LockManager (Commons Transaction 1.3-SNAPSHOT API)

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All Known Implementing Classes:

GenericLockManager, ReadWriteLockManager, ReadWriteUpgradeLockManager
```
public interface LockManager
```
A manager for multi level locks on resources. Encapsulates creation, removal, and retrieval of locks. Each resource can have at most a single lock. However, it may be possible for more than one accessing entity to have influence on this lock via different lock levels that may be provided by the according implementation of MultiLevelLock.

Version:

$Id: LockManager.java 493628 2007-01-07 01:42:48Z joerg $

See Also:
MultiLevelLock

Method Summary

Methods
Modifier and Type	Method and Description
`MultiLevelLock`	`atomicGetOrCreateLock(Object resourceId)` Either gets an existing lock on the specified resource or creates one if none exists.
`MultiLevelLock`	`getLock(Object resourceId)` Gets an existing lock on the specified resource.
`void`	`removeLock(MultiLevelLock lock)` Removes the specified lock from the associated resource.

- Method Detail
  - atomicGetOrCreateLock
```
MultiLevelLock atomicGetOrCreateLock(Object resourceId)
```
    Either gets an existing lock on the specified resource or creates one if none exists. This methods guarantees to do this atomically.
    
    Parameters:
    resourceId - the resource to get or create the lock on
    
    Returns:
    the lock for the specified resource
  - getLock
```
MultiLevelLock getLock(Object resourceId)
```
    Gets an existing lock on the specified resource. If none exists it returns null.
    
    Parameters:
    resourceId - the resource to get the lock for
    
    Returns:
    the lock on the specified resource
  - removeLock
```
void removeLock(MultiLevelLock lock)
```
    Removes the specified lock from the associated resource.
    
    Parameters:
    lock - the lock to be removed

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