ee.telekom.workflow.core.lock

Class LockServiceImpl

java.lang.Object

ee.telekom.workflow.core.lock.LockServiceImpl

All Implemented Interfaces:

LockService

@Service
 @Transactional(propagation=NOT_SUPPORTED)
public class LockServiceImpl
extends Object
implements LockService

Manages an exclusive distributed lock per cluster to avoid multiple master.

Constructor Summary

Constructors

Constructor and Description
LockServiceImpl()

Method Summary

Modifier and Type	Method and Description
boolean	acquireLock() Attempts to acquire the cluster's lock
boolean	eagerAcquire() Releases expired locks and afterwards attempts to refresh its own lock or acquire the lock.
Date	getLockExpireDate() Returns the locks expire date or null if no cluster is not locked.
String	getLockOwner() Returns the cluster's lock owner.
boolean	isOwnLock()
boolean	refreshOwnLock() Attempts to refresh the owned lock.
boolean	releaseExpiredLock() Attempt to release the cluster's lock if it has expired.
boolean	releaseOwnLock() Releases the owned lock.

Methods inherited from class java.lang.Object

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

Constructor Detail

LockServiceImpl

public LockServiceImpl()

Method Detail

eagerAcquire

public boolean eagerAcquire()

Description copied from interface: LockService

Releases expired locks and afterwards attempts to refresh its own lock or acquire the lock.

Specified by:

eagerAcquire in interface LockService

Returns:

true, if lock is owned. Otherwise false.

acquireLock

public boolean acquireLock()

Description copied from interface: LockService

Attempts to acquire the cluster's lock

Specified by:

acquireLock in interface LockService

Returns:

true, if lock was acquired. Otherwise false.

isOwnLock

public boolean isOwnLock()

Specified by:

isOwnLock in interface LockService

Returns:

true, if lock is owned by this node. Otherwise false.

refreshOwnLock

public boolean refreshOwnLock()

Description copied from interface: LockService

Attempts to refresh the owned lock. Refreshing the lock means to postpone its expiration date.

Specified by:

refreshOwnLock in interface LockService

Returns:

true, if lock was refreshed. Otherwise false.

releaseOwnLock

public boolean releaseOwnLock()

Description copied from interface: LockService

Releases the owned lock.

Specified by:

releaseOwnLock in interface LockService

Returns:

true, if lock was released. Otherwise false.

releaseExpiredLock

public boolean releaseExpiredLock()

Description copied from interface: LockService

Attempt to release the cluster's lock if it has expired.

Specified by:

releaseExpiredLock in interface LockService

Returns:

true, if the lock was expired and is now released.

getLockOwner

public String getLockOwner()

Description copied from interface: LockService

Returns the cluster's lock owner.

Specified by:

getLockOwner in interface LockService

Returns:

the cluster's lock owner.

getLockExpireDate

public Date getLockExpireDate()

Description copied from interface: LockService

Returns the locks expire date or null if no cluster is not locked.

Specified by:

getLockExpireDate in interface LockService

Returns:

the locks expire date or null if no cluster is not locked.