de.aristaflow.adept2.util.locking

Interface LockCountManager<L>

Type Parameters:

L - The type of objects of which the lock acquisitions are to be counted by this lock count manager (lock owning type).

All Known Implementing Classes:

ObjectEqualityLockCount, SessionLock.ChildSessionIDLockCount, SessionLock.SessionTreePathLockCount, SessionLock.SubsessionLockCount, SessionLock.UUIDLockCount

public interface LockCountManager<L>

A LockCountManager provides the means to manage reentrant locks based on objects by counting lock acquisitions. This also encapsulates how objects are compared. If two objects are to be equal, hasLock(Object), increaseAndGetLockCount(Object) as well as decreaseAndGetLockCount(Object) have to be implemented accordingly.

Author:

Ulrich Kreher

Method Summary

Modifier and Type	Method and Description
int	decreaseAndGetLockCount(L object) Decreases the number of times the designated object holds the lock.
java.lang.String	getLockOwner() Returns a string representation of one object that currently has a lock.
boolean	hasLock(L object) Returns whether the designated object has a lock at least once.
boolean	hasLocks() Returns whether this lock count manager knows at least one object that has a lock.
int	increaseAndGetLockCount(L object) Increases the number of times the designated object holds the lock.

Method Detail

hasLock

boolean hasLock(L object)

Returns whether the designated object has a lock at least once.

Parameters:

object - The object which is checked whether it holds a lock.

Returns:

Whether the designated object has a lock at least once.

hasLocks

boolean hasLocks()

Returns whether this lock count manager knows at least one object that has a lock.

Returns:

Whether at least one object has a lock.

getLockOwner

java.lang.String getLockOwner()

Returns a string representation of one object that currently has a lock. This can be used for user information or tracking purpose. A locking object may not be returned since this would allow to unlock.

Returns:

A string representation of one object that currently has a lock.

increaseAndGetLockCount

int increaseAndGetLockCount(L object)

Increases the number of times the designated object holds the lock.

Parameters:

object - The object which has acquired the lock (once again).

Returns:

The number of times the designated object has the lock after the increment.

decreaseAndGetLockCount

int decreaseAndGetLockCount(L object)

Decreases the number of times the designated object holds the lock. If the object does not hold the lock, the decrement will be ignored.

Parameters:

object - The object which has released the lock (once again).

Returns:

The number of times the designated object has the lock after the decrement.