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

Class SlidingPreReducer<T>

java.lang.Object

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

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

All Implemented Interfaces:

Serializable, Cloneable, PreAggregator

Direct Known Subclasses:

SlidingCountPreReducer, SlidingGroupedPreReducer, SlidingTimePreReducer

public abstract class SlidingPreReducer<T>
extends WindowBuffer<T>
implements PreAggregator

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected T	currentReduced
protected LinkedList<Integer>	elementsPerPreAggregate
protected int	elementsSinceLastPreAggregate
protected LinkedList<T>	reduced
protected org.apache.flink.api.common.functions.ReduceFunction<T>	reducer
protected org.apache.flink.api.common.typeutils.TypeSerializer<T>	serializer
protected int	toRemove

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

emitEmpty, emitPerGroup, nextID, sequentialID

Constructor Summary

Constructors

Constructor and Description
SlidingPreReducer(org.apache.flink.api.common.functions.ReduceFunction<T> reducer, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)

Method Summary

Modifier and Type	Method and Description
protected void	addCurrentToBuffer(T element)
boolean	addFinalAggregate(StreamWindow<T> currentWindow)
protected void	addToBufferIfEligible(T element)
protected void	afterEmit()
protected void	afterStore()
abstract SlidingPreReducer<T>	clone()
protected abstract boolean	currentEligible(T next)
protected boolean	currentNotEmpty()
void	emitWindow(org.apache.flink.util.Collector<StreamWindow<T>> collector)
void	evict(int n)
static int	max(int a, int b)
protected void	removeLastReduced()
protected void	resetCurrent()
void	store(T element)
String	toString()
protected void	updateCurrent(T element)

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

reducer

protected org.apache.flink.api.common.functions.ReduceFunction<T> reducer

currentReduced

protected T currentReduced

reduced

protected LinkedList<T> reduced

elementsPerPreAggregate

protected LinkedList<Integer> elementsPerPreAggregate

serializer

protected org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer

toRemove

protected int toRemove

elementsSinceLastPreAggregate

protected int elementsSinceLastPreAggregate

Constructor Detail

SlidingPreReducer

public SlidingPreReducer(org.apache.flink.api.common.functions.ReduceFunction<T> reducer,
                         org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)

Method Detail

emitWindow

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

Specified by:

emitWindow in class WindowBuffer<T>

afterEmit

protected void afterEmit()

addFinalAggregate

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

Throws:

Exception

store

public void store(T element)
           throws Exception

Specified by:

store in class WindowBuffer<T>

Throws:

Exception

afterStore

protected void afterStore()

addToBufferIfEligible

protected void addToBufferIfEligible(T element)
                              throws Exception

Throws:

Exception

resetCurrent

protected void resetCurrent()

currentNotEmpty

protected boolean currentNotEmpty()

updateCurrent

protected void updateCurrent(T element)
                      throws Exception

Throws:

Exception

addCurrentToBuffer

protected void addCurrentToBuffer(T element)
                           throws Exception

Throws:

Exception

currentEligible

protected abstract boolean currentEligible(T next)

evict

public void evict(int n)

Specified by:

evict in class WindowBuffer<T>

removeLastReduced

protected void removeLastReduced()

max

public static int max(int a,
                      int b)

clone

public abstract SlidingPreReducer<T> clone()

Specified by:

clone in class WindowBuffer<T>

toString

public String toString()

Overrides:

toString in class Object