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);
</code></pre>

<p>We wrapped a simple Moose class around Minion to make it easy to add to any class or Dancer application with the extra functionality we wanted.</p>

<p>We ran into an issue at one point where jobs weren&#39;t running since we added them to a queue that no worker was configured to handle. To prevent this from happening to us again,
we added code to prevent us from adding code to a queue that didn&#39;t exist:</p>

<pre><code>my @QUEUE_TYPES = qw( default InstantXML PayrollXML ChangeRequest );

sub has_invalid_queues( $self, @queues ) {
    return 1 if $self-&gt;get_invalid_queues( @queues );
    return 0;
}

sub get_invalid_queues( $self, @queues ) {
    my %queue_map;
    @queue_map{ @QUEUE_TYPES } = ();
    my @invalid_queues = grep !exists $queue_map{ $_ }, @queues;
    return @invalid_queues;
}
</code></pre>

<p>With that in place, it was easy for our <code>queue_job()</code> method to throw an error if the developer tried to add a job to an invalid queue:</p>

<pre><code>sub queue_job( $self, $args ) {