/ 
POE-Component-Client-MogileFS-0.02
River stage one • 1 direct dependent • 1 total dependent
/ POE::Component::Client::MogileFS

NAME

POE::Component::Client::MogileFS - an async MogileFS client for POE

VERSION

Version 0.02

SYNOPSIS

use POE qw(Component::Client::MogileFS);

my $num = 500;
my @tasks;
foreach (1..$num) {
    my $key = $_ .'x'. int(rand($num)) . time();
    my $data = $key x 1000;
    push @tasks, {
        method => 'store_content',
        domain => 'testdomain',
        trackers => [qw/192.168.0.31:6001/],
        args => [$key, 'testclass', $data],
        taskname => $key.':testclass:testdomain',
    };
}

POE::Session->create(
    inline_states => {
        _start => \&start_session,
        storesomestuff => \&storesomestuff,
        debugging => \&debugging,
    }
);

sub start_session {
    my ($kernel, $heap, $session) = @_[KERNEL, HEAP, SESSION];
    POE::Component::Client::MogileFS->spawn(
        alias => 'mog',
        max_concurrent => 50,
        result => [$session, 'storesomestuff'],
        debug => [$session, 'debugging'],
    );
    $kernel->post('mog', 'add_tasks', \@tasks);
}

my $count = 0;
sub storesomestuff {
    my ($kernel,$result) = @_[KERNEL,ARG0];
    if ($result->{status}) {
        $count++;
        print "$count RESULT ".$result->{task}->{taskname};
        print " SUCCESS ".$result->{status}."\n";
    }
    else {
        print "$count RESULT ".$result->{task}->{taskname};
        print " FAILED\n";
        $kernel->post('mog', 'add_tasks', [$result->{task}]);
    }
    $kernel->post('mog', 'shutdown') if $count == $num;
}

sub debugging {
    my $result = $_[ARG0];
    print "DEBUG $result\n";
}

$poe_kernel->run();

DESCRIPTION

POE::Component::Client::MogileFS is a POE component that uses Wheel::Run
to fork off child processes which will execute MogileFS::Client methods
with your provided data asyncronously.  By default it will not allow more
than 10 concurrent connections, but you can adjust that as needed.

This is my first go at a POE::Component so the api may change in future,
and I'm really open to suggestions for improvement/features.

FUNCTIONS

spawn

Can take the following arguments:

  alias => 'alias of mogilefs session or __PACKAGE__ by default',
  max_concurrent => 'max number of concurrent children - default 10',
  result => ['session alias or id', 'eventname'],
  debug => ['session alias or id', 'eventname'],
  todo => ['list of hashes of jobs todo']

session_id

Returns the session id

add_tasks

$kernel->post('session', 'add_tasks', \@tasks);

Takes an arraref of hashes, each hash represents one MogileFS::Client method
to call and should have the following keys:

{method => 'MogileFS::Client method name',
 domain => 'domain to use',
 trackers => [array ref of trackers],
 args => [arrayref, of, args, for, method],
 taskname => 'name of this task',
}

shutdown

$kernel->post('session', 'shutdown');

Kills the MogileFS session and cleans up.

result

If result is set in spawn, then your event will get a hashref in ARG0.

$_[ARG0]->{status} is whatever is returned from the MogileFS method you
called, typically undef means it failed.

$_[ARG0]->{task} is the task you originally gave add_task.

This should allow you to retry if something fails and it's appropriate to
do so (the synopsis contains an example of doing so, using store_content).

debug

Returns back all the warnings and errors MogileFS::Client will spew in
ARG0.  Mostly just useful for debugging.

STUFF

This module is kinda simplistic in what MogileFS::Client methods you can
use.  Essentially all it does is create a new MogileFS::Client object in
each child, call the method you provide on that object with the arguments
you specified and return the result.  Obviously this won't work for any
methods that want more than one operation on the same object.  For example
my $fh = $mogc->newfile( ... ); print $fh 'foobar'; close $fh; isn't going
to work.  Instead use store_content;

The session won't go away until you shutdown.  This is to allow you to do
things like this:

$kernel->post('session', 'add_tasks', \@tasks);
$kernel->post('session', 'add_tasks', \@moretasks);

and to re-add your tasks from result if they failed.

AUTHOR

mock, <mock at obscurity.org>

BUGS

Please report any bugs or feature requests to bug-poe-component-client-mogilefs at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=POE-Component-Client-MogileFS. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc POE::Component::Client::MogileFS

You can also look for information at:

COPYRIGHT & LICENSE

Copyright 2007 RJ Research, Inc, all rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.