LockStrategy


1   /*
2    * JBoss, the OpenSource J2EE webOS
3    *
4    * Distributable under LGPL license.
5    * See terms of license at gnu.org.
6    */
7   package org.jboss.cache.lock;
8   
9   import java.util.concurrent.locks.Lock  ;
10  
11  /**
12   * Interface to specify lock strategy, e.g., for different isolation levels.
13   *
14   * @author Ben Wang
15   */
16  public interface LockStrategy
17  {
18     /**
19      * Return a read lock object.
20      */
21     Lock   readLock();
22  
23  
24     /**
25      * Return a write lock object.
26      */
27     Lock   writeLock();
28  
29     /**
30      * Attempt to upgrade the current read lock to write lock with
31      * <code>msecs</code> timeout.
32      *
33      * @param msecs Timeout in milliseconds.
34      * @return Lock object. Will return null if timeout or failed.
35      */
36     Lock   upgradeLockAttempt(long msecs) throws UpgradeException;
37  }
38

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