This handler is the one in charge of reading from the queue and deciding what content is given to the queue handler. A default queueReader handler is provided with your default eZ Publish distribution. It simply reads the oldest inactive
item from the processes queue, and returns it.

It can be changed to a new one by implementing the "ezpContentPublishingQueueReaderInterface" and configuring the new class in "content.ini".

Here is a possible class definition::

    <?php
    class myPublishingQueue implements ezpContentPublishingQueueReaderInterface
    {
        public static function next()
        {
            // do your deeds...
            if ( $process )
                return $process;
           else
                return false;
        }
 
    ?>

And the matching INI (content.ini) configuration:

[PublishingSettings]
AsynchronousPublishingQueueReader=myContentPublishingQueue