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Author image Marty O'Brien

NAME

Forks::Queue::File - file-based implementation of Forks::Queue

VERSION

0.14

SYNOPSIS

    my $q = Forks::Queue::File->new( file => "queue-file" );
    $q->put( "job1" );
    $q->put( { name => "job2", task => "do something", data => [42,19] } );
    ...
    $q->end;
    for my $w (1 .. $num_workers) {
        if (fork() == 0) {
            my $task;
            while (defined($task = $q->get)) {
                ... perform task in child ...
            }
            exit;
        }
    }

METHODS

See Forks::Queue for an overview of the methods supported by this Forks::Queue implementation.

new

$queue = Forks::Queue::File->new( %opts )

$queue = Forks::Queue->new( impl => 'File', %opts )

The Forks::Queue::File constructor recognized the following configuration options.

  • file

    The name of the file to use to score queue data and metadata. If omitted, a temporary filename is chosen.

    It is strongly recommended not to use a file that would reside on an NFS filesystem, since these filesystems have notorious difficulty with synchronizing files across processes.

  • style

  • limit

  • on_limit

  • join

  • persist

    See "new" in Forks::Queue for descriptions of these options.

  • debug

    Boolean value to enable or disable debugging on this queue, overriding the value in $Forks::Queue::DEBUG.

  • dflock

    Boolean value to enable directory-based alternative to flock for synchronization of the queue across processeses. The module will often be able to guess whether this flag should be set by default, but it should be used explicitly in some cases such as sharing a queue over processes on different hosts accessing a shared, networked filesystem.

BUGS AND LIMITATIONS

As with anything that requires flock, you should avoid allowing the queue file to reside on an NFS drive.

LICENSE AND COPYRIGHT

Copyright (c) 2017-2019, Marty O'Brien.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or, at your option, any later version of Perl 5 you may have available.

See http://dev.perl.org/licenses/ for more information.