org.apache.flink.streaming.runtime.operators.windowing.buffers

Class ReducingWindowBuffer<T>

java.lang.Object

org.apache.flink.streaming.runtime.operators.windowing.buffers.ReducingWindowBuffer<T>

Type Parameters:

T - The type of elements that this WindowBuffer can store.

All Implemented Interfaces:

WindowBuffer<T,T>

@Internal
public class ReducingWindowBuffer<T>
extends Object
implements WindowBuffer<T,T>

An WindowBuffer that stores elements on the Java Heap. This buffer uses a ReduceFunction to incrementally aggregate elements that are added to the buffer.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ReducingWindowBuffer.Factory<T>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ReducingWindowBuffer(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction, StreamRecord<T> data, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)
protected	ReducingWindowBuffer(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)

Method Summary

Modifier and Type	Method and Description
Iterable<StreamRecord<T>>	getElements() Returns all elements that are currently in the buffer.
Iterable<T>	getUnpackedElements() Returns all elements that are currently in the buffer.
int	size() Returns the number of elements that are currently in the buffer.
void	snapshot(org.apache.flink.core.memory.DataOutputView out) Writes the contents of the window buffer to a DataOutputView for checkpointing.
void	storeElement(StreamRecord<T> element) Adds the element to the buffer.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReducingWindowBuffer

protected ReducingWindowBuffer(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction,
                               org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)

ReducingWindowBuffer

protected ReducingWindowBuffer(org.apache.flink.api.common.functions.ReduceFunction<T> reduceFunction,
                               StreamRecord<T> data,
                               org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer)

Method Detail

storeElement

public void storeElement(StreamRecord<T> element)
                  throws Exception

Description copied from interface: WindowBuffer

Adds the element to the buffer.

Specified by:

storeElement in interface WindowBuffer<T,T>

Parameters:

element - The element to add.

Throws:

Exception

getElements

public Iterable<StreamRecord<T>> getElements()

Description copied from interface: WindowBuffer

Returns all elements that are currently in the buffer.

Specified by:

getElements in interface WindowBuffer<T,T>

getUnpackedElements

public Iterable<T> getUnpackedElements()

Description copied from interface: WindowBuffer

Returns all elements that are currently in the buffer. This will unwrap the contained elements from their StreamRecord.

Specified by:

getUnpackedElements in interface WindowBuffer<T,T>

size

public int size()

Description copied from interface: WindowBuffer

Returns the number of elements that are currently in the buffer.

Specified by:

size in interface WindowBuffer<T,T>

snapshot

public void snapshot(org.apache.flink.core.memory.DataOutputView out)
              throws IOException

Description copied from interface: WindowBuffer

Writes the contents of the window buffer to a DataOutputView for checkpointing.

Specified by:

snapshot in interface WindowBuffer<T,T>

Throws:

IOException