的接口:

Serializable

@PublicEvolving
public class DynamicProcessingTimeSessionWindows<T>
extends MergingWindowAssigner<T,TimeWindow>

A WindowAssigner that windows elements into sessions based on the current processing time. Windows cannot overlap.

For example, in order to window into windows with a dynamic time gap:

 DataStream<Tuple2<String, Integer>> in = ...;
 KeyedStream<String, Tuple2<String, Integer>> keyed = in.keyBy(...);
 WindowedStream<Tuple2<String, Integer>, String, TimeWindows> windowed =
   keyed.window(DynamicProcessingTimeSessionWindows.withDynamicGap({@link SessionWindowTimeGapExtractor }));
 

另请参阅:

序列化表格

嵌套类概要

从类继承的嵌套类/接口 org.apache.flink.streaming.api.windowing.assigners.MergingWindowAssigner

MergingWindowAssigner.MergeCallback<W>

从类继承的嵌套类/接口 org.apache.flink.streaming.api.windowing.assigners.WindowAssigner

WindowAssigner.WindowAssignerContext

字段概要

字段

限定符和类型	字段和说明
protected SessionWindowTimeGapExtractor<T>	sessionWindowTimeGapExtractor

构造器概要

构造器

限定符	构造器和说明
protected	DynamicProcessingTimeSessionWindows(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)

方法概要

限定符和类型	方法和说明
Collection<TimeWindow>	assignWindows(T element, long timestamp, WindowAssigner.WindowAssignerContext context) Returns a Collection of windows that should be assigned to the element.
Trigger<T,TimeWindow>	getDefaultTrigger(StreamExecutionEnvironment env) Returns the default trigger associated with this WindowAssigner.
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(Collection<TimeWindow> windows, MergingWindowAssigner.MergeCallback<TimeWindow> c) Merge overlapping TimeWindows.
String	toString()
static <T> DynamicProcessingTimeSessionWindows<T>	withDynamicGap(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor) Creates a new SessionWindows WindowAssigner that assigns elements to sessions based on the element timestamp.

从类继承的方法 java.lang.Object

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

字段详细资料

sessionWindowTimeGapExtractor

protected SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor

构造器详细资料

DynamicProcessingTimeSessionWindows

protected DynamicProcessingTimeSessionWindows(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)

方法详细资料

assignWindows

public Collection<TimeWindow> assignWindows(T element,
                                            long timestamp,
                                            WindowAssigner.WindowAssignerContext context)

从类复制的说明: WindowAssigner

Returns a Collection of windows that should be assigned to the element.

指定者:

assignWindows 在类中 WindowAssigner<T,TimeWindow>

参数:

element - The element to which windows should be assigned.

timestamp - The timestamp of the element.

context - The WindowAssigner.WindowAssignerContext in which the assigner operates.

getDefaultTrigger

public Trigger<T,TimeWindow> getDefaultTrigger(StreamExecutionEnvironment env)

从类复制的说明: WindowAssigner

Returns the default trigger associated with this WindowAssigner.

指定者:

getDefaultTrigger 在类中 WindowAssigner<T,TimeWindow>

toString

public String toString()

覆盖:

toString 在类中 Object

withDynamicGap

public static <T> DynamicProcessingTimeSessionWindows<T> withDynamicGap(SessionWindowTimeGapExtractor<T> sessionWindowTimeGapExtractor)

Creates a new SessionWindows WindowAssigner that assigns elements to sessions based on the element timestamp.

参数:

sessionWindowTimeGapExtractor - The extractor to use to extract the time gap from the input elements

返回:

The policy.

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: WindowAssigner

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

指定者:

getWindowSerializer 在类中 WindowAssigner<T,TimeWindow>

isEventTime

public boolean isEventTime()

从类复制的说明: WindowAssigner

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

指定者:

isEventTime 在类中 WindowAssigner<T,TimeWindow>

mergeWindows

public void mergeWindows(Collection<TimeWindow> windows,
                         MergingWindowAssigner.MergeCallback<TimeWindow> c)

Merge overlapping TimeWindows.

指定者:

mergeWindows 在类中 MergingWindowAssigner<T,TimeWindow>

参数:

windows - The window candidates.

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