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

类 TumblingProcessingTimeWindows

java.lang.Object

org.apache.flink.streaming.api.windowing.assigners.WindowAssigner<Object,TimeWindow>

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

所有已实现的接口:

Serializable

public class TumblingProcessingTimeWindows
extends WindowAssigner<Object,TimeWindow>

A WindowAssigner that windows elements into windows based on the current system time of the machine the operation is running on. Windows cannot overlap.

For example, in order to window into windows of 1 minute, every 10 seconds:

 DataStream<Tuple2<String, Integer>> in = ...;
 KeyedStream<String, Tuple2<String, Integer>> keyed = in.keyBy(...);
 WindowedStream<Tuple2<String, Integer>, String, TimeWindows> windowed =
   keyed.window(TumblingProcessingTimeWindows.of(Time.of(1, MINUTES), Time.of(10, SECONDS));
 

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.WindowAssigner

WindowAssigner.WindowAssignerContext

方法概要

限定符和类型	方法和说明
Collection<TimeWindow>	assignWindows(Object element, long timestamp, WindowAssigner.WindowAssignerContext context) Returns a Collection of windows that should be assigned to the element.
Trigger<Object,TimeWindow>	getDefaultTrigger(StreamExecutionEnvironment env) Returns the default trigger associated with this WindowAssigner.
long	getSize()
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 TumblingProcessingTimeWindows	of(Time size) Creates a new TumblingProcessingTimeWindows WindowAssigner that assigns elements to time windows based on the element timestamp.
static TumblingProcessingTimeWindows	of(Time size, Time offset) Creates a new TumblingProcessingTimeWindows WindowAssigner that assigns elements to time windows based on the element timestamp and offset.
String	toString()

从类继承的方法 java.lang.Object

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

方法详细资料

assignWindows

public Collection<TimeWindow> assignWindows(Object 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<Object,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.

getSize

public long getSize()

getDefaultTrigger

public Trigger<Object,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<Object,TimeWindow>

toString

public String toString()

覆盖:

toString 在类中 Object

of

public static TumblingProcessingTimeWindows of(Time size)

Creates a new TumblingProcessingTimeWindows WindowAssigner 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.

of

public static TumblingProcessingTimeWindows of(Time size,
                                               Time offset)

Creates a new TumblingProcessingTimeWindows WindowAssigner 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 UTC+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:

size - The size of the generated windows.

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

返回:

The time 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<Object,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<Object,TimeWindow>