Package org.apache.flink.table.runtime.operators.window.groupwindow.internal

Class MergingWindowProcessFunction<K,W extends Window>

java.lang.Object

org.apache.flink.table.runtime.operators.window.groupwindow.internal.InternalWindowProcessFunction<K,W>

org.apache.flink.table.runtime.operators.window.groupwindow.internal.MergingWindowProcessFunction<K,W>

Type Parameters:

W - The type of Window that assigner assigns.

All Implemented Interfaces:

Serializable

public class MergingWindowProcessFunction<K,W extends Window>
extends InternalWindowProcessFunction<K,W>

The implementation of InternalWindowProcessFunction for MergingWindowAssigner.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MergingWindowProcessFunction.DefaultAccMergingConsumer<W extends Window>	A default merging consumer that merges the accumulators in state windows that waiting to be merged into the target state window.
static interface	MergingWindowProcessFunction.MergingContext<K,W extends Window>	A InternalWindowProcessFunction.Context used for MergingWindowProcessFunction.

Nested classes/interfaces inherited from class org.apache.flink.table.runtime.operators.window.groupwindow.internal.InternalWindowProcessFunction

InternalWindowProcessFunction.Context<K,W extends Window>

Field Summary

Fields inherited from class org.apache.flink.table.runtime.operators.window.groupwindow.internal.InternalWindowProcessFunction

allowedLateness, ctx, windowAggregator

Constructor Summary

Constructors

Constructor	Description
MergingWindowProcessFunction(MergingWindowAssigner<W> windowAssigner, NamespaceAggsHandleFunctionBase<W> windowAggregator, org.apache.flink.api.common.typeutils.TypeSerializer<W> windowSerializer, long allowedLateness)

Method Summary

Modifier and Type	Method	Description
Collection<W>	assignActualWindows(org.apache.flink.table.data.RowData inputRow, long timestamp)	Assigns the input element into the actual windows which the Trigger should trigger on.
Collection<W>	assignStateNamespace(org.apache.flink.table.data.RowData inputRow, long timestamp)	Assigns the input element into the state namespace which the input element should be accumulated/retracted into.
void	cleanWindowIfNeeded(W window, long currentTime)	Cleans the given window if needed.
W	getStateWindow(W window)	Get the state window as the namespace stored acc in the data about this actual window.
void	open(InternalWindowProcessFunction.Context<K,W> ctx)	Initialization method for the function.
void	prepareAggregateAccumulatorForEmit(W window)	Prepares the accumulator of the given window before emit the final result.

Methods inherited from class org.apache.flink.table.runtime.operators.window.groupwindow.internal.InternalWindowProcessFunction

close, isCleanupTime, isWindowLate

Methods inherited from class java.lang.Object

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

Constructor Details

MergingWindowProcessFunction

public MergingWindowProcessFunction(MergingWindowAssigner<W> windowAssigner,
 NamespaceAggsHandleFunctionBase<W> windowAggregator,
 org.apache.flink.api.common.typeutils.TypeSerializer<W> windowSerializer,
 long allowedLateness)

Method Details

open

public void open(InternalWindowProcessFunction.Context<K,W> ctx)
          throws Exception

Description copied from class: InternalWindowProcessFunction

Initialization method for the function. It is called before the actual working methods.

Overrides:

open in class InternalWindowProcessFunction<K,W extends Window>

Throws:

Exception

assignStateNamespace

public Collection<W> assignStateNamespace(org.apache.flink.table.data.RowData inputRow,
 long timestamp)
                                   throws Exception

Description copied from class: InternalWindowProcessFunction

Assigns the input element into the state namespace which the input element should be accumulated/retracted into.

Specified by:

assignStateNamespace in class InternalWindowProcessFunction<K,W extends Window>

Parameters:

inputRow - the input element

timestamp - the timestamp of the element or the processing time (depends on the type of assigner)

Returns:

the state namespace

Throws:

Exception

assignActualWindows

public Collection<W> assignActualWindows(org.apache.flink.table.data.RowData inputRow,
 long timestamp)
                                  throws Exception

Description copied from class: InternalWindowProcessFunction

Assigns the input element into the actual windows which the Trigger should trigger on.

Specified by:

assignActualWindows in class InternalWindowProcessFunction<K,W extends Window>

Parameters:

inputRow - the input element

timestamp - the timestamp of the element or the processing time (depends on the type of assigner)

Returns:

the actual windows

Throws:

Exception

prepareAggregateAccumulatorForEmit

public void prepareAggregateAccumulatorForEmit(W window)
                                        throws Exception

Description copied from class: InternalWindowProcessFunction

Prepares the accumulator of the given window before emit the final result. The accumulator is stored in the state or will be created if there is no corresponding accumulator in state.

Specified by:

prepareAggregateAccumulatorForEmit in class InternalWindowProcessFunction<K,W extends Window>

Parameters:

window - the window

Throws:

Exception

cleanWindowIfNeeded

public void cleanWindowIfNeeded(W window,
 long currentTime)
                         throws Exception

Description copied from class: InternalWindowProcessFunction

Cleans the given window if needed.

Specified by:

cleanWindowIfNeeded in class InternalWindowProcessFunction<K,W extends Window>

Parameters:

window - the window to cleanup

currentTime - the current timestamp

Throws:

Exception

getStateWindow

public W getStateWindow(W window)
                 throws Exception

Get the state window as the namespace stored acc in the data about this actual window.

Throws:

Exception