Re: [jgroups-dev] anyway to do unlock in another thread

This is a hack. I'd rather fix the original code which doesn't release 
the lock, to release it in a finally clause. I consider not releasing a 
lock a bug.

On 4/28/13 6:57 AM, hyliu wrote:
> I find a way, I know it's ugly, but it seems no better choice.
>
> customize CENTRAL_LOCK, add a hack to let the new thread pretend the
> original thread. code is below. I tested it works.
>
> public class OptimizedCENTRAL_LOCK extends CENTRAL_LOCK {
>      public static ThreadLocal<Long> threadId = new ThreadLocal<Long>();
>      @Override
>      protected Owner getOwner() {
>          Long hackId = threadId.get();
>          if (hackId != null){
>              return new Owner(local_addr, hackId);
>          }
>          return super.getOwner();
>      }
>
>      public static void pretendThread(long originalThreadId){
>          threadId.set(originalThreadId);
>      }
>
>      public static void unpretendThread(){
>          threadId.remove();
>      }
> }
>
> the jmx bean to cleanup lock is below:
>      public boolean unLock(String lockName, long originalLockThreadId) {
>          try {
>              OptimizedCENTRAL_LOCK.pretendThread(originalLockThreadId);
>              lockService_.getLock(lockName).unlock();
>          } finally {
>              OptimizedCENTRAL_LOCK.unpretendThread();
>          }
>          return true;
>      }
>
> original lock thread id is can be get from LockService.printLocks()
>
> ...any side effect in this way?


-- 
Bela Ban, JGroups lead (http://www.jgroups.org)

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