Question

How can I write or update session data before a request ends in Perl MVC Catalyst Framework.
I am using Session::State::Cookie and Session::Store::FastMap

I need to ensure that the data is available before the long-running request completes

Answer 1

This is what worked for me.

To ensure the information is updated at the time it is set in the long running request, I do a $c->finalize_session just after updating some importante information related to the session:

$c->session->{important_info} = "new value";
$c->finalize_session;

I verified that the other requests are gathering the right value after that.

I did not observed any side effects calling $c->finalize_session many times during a request just to ensure the session data to be updated, but I am not certained about this.

One of the informations that I am setting in this way is a counter to update a progress bar to feedback the user (because this task takes a long time). I do not know if it is the best way to do that, I will appreciate any suggestion.