org.apache.flink.streaming.api.operators

Class StreamProject<IN,OUT extends org.apache.flink.api.java.tuple.Tuple>

java.lang.Object

org.apache.flink.streaming.api.operators.AbstractStreamOperator<OUT>

org.apache.flink.streaming.api.operators.StreamProject<IN,OUT>

All Implemented Interfaces:

Serializable, OneInputStreamOperator<IN,OUT>, StreamOperator<OUT>

public class StreamProject<IN,OUT extends org.apache.flink.api.java.tuple.Tuple>
extends AbstractStreamOperator<OUT>
implements OneInputStreamOperator<IN,OUT>

See Also:

Serialized Form

Field Summary

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

chainingStrategy, LOG, output

Constructor Summary

Constructors

Constructor and Description
StreamProject(int[] fields, TypeSerializer<OUT> outSerializer)

Method Summary

Methods

Modifier and Type	Method and Description
void	open() This method is called immediately before any elements are processed, it should contain the operator's initialization logic.
void	processElement(StreamRecord<IN> element) Processes one element that arrived at this operator.
void	processWatermark(Watermark mark) Processes a Watermark.

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

close, createKeyValueState, createKeyValueState, disableInputCopy, dispose, getChainingStrategy, getContainingTask, getExecutionConfig, getOperatorConfig, getRuntimeContext, getStateBackend, getUserCodeClassloader, isInputCopyingDisabled, notifyOfCompletedCheckpoint, registerTimer, restoreState, setChainingStrategy, setKeyContext, setKeyContextElement, setup, snapshotOperatorState

Methods inherited from class java.lang.Object

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

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

close, dispose, getChainingStrategy, isInputCopyingDisabled, notifyOfCompletedCheckpoint, restoreState, setChainingStrategy, setKeyContextElement, setup, snapshotOperatorState

Constructor Detail

StreamProject

public StreamProject(int[] fields,
             TypeSerializer<OUT> outSerializer)

Method Detail

processElement

public void processElement(StreamRecord<IN> element)
                    throws Exception

Description copied from interface: OneInputStreamOperator

Processes one element that arrived at this operator. This method is guaranteed to not be called concurrently with other methods of the operator.

Specified by:

processElement in interface OneInputStreamOperator<IN,OUT extends org.apache.flink.api.java.tuple.Tuple>

Throws:

Exception

open

public void open()
          throws Exception

Description copied from class: AbstractStreamOperator

This method is called immediately before any elements are processed, it should contain the operator's initialization logic.

The default implementation does nothing.

Specified by:

open in interface StreamOperator<OUT extends org.apache.flink.api.java.tuple.Tuple>

Overrides:

open in class AbstractStreamOperator<OUT extends org.apache.flink.api.java.tuple.Tuple>

Throws:

Exception - An exception in this method causes the operator to fail.

processWatermark

public void processWatermark(Watermark mark)
                      throws Exception

Description copied from interface: OneInputStreamOperator

Processes a Watermark. This method is guaranteed to not be called concurrently with other methods of the operator.

Specified by:

processWatermark in interface OneInputStreamOperator<IN,OUT extends org.apache.flink.api.java.tuple.Tuple>

Throws:

Exception

See Also:

Watermark