All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class ncsa.habanero.ExclusiveLock

java.lang.Object
   |
   +----ncsa.habanero.Lock
           |
           +----ncsa.habanero.ExclusiveLock

public class ExclusiveLock

extends Lock

ExclusiveLock()

allows(Action)

This method is used when an action is being attempted, it checks to see if the action is allowed.

blocks(Action)

This method is executed when the application attempts an action without a lock.

consistent(Lock)

This routine is used to determine if this lock can coexist with this older lock.

equals(Object)

Used to compare locks

keyWorksWith(Lock)

The user has the key to the current lock, is the lock still legal.

releaseAfterUsing()

Should this lock be released after it has been used only once

 public ExclusiveLock()

Returns:

an exclusive lock, only one of these may be created at any time

 public boolean allows(Action act)

This method is used when an action is being attempted, it checks to see if the action is allowed.

Parameters:

act - the action that is being attempted

Returns:

true, always, this lock allows anything to be done

Overrides:

allows in class Lock

 public boolean blocks(Action act)

This method is executed when the application attempts an action without a lock.

Parameters:

act - the action that is being attempted without a lock

Returns:

returns true if the action is not allowed by the lock, an exclusive lock doesn't let anything happen while it exists

Overrides:

blocks in class Lock

 public boolean consistent(Lock lkdRequest)

This routine is used to determine if this lock can coexist with this older lock.

Parameters:

lkdRequest - the other lock that is attempted

Returns:

false, always this lock conflicts with anything

Overrides:

consistent in class Lock

 public boolean keyWorksWith(Lock ldRequest)

The user has the key to the current lock, is the lock still legal.

Parameters:

ldRequest - the request that the user is making

Returns:

always returns false, this is the only lock that can exist

Overrides:

keyWorksWith in class Lock

 public boolean releaseAfterUsing()

Should this lock be released after it has been used only once

Returns:

always returns true, since it maintains such a strong hold on actions

Overrides:

releaseAfterUsing in class Lock

 public boolean equals(Object another)

Used to compare locks

Parameters:

another - the other lock

Returns:

always true

Overrides:

equals in class Lock

All Packages  Class Hierarchy  This Package  Previous  Next  Index