org.apache.flink.streaming.api.windowing.windowbuffer

Class WindowBuffer<T>

java.lang.Object

org.apache.flink.streaming.api.windowing.windowbuffer.WindowBuffer<T>

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

BasicWindowBuffer, SlidingPreReducer, TumblingGroupedPreReducer, TumblingPreReducer

public abstract class WindowBuffer<T>
extends Object
implements Serializable, Cloneable

Class for defining specialized buffers to store/emit window data. Pre-aggregators should be implemented using this interface.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	emitEmpty
protected boolean	emitPerGroup
protected Integer	nextID
protected boolean	sequentialID

Constructor Summary

Constructors

Constructor and Description
WindowBuffer()

Method Summary

Modifier and Type	Method and Description
abstract WindowBuffer<T>	clone()
protected StreamWindow<T>	createEmptyWindow()
WindowBuffer<T>	emitEmpty()
abstract void	emitWindow(org.apache.flink.util.Collector<StreamWindow<T>> collector)
abstract void	evict(int n)
WindowBuffer<T>	sequentialID()
abstract void	store(T element)

Methods inherited from class java.lang.Object

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

Field Detail

nextID

protected Integer nextID

sequentialID

protected boolean sequentialID

emitEmpty

protected boolean emitEmpty

emitPerGroup

protected boolean emitPerGroup

Constructor Detail

WindowBuffer

public WindowBuffer()

Method Detail

store

public abstract void store(T element)
                    throws Exception

Throws:

Exception

evict

public abstract void evict(int n)

emitWindow

public abstract void emitWindow(org.apache.flink.util.Collector<StreamWindow<T>> collector)

clone

public abstract WindowBuffer<T> clone()

Overrides:

clone in class Object

emitEmpty

public WindowBuffer<T> emitEmpty()

sequentialID

public WindowBuffer<T> sequentialID()

createEmptyWindow

protected StreamWindow<T> createEmptyWindow()