Package org.apache.flink.state.api.input.operator.window

Class EvictingWindowReaderFunction<IN,R,OUT,KEY,W extends org.apache.flink.streaming.api.windowing.windows.Window>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.state.api.functions.WindowReaderFunction<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>,OUT,KEY,W>

org.apache.flink.state.api.input.operator.window.EvictingWindowReaderFunction<IN,R,OUT,KEY,W>

Type Parameters:

IN - The input type stored in state.

R - The aggregated type.

OUT - The output type of the reader function.

KEY - The key type.

W - The window type.

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction

Direct Known Subclasses:

AggregateEvictingWindowReaderFunction, ProcessEvictingWindowReader, ReduceEvictingWindowReaderFunction

@Internal
public abstract class EvictingWindowReaderFunction<IN,R,OUT,KEY,W extends org.apache.flink.streaming.api.windowing.windows.Window>
extends WindowReaderFunction<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>,OUT,KEY,W>

Wrapper for reading state from an evicting window operator.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.state.api.functions.WindowReaderFunction

WindowReaderFunction.Context<W extends org.apache.flink.streaming.api.windowing.windows.Window>

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	EvictingWindowReaderFunction(WindowReaderFunction<R,OUT,KEY,W> wrappedFunction)

Method Summary

Modifier and Type	Method	Description
void	close()
void	open(org.apache.flink.api.common.functions.OpenContext openContext)
void	readWindow(KEY key, WindowReaderFunction.Context<W> context, Iterable<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>> elements, org.apache.flink.util.Collector<OUT> out)	Evaluates the window and outputs none or several elements.
void	setRuntimeContext(org.apache.flink.api.common.functions.RuntimeContext t)
abstract Iterable<R>	transform(Iterable<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>> elements)

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

getIterationRuntimeContext, getRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Details

EvictingWindowReaderFunction

protected EvictingWindowReaderFunction(WindowReaderFunction<R,OUT,KEY,W> wrappedFunction)

Method Details

open

public void open(org.apache.flink.api.common.functions.OpenContext openContext)
          throws Exception

Specified by:

open in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

open in class org.apache.flink.api.common.functions.AbstractRichFunction

Throws:

Exception

close

public void close()
           throws Exception

Specified by:

close in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

close in class org.apache.flink.api.common.functions.AbstractRichFunction

Throws:

Exception

setRuntimeContext

public void setRuntimeContext(org.apache.flink.api.common.functions.RuntimeContext t)

Specified by:

setRuntimeContext in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

setRuntimeContext in class org.apache.flink.api.common.functions.AbstractRichFunction

readWindow

public void readWindow(KEY key,
 WindowReaderFunction.Context<W> context,
 Iterable<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>> elements,
 org.apache.flink.util.Collector<OUT> out)
                throws Exception

Description copied from class: WindowReaderFunction

Evaluates the window and outputs none or several elements.

Specified by:

readWindow in class WindowReaderFunction<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>,OUT,KEY,W extends org.apache.flink.streaming.api.windowing.windows.Window>

Parameters:

key - The key for which this window is evaluated.

context - The context in which the window is being evaluated.

elements - The elements in the window being evaluated.

out - A collector for emitting elements.

Throws:

Exception - The function may throw exceptions to fail the program and trigger recovery.

transform

public abstract Iterable<R> transform(Iterable<org.apache.flink.streaming.runtime.streamrecord.StreamRecord<IN>> elements)
                               throws Exception

Throws:

Exception