Extends or encapsulate queue layers

Typically i prefer encapsulation over extensions but if you want to pass around the Corley\Queue\Queue in your application in order to drop-out the proxy whenever you want maybe extensions is more interesting

<?php
use Corley\Queue\Queue;

class MyService
{
    public function __construct(Queue $queue) { }
    /** ... */
}

class QueueProxy extends Queue {} // valid as Queue object

class QueueProxy // not a Queue object
{
    public function __construct(Queue $queue) {}
}

If you consider the Queue object as a project boundary probably encapsulation is more interesting.

Encapsulation

If you have a serializer component, you want to abstract queue options and wrap the queue instance, probably encapsulation is more interesting

class QueueProxy
{
    public function __construct(Queue $queue, Serializer $serializer) {}

    // the send operation uses the serializer to normalize the incoming message object
   
    // the receive operation uses the serializer to denormalize the outcoming message representation

    // the serializer could also be used to normalize options for different queue adapters
}