org.apache.slide.util.locking.impl
Class GenericLockManager

java.lang.Object
  org.apache.slide.util.locking.impl.GenericLockManager

All Implemented Interfaces:

LockManager

public class GenericLockManager

extends java.lang.Object

implements LockManager

Manager for GenericLocks on resources.

Author:

Oliver Zeigermann

Field Summary

protected java.util.Map	globalLocks
protected StoreLogger	logger
protected int	maxLockLevel

Constructor Summary

GenericLockManager(int maxLockLevel, StoreLogger logger)

Method Summary

MultiLevelLock	atomicGetOrCreateLock(java.lang.Object resourceId) Either gets an existing lock on the specified resource or creates one if none exists.
protected GenericLock	createLock(java.lang.Object resourceId)
MultiLevelLock	getLock(java.lang.Object resourceId) Gets an existing lock on the specified resource.
java.util.Collection	getLocks() Gets all locks as orignials, no copies.
void	removeLock(MultiLevelLock lock) Removes the specified lock from the associated resource.

Methods inherited from class java.lang.Object

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

Field Detail

globalLocks

protected java.util.Map globalLocks

maxLockLevel

protected int maxLockLevel

logger

protected StoreLogger logger

Constructor Detail

GenericLockManager

public GenericLockManager(int maxLockLevel,
                          StoreLogger logger)
                   throws java.lang.IllegalArgumentException

Method Detail

getLock

public MultiLevelLock getLock(java.lang.Object resourceId)

Description copied from interface: LockManager

Gets an existing lock on the specified resource. If none exists it returns null.

Specified by:

getLock in interface LockManager

Parameters:

resourceId - the resource to get the lock for

Returns:

the lock on the specified resource

atomicGetOrCreateLock

public MultiLevelLock atomicGetOrCreateLock(java.lang.Object resourceId)

Description copied from interface: LockManager

Either gets an existing lock on the specified resource or creates one if none exists. This methods guarantees to do this atomically.

Specified by:

atomicGetOrCreateLock in interface LockManager

Parameters:

resourceId - the resource to get or create the lock on

Returns:

the lock for the specified resource

removeLock

public void removeLock(MultiLevelLock lock)

Description copied from interface: LockManager

Removes the specified lock from the associated resource.

Specified by:

removeLock in interface LockManager

Parameters:

lock - the lock to be removed

getLocks

public java.util.Collection getLocks()

Gets all locks as orignials, no copies.

Returns:

collection holding all locks.

createLock

protected GenericLock createLock(java.lang.Object resourceId)