Package org.apache.flink.streaming.runtime.operators.asyncprocessing

Enum ElementOrder

java.lang.Object

java.lang.Enum<ElementOrder>

org.apache.flink.streaming.runtime.operators.asyncprocessing.ElementOrder

All Implemented Interfaces:

Serializable, Comparable<ElementOrder>

@Internal
public enum ElementOrder
extends Enum<ElementOrder>

This enum defines the element order of being processed. Only the elements with the same key should be considered here. We should keep this internal and away from API module for now, until we could see the concrete need for FIRST_STATE_ORDER from average users.

Enum Constant Summary

Enum Constants

Enum Constant	Description
FIRST_STATE_ORDER	The processElement call will be invoked on record arrival, but may be blocked at the first state accessing if there is a preceding same-key record under processing.
RECORD_ORDER	Treat the record processing as a whole, meaning that any processElement call for the elements with same key should follow the order of record arrival AND no parallel run is allowed.

Method Summary

Modifier and Type	Method	Description
static ElementOrder	valueOf(String name)	Returns the enum constant of this type with the specified name.
static ElementOrder[]	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

RECORD_ORDER

public static final ElementOrder RECORD_ORDER

Treat the record processing as a whole, meaning that any processElement call for the elements with same key should follow the order of record arrival AND no parallel run is allowed.

FIRST_STATE_ORDER

public static final ElementOrder FIRST_STATE_ORDER

The processElement call will be invoked on record arrival, but may be blocked at the first state accessing if there is a preceding same-key record under processing.

Method Detail

values

public static ElementOrder[] 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 (ElementOrder c : ElementOrder.values())
    System.out.println(c);

Returns:

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

valueOf

public static ElementOrder 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