Package org.infinispan.lock.api

Interface ClusteredLockManager

All Known Implementing Classes:

EmbeddedClusteredLockManager

public interface ClusteredLockManager

Provides the API to define, create and remove ClusteredLocks.

Since:

9.2

Author:

Katia Aresti, karesti@redhat.com

Method Summary

Modifier and Type	Method	Description
boolean	defineLock(String name)	Defines a lock with the specific name and the default ClusteredLockConfiguration.
boolean	defineLock(String name, ClusteredLockConfiguration configuration)	Defines a lock with the specific name and ClusteredLockConfiguration.
CompletableFuture<Boolean>	forceRelease(String name)	Releases - or unlocks - a ClusteredLock if such exists.
ClusteredLock	get(String name)	Get’s a ClusteredLock by it’s name.
ClusteredLockConfiguration	getConfiguration(String name)	Returns the configuration of a ClusteredLock, if such exists.This method throws ClusteredLockException if the lock is not not defined.
boolean	isDefined(String name)	Checks if a lock is already defined.
CompletableFuture<Boolean>	remove(String name)	Removes a ClusteredLock if such exists.

Method Details

defineLock

boolean defineLock(String name)

Defines a lock with the specific name and the default ClusteredLockConfiguration. It does not overwrite existing configurations. Returns true if successfully defined or false if the lock is already defined or any other failure.

Parameters:

name - , the name of the lock

Returns:

true if the lock was successfully defined

defineLock

boolean defineLock(String name,
 ClusteredLockConfiguration configuration)

Defines a lock with the specific name and ClusteredLockConfiguration. It does not overwrite existing configurations. Returns true if successfully defined or false if the lock is already defined or any other failure.

Parameters:

name - , the name of the lock

configuration - , a ClusteredLockConfiguration object with the configuration of the lock

Returns:

true if the lock was successfully defined

get

ClusteredLock get(String name)

Get’s a ClusteredLock by it’s name. This method throws ClusteredLockException if the lock is not not defined. A call of defineLock(java.lang.String) must be done at least once in the cluster. This method will return the same lock object depending on the OwnershipLevel. If the OwnershipLevel is OwnershipLevel.NODE, it wll return the same instance per ClusteredLockManager If the OwnershipLevel is OwnershipLevel.INSTANCE, it wll return a new instance per call.

Parameters:

name - , the name of the lock

Returns:

ClusteredLock instance

getConfiguration

ClusteredLockConfiguration getConfiguration(String name)

Returns the configuration of a ClusteredLock, if such exists.This method throws ClusteredLockException if the lock is not not defined. A call of defineLock(java.lang.String) must be done at least once in the cluster.

Parameters:

name - , the name of the lock

Returns:

ClusteredLockConfiguration for this lock

isDefined

boolean isDefined(String name)

Checks if a lock is already defined.

Parameters:

name - , the lock name

Returns:

true if this lock is defined

remove

CompletableFuture<Boolean> remove(String name)

Removes a ClusteredLock if such exists.

Parameters:

name - , the name of the lock

Returns:

true if the lock is removed

forceRelease

CompletableFuture<Boolean> forceRelease(String name)

Releases - or unlocks - a ClusteredLock if such exists. This method is used when we just want to force the release the lock no matter who is holding it at a given time. Calling this method may cause concurrency issues and has to be used in exceptional situations.

Parameters:

name - , the name of the lock

Returns:

true if the lock has been released