Apache::Session::FIle Locking Mechanism

py_201 has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks,

I have implemented Apache::Session::File for session management in my web application. For that we specify Directory and Lock Directory while tieing the session and what i have observed is that for each session_id, it creates one file named after session_id in the directory and two files in LockDirectory, out of which one is named after session_id and other one has some random number in its name.

what significance does these lock files have in session handling here?

Different requests to my web application(which can be concurrent also) alter session data in different ways. so sometimes session data gets lost in between those requests.

so my queries regarding sessions are:

What can i do to handle this data corruption? How Apache::Session::File handles concurrent access(for read,write) to session data.

Does Apache::Session::File provides some built in data locking mechanism. if yes, how does that work?

Any help would be appreciated.

Comment on Apache::Session::FIle Locking Mechanism

Replies are listed 'Best First'.
Re: Apache::Session::FIle Locking Mechanism by Anonymous Monk on Sep 17, 2009 at 07:39 UTC
All of those questions are adressed in Apache::Session	[reply]
Re^2: Apache::Session::FIle Locking Mechanism by py_201 (Acolyte) on Sep 17, 2009 at 08:51 UTC
its being stated there that Apache::Session::File provides locking with the help of files created in LockDirectory specified.My question is how they function internally . why does it create two files there. when we read or write some data in session , how do we get access to session file through these lock files why are two files created. what is their exact functionality in term of locking. what are all the things that i can do to prevent data corruption or loss between different requests.	[reply]
Re^3: Apache::Session::FIle Locking Mechanism by Anonymous Monk on Sep 17, 2009 at 14:33 UTC
When you're reading Apache::Session, click the Source link.	[reply]
Re^2: Apache::Session::FIle Locking Mechanism by Anonymous Monk on Sep 17, 2009 at 15:43 UTC
SORRY... lalit	[reply]
Re: Apache::Session::FIle Locking Mechanism by Anonymous Monk on Sep 17, 2009 at 15:26 UTC
HI Py.. Dude i have same prob. I am also trying to find out the solution of this. Infact, i got one solution for this, when u tie your application session, set Transaction attribute 1. I think this will definately help u. And in coming days, whenever u got something abt it, pls make me inform. My username is lalitbans on perlmonks and my email id is lbansal@gist.in. Hope this will help u. `tie %session, 'Apache::Session::MySQL', $session_id, { DataSource => 'dbi:mysql:sessions', Transaction => '1', };` [download] Hope 2 c u soon.. Bye..	[reply] [d/l]

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