Ooops, sorry, you are right. Not only the resource Id, but the lock
*itself* must be the same in both threads.
Doing it this way:
final ReadWriteLock fileLock = new ReadWriteLock("Huhu",
loggerFacade);
Runnable run = new Runnable() {
public void run() {
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());
} catch (InterruptedException e) {
e.printStackTrace(System.err);
} finally {
fileLock.release(Thread.currentThread());
}
}
};
Thread t1 = new Thread(run, "Thread1");
Thread t2 = new Thread(run, "Thread2");
t1.start();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
t2.start();
works fine for me.
HTH
Oliver
On 7/6/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> Oliver,
>
> I tried your suggestion by changing my ReadWriteLock statement to
>
> ReadWriteLock fileLock = new ReadWriteLock("c:/logRec.txt",loggerFacade);
>
> However, I received the same results as when I used new File(..).
>
> LeRoy
>
>
>
>
>
>
> Oliver Zeigermann
> <oliver.zeigerman
> [EMAIL PROTECTED]>
> To
> Jakarta Commons Users List
> 07/06/2005 01:44 <[email protected]>
> AM cc
>
> Subject
> Please respond to Re: Transaction API, ReadWriteLock
> "Jakarta Commons
> Users List"
> <[EMAIL PROTECTED]
> arta.apache.org>
>
>
>
>
>
>
> 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, [EMAIL PROTECTED] <[EMAIL PROTECTED]> 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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> > For additional commands, e-mail: [EMAIL PROTECTED]
> >
> >
>
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