Package org.infinispan.util.concurrent

Class ActionSequencer

java.lang.Object

org.infinispan.util.concurrent.ActionSequencer

public class ActionSequencer
extends Object

Orders multiple actions/tasks based on a key.

It has the following properties:

• If multiple actions have disjoint ordering keys, they are execute in parallel.
• If multiple actions have the same ordering keys, deadlocks are avoided between them.
• An action is only executed after the previous one is completed.

Since:

10.0

Author:

Pedro Ruivo

Constructor Summary

Constructors

Constructor	Description
ActionSequencer(Executor executor, boolean forceExecutor, TimeService timeService)

Method Summary

Modifier and Type	Method	Description
long	getAverageQueueTimeNanos()
long	getAverageRunningTimeNanos()
int	getMapSize()
long	getPendingActions()
long	getRunningActions()
<T> CompletionStage<T>	orderOnKey(Object key, Callable<? extends CompletionStage<T>> action)
<T> CompletionStage<T>	orderOnKeys(Collection<?> keys, Callable<? extends CompletionStage<T>> action)	It order a non-blocking action.
void	resetStatistics()
void	setStatisticEnabled(boolean enable)

Methods inherited from class java.lang.Object

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

Constructor Details

ActionSequencer

public ActionSequencer(Executor executor,
 boolean forceExecutor,
 TimeService timeService)

Parameters:

executor - Executor to run submitted actions.

forceExecutor - If false, run submitted actions on the submitter thread if possible. If true, always run submitted actions on the executor.

Method Details

orderOnKeys

public <T> CompletionStage<T> orderOnKeys(Collection<?> keys,
 Callable<? extends CompletionStage<T>> action)

It order a non-blocking action.

It assumes the action does not block the invoked thread and it may execute it in this thread or, if there is one or more pending actions, in a separate thread (provided by the executor).

Type Parameters:

T - The return value type.

Parameters:

keys - The ordering keys.

action - The Callable to invoke.

Returns:

A CompletableFuture that is completed with the return value of resulting CompletableFuture.

Throws:

NullPointerException - if any of the parameter is null.

orderOnKey

public <T> CompletionStage<T> orderOnKey(Object key,
 Callable<? extends CompletionStage<T>> action)

getPendingActions

public long getPendingActions()

getRunningActions

public long getRunningActions()

resetStatistics

public void resetStatistics()

getAverageQueueTimeNanos

public long getAverageQueueTimeNanos()

getAverageRunningTimeNanos

public long getAverageRunningTimeNanos()

setStatisticEnabled

public void setStatisticEnabled(boolean enable)

getMapSize

public int getMapSize()