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|
package presque::worker;
our $VERSION = '0.01';
use Carp;
use JSON;
use Try::Tiny;
use Moose::Role;
requires 'work';
with qw/
presque::worker::Role::Management
presque::worker::Role::Fork
presque::worker::Role::RESTClient
presque::worker::Role::Logger/;
has queue_name => (is => 'ro', isa => 'Str', required => 1);
has retries => (is => 'rw', isa => 'Int', default => 5);
has interval => (is => 'ro', isa => 'Int', lazy => 1, default => 1);
has _fail_method => (
is => 'rw',
isa => 'Bool',
lazy => 1,
default => 0,
predicate => '_has_fail_method'
);
has worker_id => (
is => 'ro',
isa => 'Str',
required => 1,
default => sub {
my $self = shift;
my $name = $self->meta->name . '_' . $$;
$name;
}
);
before start => sub {
my $self = shift;
if ($self->meta->find_method_by_name('fail')) {
$self->fail_method(1);
}
$self->logger->log(
level => 'info',
message => "presque worker ["
. $self->worker_id
. "] : start to listen for "
. $self->queue_name
);
};
around work => sub {
my ($orig, $self, $job) = @_;
$self->logger->log(
level => 'debug',
message => $self->worker_id . " start to work"
);
try {
if ($self->fork_dispatcher) {
my $fork = fork();
if ($fork == 0) {
$self->$orig($job);
}elsif($fork > 0){
return;
}else{
}
}
}catch{
my $err = $_;
$self->logger->log(
level => 'error',
message => 'Job failed: ' . $err,
);
$self->_job_failure($job, $err);
};
};
sub start {
my $self = shift;
while (!$self->shut_down) {
my $job = $self->rest_fetch_job();
$self->work($job) if $job;
sleep($self->interval);
}
}
sub _job_failure {
my ($self, $job, $err) = @_;
push @{$job->{fail}}, $err;
my $retries = ($job->{retries_left} || $self->retries) - 1;
$job->{retries_left} = $retries;
$self->rest_retry_job($job) if $retries > 0;
$self->fail($job, $_) if $self->_has_fail_method;
}
1;
__END__
=head1 NAME
presque::worker - a presque worker
=head1 SYNOPSIS
package myworker;
use Moose;
with 'presque::worker';
sub work {
my ($self, $job) = @_;
...
}
sub fail {
my ($self, $job, $error) = @_;
...
}
=head1 DESCRIPTION
presque::worker - Worker for the C<presque> message queue system
=head1 METHODS
=head2 work ($job_description)
Worker must implement the B<work> method. The only argument of this method is a hashref containing the job.
=head2 fail ($job_description, $error_reason)
Worker may implement the B<fail> method. This method have two arguments: the job description and the reason of the failure.
=head1 ATTRIBUTES
=head2 queue_name
=head2 base_uri
=head2 worker_id
=head2 retries
=head2 interval
=head2
The url of the presque webservices.
=head1 AUTHOR
franck cuny E<lt>franck@lumberjaph.netE<gt>
=head1 SEE ALSO
=head1 LICENSE
Copyright 2010 by Linkfluence
L<http://linkfluence.net>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
