Package org.keycloak.models.map.storage.hotRod.locking

Class HotRodLocksUtils

java.lang.Object

org.keycloak.models.map.storage.hotRod.locking.HotRodLocksUtils

public class HotRodLocksUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SEPARATOR

Constructor Summary

Constructors

Constructor	Description
HotRodLocksUtils()

Method Summary

Modifier and Type	Method	Description
static boolean	removeWithInstanceIdentifier(ConcurrentMap<String,String> map, String lockName)	Removes the entry with key lockName from map if the value of the entry is equal to this node's identifier
static void	repeatPutIfAbsent(org.infinispan.client.hotrod.RemoteCache<String,String> locksCache, String lockName, Duration timeout, int repeatInterval, boolean isReentrant)	Repeatedly attempts to put an entry with the key lockName to the locksCache.

Methods inherited from class java.lang.Object

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

Field Details

SEPARATOR

public static final String SEPARATOR

See Also:

• Constant Field Values

Constructor Details

HotRodLocksUtils

public HotRodLocksUtils()

Method Details

repeatPutIfAbsent

public static void repeatPutIfAbsent(org.infinispan.client.hotrod.RemoteCache<String,String> locksCache,
 String lockName,
 Duration timeout,
 int repeatInterval,
 boolean isReentrant)
                              throws LockAcquiringTimeoutException

Repeatedly attempts to put an entry with the key lockName to the locksCache. Succeeds only if there is no entry with the same key already.

The value of created entry is equal to instance identifier. It is possible to make the method succeed even if the value already exists with the same instance identifier. This behaviour is enabled using isReentrant switch.

Execution of this method is time bounded, if this method does not succeed within timeoutMilliseconds it gives up and returns false.

There is a pause after each unsuccessful attempt equal to repeatInterval milliseconds

Parameters:

locksCache - Cache that will be used for putting the value

lockName - Name of the entry

timeout - duration to wait until the lock is acquired

repeatInterval - Number of milliseconds to wait after each unsuccessful attempt

isReentrant - if this is set to true, the method succeeds also when the value for given key is equal to the instance identifier

Throws:

LockAcquiringTimeoutException - the key lockName was NOT put into the map within time boundaries

IllegalStateException - when a lock value found in the storage has wrong format. It is expected the lock value has the following format 'timeAcquired;keycloakInstanceIdentifier'

removeWithInstanceIdentifier

public static boolean removeWithInstanceIdentifier(ConcurrentMap<String,String> map,
 String lockName)

Removes the entry with key lockName from map if the value of the entry is equal to this node's identifier

Parameters:

map - Map that will be used for removing

lockName - Name of the entry

Returns:

true if the entry was removed, false otherwise