org.apache.flink.streaming.api.operators.windowing

Class StreamDiscretizer<IN>

java.lang.Object

org.apache.flink.streaming.api.operators.AbstractStreamOperator<WindowEvent<IN>>

org.apache.flink.streaming.api.operators.windowing.StreamDiscretizer<IN>

All Implemented Interfaces:

Serializable, OneInputStreamOperator<IN,WindowEvent<IN>>, StreamOperator<WindowEvent<IN>>

Direct Known Subclasses:

GroupedStreamDiscretizer

public class StreamDiscretizer<IN>
extends AbstractStreamOperator<WindowEvent<IN>>
implements OneInputStreamOperator<IN,WindowEvent<IN>>

This operator represents the discretization step of a window transformation. The user supplied eviction and trigger policies are applied to create the StreamWindow that will be further transformed in the next stages.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.streaming.api.operators.StreamOperator

StreamOperator.ChainingStrategy

Field Summary

Fields

Modifier and Type	Field and Description
protected EvictionPolicy<IN>	evictionPolicy
protected TriggerPolicy<IN>	triggerPolicy
protected WindowEvent<IN>	windowEvent

Fields inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

chainingStrategy, executionConfig, inputCopyDisabled, output, runtimeContext

Constructor Summary

Constructors

Constructor and Description
StreamDiscretizer(TriggerPolicy<IN> triggerPolicy, EvictionPolicy<IN> evictionPolicy)

Method Summary

Modifier and Type	Method and Description
void	close() This method is called after no more elements for can arrive for processing.
protected void	emitWindow() This method emits the content of the buffer as a new StreamWindow if not empty
boolean	equals(Object other)
EvictionPolicy<IN>	getEviction()
TriggerPolicy<IN>	getTrigger()
void	open(org.apache.flink.configuration.Configuration parameters) This method is called before any elements are processed.
void	processElement(IN element)
protected void	processRealElement(IN input) This method processed an arrived real element The method is synchronized to ensure that it cannot interleave with triggerOnFakeElement(Object)
String	toString()
protected void	triggerOnFakeElement(Object input) This method triggers on an arrived fake element The method is synchronized to ensure that it cannot interleave with processRealElement(Object)

Methods inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

disableInputCopy, getChainingStrategy, isInputCopyingDisabled, setChainingStrategy, setup

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.streaming.api.operators.StreamOperator

getChainingStrategy, isInputCopyingDisabled, setChainingStrategy, setup

Field Detail

triggerPolicy

protected TriggerPolicy<IN> triggerPolicy

evictionPolicy

protected EvictionPolicy<IN> evictionPolicy

windowEvent

protected WindowEvent<IN> windowEvent

Constructor Detail

StreamDiscretizer

public StreamDiscretizer(TriggerPolicy<IN> triggerPolicy,
                         EvictionPolicy<IN> evictionPolicy)

Method Detail

getTrigger

public TriggerPolicy<IN> getTrigger()

getEviction

public EvictionPolicy<IN> getEviction()

processElement

public void processElement(IN element)
                    throws Exception

Specified by:

processElement in interface OneInputStreamOperator<IN,WindowEvent<IN>>

Throws:

Exception

processRealElement

protected void processRealElement(IN input)
                           throws Exception

This method processed an arrived real element The method is synchronized to ensure that it cannot interleave with triggerOnFakeElement(Object)

Parameters:

input - a real input element

Throws:

Exception

triggerOnFakeElement

protected void triggerOnFakeElement(Object input)

This method triggers on an arrived fake element The method is synchronized to ensure that it cannot interleave with processRealElement(Object)

Parameters:

input - a fake input element

emitWindow

protected void emitWindow()

This method emits the content of the buffer as a new StreamWindow if not empty

open

public void open(org.apache.flink.configuration.Configuration parameters)
          throws Exception

Description copied from interface: StreamOperator

This method is called before any elements are processed.

Specified by:

open in interface StreamOperator<WindowEvent<IN>>

Overrides:

open in class AbstractStreamOperator<WindowEvent<IN>>

Throws:

Exception

close

public void close()
           throws Exception

Description copied from interface: StreamOperator

This method is called after no more elements for can arrive for processing.

Specified by:

close in interface StreamOperator<WindowEvent<IN>>

Overrides:

close in class AbstractStreamOperator<WindowEvent<IN>>

Throws:

Exception

equals

public boolean equals(Object other)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object