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<?php

namespace SAREhub\Commons\Zmq\PublishSubscribe;

class ZmqForwarderDeviceBuilder
{

    /**
     * @var Subscriber
     */
    private $frontend;

    /**
     * @var Publisher
     */
    private $backend;

    /**
     * @var callable
     */
    private $timerCallback;

    /**
     * @param Subscriber $subscriber
     * @return $this
     */
    public function frontend(Subscriber $subscriber)
    {
        $this->frontend = $subscriber;
        return $this;
    }

    /**
     * @param Publisher $publisher
     * @return $this
     */
    public function backend(Publisher $publisher)
    {
        $this->backend = $publisher;
        return $this;
    }

    public function build()
    {
        if (empty($this->frontend->getTopics())) {
            $this->frontend->subscribeAll();
        }

        $device = new \ZMQDevice($this->frontend->getSocket(), $this->backend->getSocket());
        return new ZmqForwarderDevice($device);
    }
}