NAME

Foorum::Manual::Tutorial2 - Tutorial 2: Dive into Foorum: TheSchwartz

TheSchwartz introduction

As CPAN perldoc says: reliable job queue. Basically it splitted into two parts, one is worker while the other is client.

Worker script:

We may have several workers to deal with different tasks. For example TheSchwartz_worker.pl deal with some tasks while TheSchwartz_worker_scraper.pl deal with scraper task.

What's worker for? In my idea, that's just a script to monitor a table in database (check if there is any task to do) every 5 secs. Faked code like this:

while (1) {
    # check if there is any new TODO task in one table of theschwartz database.
    if ($has_new_task) { # scalar @new_tasks
        foreach my $new_task (@new_tasks) {
            $new_task->worker();
        }
    }
    sleep 5;

Where does new task from? Foorum has two ways, always one is form Foorum/Controller|Model, the other is from cron scripts.

example code:

in Foorum/Model

use Foorum::ExternalUtils qw/theschwartz/;
my $client = theschwartz();
$client->insert(
    'Foorum::TheSchwartz::Worker::WorkerExample',
    @args
);

in cron script. http://foorum.googlecode.com/svn/trunk/bin/cron/TheSchwartz_client.pl

That's a simple introduction. Maybe I'm wrong here. :)

Worker in Foorum

For now, we have several workers:

Foorum::TheSchwartz::Worker::DailyChart
Foorum::TheSchwartz::Worker::DailyReport
Foorum::TheSchwartz::Worker::Hit
Foorum::TheSchwartz::Worker::RemoveOldDataFromDB
Foorum::TheSchwartz::Worker::ResizeProfilePhoto
Foorum::TheSchwartz::Worker::SendScheduledEmail
Foorum::TheSchwartz::Worker::SendStarredNofication
etc.

There is a simple RULES that why we use TheSchwartz, put heavy code on backend script instead of httpd.

Hit is a cron script to update topic hits and Popular.
RemoveOldDataFromDB - remove useless data from database because it's outdated.
ResizeProfilePhoto - let httpd load Image::Magick is not so good.
SendScheduledEmail - send email, web insert data into table then this worker send email behind
SendStarredNofication - oh, typo here, should be Notification. ;)

How to write a Worker in Foorum?

OK, please borrow code from exist ones.

NAME

TheSchwartz introduction

Worker in Foorum

How to write a Worker in Foorum?

SEE ALSO