MINA (0.9.4) blocks with unbindAll while serveral clients were connected
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Key: DIRMINA-246
URL: http://issues.apache.org/jira/browse/DIRMINA-246
Project: Directory MINA
Issue Type: Bug
Affects Versions: 0.9.4
Environment: Windows XP, JDK 1.5.06
Reporter: Frederic Bregier
Attachments: 2dumps.txt
After a post on the mailing list, as asked, I post a JIRA request:
I wanted to offer a function to shutdown gracefully the server,
that is to say that the server doesn't accept new connection,
but does let already connected client to finished correctly
their session (which are multi messages related).
In the beginning I used:
- setDisconnectOnUnbind(false)
- unbindAll()
- wait in my business logic that all already connected users shutting down
- setDisconnectOnUnbind(true)
- unbindAll()
I've got a lot of freeze (using 6 clients making a lot of messages)
in either the first or the second unbindAll().
So I simplify like this:
- I am waiting in my business logic that all already connected users shutting
down and does not accept new connection by hand (business logic).
To make that, when I have the global static boolean shutdown as True,
every new connexion are immediately closed by the server.
Also, every pending connexion will finished their session, and when
finished, the server also closed the connexion.
The session used to send the shutdown order is closed immediately
after receiving the order.
- setDisconnectOnUnbind(true)
- unbindAll()
I still have easily a freeze in the server during the call to
unbindAll().
- If I have only 1 client, unbindAll is never blocking.
- If I have 2 to 6 clients, making their stuff, they all disconnected
correctly from the server (the server is closing the session itself).
I saw that every clients are getting correctly the closed event.
But the server often blocks during the call of unbindAll().
I am no able at this time to see where is the problem in MINA.
Everything seems ok for me from the point of vue of a programmer
using MINA. But I surely make some mistakes since it seems
that I am the only one to have this problem.
Could it be related to the fact that this is the server that is
forcing the close of the session ?
The only thing I can tell now is that it is blocling during the
call of unbindAll() in the server part.
I attached two thread dumps in one file : the first is when the server is
completely started and functionnal, the second after it blocks.
I generate these dump using jdb since I was not able to generate them directly).
I hope this can clarify where is the problem.
Frederic Bregier
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