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From Oliver Zeigermann <oliver.zeigerm...@gmail.com>
Subject Re: Transaction API, ReadWriteLock
Date Wed, 06 Jul 2005 06:44:32 GMT
Most likely your problem ist that new File(..) creates different
objects in each thread. I would try using something like the path to
the file as String.

Oliver

On 7/5/05, LeRoy.Yanta@securian.com <LeRoy.Yanta@securian.com> wrote:
> 
> 
> 
> 
> I'm trying to use the ReadWriteLock class to acquire a write lock on a file
> in a servlet.  When I generate multiple threads of the servlet using a WTE
> 5.1 server in the WSAD 5.1 IDE, I'm not able to get ReadWriteLock to block
> other servlet threads after the first servlet thread obtains the lock.  I'm
> using two IE browser windows to generate the two servlet threads.  Below is
> ReadWriteLock code I have in the servlet followed by the System.out.println
> statements that are generated in the server log file during my test.
> 
> ReadWriteLock fileLock = new ReadWriteLock(new File(c:/logRec.txt,
> loggerFacade);
> try {
>       System.out.println("before acquiring a lock " +
> Thread.currentThread());
>       boolean result =
> fileLock.acquireWrite(Thread.currentThread(),Long.MAX_VALUE);
>       System.out.println("lock result: " + result + " " +
> Thread.currentThread());
>       Thread.sleep(20000);
>       System.out.println("after sleeping " + Thread.currentThread());
>       FileWriter recFile = new FileWriter(c:/logRec.txt, true);
>       recFile.write("text from testFileTran");
>       recFile.close();
> } catch (InterruptedException e) {
>       e.printStackTrace(System.err);
> 
> } catch (IOException e) {
>       e.printStackTrace(System.err);
> 
> } finally {
>       fileLock.release(Thread.currentThread());
> }
> 
> [7/5/05 8:26:03:326 CDT]  7c1477e SystemOut     O before acquiring a lock
> Thread[Servlet.Engine.Transports : 0,5,main]
> [7/5/05 8:26:03:326 CDT]  7c1477e SystemOut     O lock result: true
> Thread[Servlet.Engine.Transports : 0,5,main]
> [7/5/05 8:26:08:384 CDT] 24c3477d SystemOut     O before acquiring a lock
> Thread[Servlet.Engine.Transports : 1,5,main]
> [7/5/05 8:26:08:384 CDT] 24c3477d SystemOut     O lock result: true
> Thread[Servlet.Engine.Transports : 1,5,main]
> [7/5/05 8:26:23:335 CDT]  7c1477e SystemOut     O after sleeping
> Thread[Servlet.Engine.Transports : 0,5,main]
> [7/5/05 8:26:28:382 CDT] 24c3477d SystemOut     O after sleeping
> Thread[Servlet.Engine.Transports : 1,5,main]
> 
> 
> From reviewing the Transaction documentation and mailing list archives, I'm
> not able to determine what I'm doing wrong.
> 
> 
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