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

Class SlidingGroupedPreReducer<T>

java.lang.Object

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

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

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

All Implemented Interfaces:

Serializable, Cloneable, PreAggregator

Direct Known Subclasses:

SlidingCountGroupedPreReducer, SlidingTimeGroupedPreReducer

public abstract class SlidingGroupedPreReducer<T>
extends SlidingPreReducer<T>

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<Object,T>	currentReducedMap
protected org.apache.flink.api.java.functions.KeySelector<T,?>	key
protected LinkedList<Map<Object,T>>	reducedMap

Fields inherited from class org.apache.flink.streaming.api.windowing.windowbuffer.SlidingPreReducer

currentReduced, elementsPerPreAggregate, elementsSinceLastPreAggregate, reduced, reducer, serializer, toRemove

Fields inherited from class org.apache.flink.streaming.api.windowing.windowbuffer.WindowBuffer

emitEmpty, emitPerGroup, nextID, sequentialID

Constructor Summary

Constructors

Constructor and Description
SlidingGroupedPreReducer(org.apache.flink.api.common.functions.ReduceFunction<T> reducer, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer, org.apache.flink.api.java.functions.KeySelector<T,?> key)

Method Summary

Modifier and Type	Method and Description
protected void	addCurrentToBuffer(T element)
boolean	addFinalAggregate(StreamWindow<T> currentWindow)
protected boolean	currentNotEmpty()
protected void	removeLastReduced()
protected void	resetCurrent()
protected void	updateCurrent(T element)

Methods inherited from class org.apache.flink.streaming.api.windowing.windowbuffer.SlidingPreReducer

addToBufferIfEligible, afterEmit, afterStore, clone, currentEligible, emitWindow, evict, max, store, toString

Methods inherited from class org.apache.flink.streaming.api.windowing.windowbuffer.WindowBuffer

createEmptyWindow, emitEmpty, sequentialID

Methods inherited from class java.lang.Object

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

Field Detail

currentReducedMap

protected Map<Object,T> currentReducedMap

reducedMap

protected LinkedList<Map<Object,T>> reducedMap

key

protected org.apache.flink.api.java.functions.KeySelector<T,?> key

Constructor Detail

SlidingGroupedPreReducer

public SlidingGroupedPreReducer(org.apache.flink.api.common.functions.ReduceFunction<T> reducer,
                                org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer,
                                org.apache.flink.api.java.functions.KeySelector<T,?> key)

Method Detail

addFinalAggregate

public boolean addFinalAggregate(StreamWindow<T> currentWindow)
                          throws Exception

Overrides:

addFinalAggregate in class SlidingPreReducer<T>

Throws:

Exception

updateCurrent

protected void updateCurrent(T element)
                      throws Exception

Overrides:

updateCurrent in class SlidingPreReducer<T>

Throws:

Exception

removeLastReduced

protected void removeLastReduced()

Overrides:

removeLastReduced in class SlidingPreReducer<T>

addCurrentToBuffer

protected void addCurrentToBuffer(T element)
                           throws Exception

Overrides:

addCurrentToBuffer in class SlidingPreReducer<T>

Throws:

Exception

resetCurrent

protected void resetCurrent()

Overrides:

resetCurrent in class SlidingPreReducer<T>

currentNotEmpty

protected boolean currentNotEmpty()

Overrides:

currentNotEmpty in class SlidingPreReducer<T>