org.apache.flink.api.java.operators

Class Operator<OUT,O extends Operator<OUT,O>>

java.lang.Object

org.apache.flink.api.java.DataSet<OUT>

org.apache.flink.api.java.operators.Operator<OUT,O>

Type Parameters:

OUT - The type of the data set produced by this operator.

O - The type of the operator, so that we can return it.

Direct Known Subclasses:

SingleInputOperator, TwoInputOperator

public abstract class Operator<OUT,O extends Operator<OUT,O>>
extends DataSet<OUT>

Base class of all operators in the Java API.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Operator(ExecutionEnvironment context, TypeInformation<OUT> resultType)

Method Summary

Methods

Modifier and Type	Method and Description
String	getName() Returns the name of the operator.
int	getParallelism() Returns the degree of parallelism of this operator.
TypeInformation<OUT>	getResultType() Returns the type of the result of this operator.
O	name(String newName) Sets the name of this operator.
O	setParallelism(int dop) Sets the degree of parallelism for this operator.

Methods inherited from class org.apache.flink.api.java.DataSet

aggregate, checkSameExecutionContext, coGroup, cross, crossWithHuge, crossWithTiny, distinct, distinct, distinct, filter, flatMap, getExecutionEnvironment, getType, groupBy, groupBy, iterate, iterateDelta, join, joinWithHuge, joinWithTiny, map, max, min, output, print, printToErr, project, reduce, reduceGroup, runOperation, sum, union, write, write, writeAsCsv, writeAsCsv, writeAsCsv, writeAsText, writeAsText

Methods inherited from class java.lang.Object

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

Constructor Detail

Operator

protected Operator(ExecutionEnvironment context,
        TypeInformation<OUT> resultType)

Method Detail

getResultType

public TypeInformation<OUT> getResultType()

Returns the type of the result of this operator.

Returns:

The result type of the operator.

getName

public String getName()

Returns the name of the operator. If no name has been set, it returns the name of the operation, or the name of the class implementing the function of this operator.

Returns:

The name of the operator.

getParallelism

public int getParallelism()

Returns the degree of parallelism of this operator.

Returns:

The degree of parallelism of this operator.

name

public O name(String newName)

Sets the name of this operator. This overrides the default name, which is either a generated description of the operation (such as for example "Aggregate(1:SUM, 2:MIN)") or the name the user-defined function or input/output format executed by the operator.

Parameters:

newName - The name for this operator.

Returns:

The operator with a new name.

setParallelism

public O setParallelism(int dop)

Sets the degree of parallelism for this operator. The degree must be 1 or more.

Parameters:

dop - The degree of parallelism for this operator.

Returns:

The operator with set degree of parallelism.