org.apache.flink.streaming.api.operators

Enum ChainingStrategy

java.lang.Object

java.lang.Enum<ChainingStrategy>

org.apache.flink.streaming.api.operators.ChainingStrategy

All Implemented Interfaces:

Serializable, Comparable<ChainingStrategy>

public enum ChainingStrategy
extends Enum<ChainingStrategy>

Defines the chaining scheme for the operator. By default ALWAYS is used, which means operators will be eagerly chained whenever possible.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALWAYS Operators will be eagerly chained whenever possible, for maximal performance.
FORCE_ALWAYS Chaining will happen even if chaining is disabled on the execution environment.
HEAD
NEVER The operator will not be chained to the preceding or succeeding operators.

Method Summary

Methods

Modifier and Type	Method and Description
static ChainingStrategy	valueOf(String name) Returns the enum constant of this type with the specified name.
static ChainingStrategy[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

FORCE_ALWAYS

public static final ChainingStrategy FORCE_ALWAYS

Chaining will happen even if chaining is disabled on the execution environment. This should only be used by system-level operators, not operators implemented by users.

ALWAYS

public static final ChainingStrategy ALWAYS

Operators will be eagerly chained whenever possible, for maximal performance. It is generally a good practice to allow maximal chaining and increase operator parallelism

NEVER

public static final ChainingStrategy NEVER

The operator will not be chained to the preceding or succeeding operators.

HEAD

public static final ChainingStrategy HEAD

Method Detail

values

public static ChainingStrategy[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ChainingStrategy c : ChainingStrategy.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ChainingStrategy valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null