org.apache.flink.runtime.state

Class StateUtil

java.lang.Object

org.apache.flink.runtime.state.StateUtil

public class StateUtil
extends Object

Helpers for StateObject related code.

Method Summary

Modifier and Type	Method and Description
static void	bestEffortDiscardAllStateObjects(Iterable<? extends StateObject> handlesToDiscard) Iterates through the passed state handles and calls discardState() on each handle that is not null.
static void	discardStateFuture(RunnableFuture<? extends StateObject> stateFuture) Discards the given state future by first trying to cancel it.
static long	getStateSize(StateObject handle) Returns the size of a state object

Methods inherited from class java.lang.Object

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

Method Detail

getStateSize

public static long getStateSize(StateObject handle)

Returns the size of a state object

Parameters:

handle - The handle to the retrieved state

bestEffortDiscardAllStateObjects

public static void bestEffortDiscardAllStateObjects(Iterable<? extends StateObject> handlesToDiscard)
                                             throws Exception

Iterates through the passed state handles and calls discardState() on each handle that is not null. All occurring exceptions are suppressed and collected until the iteration is over and emitted as a single exception.

Parameters:

handlesToDiscard - State handles to discard. Passed iterable is allowed to deliver null values.

Throws:

Exception - exception that is a collection of all suppressed exceptions that were caught during iteration

discardStateFuture

public static void discardStateFuture(RunnableFuture<? extends StateObject> stateFuture)
                               throws Exception

Discards the given state future by first trying to cancel it. If this is not possible, then the state object contained in the future is calculated and afterwards discarded.

Parameters:

stateFuture - to be discarded

Throws:

Exception - if the discard operation failed