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<?php |
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/* |
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* This file is part of the Tidal/WampWatch package. |
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* (c) 2016 Timo Michna <timomichna/yahoo.de> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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*/ |
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namespace Tidal\WampWatch\Subscription; |
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use Thruway\Message\SubscribedMessage; |
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use React\Promise\Deferred; |
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use React\Promise\Promise; |
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use Tidal\WampWatch\ClientSessionInterface as ClientSession; |
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use Tidal\WampWatch\Util; |
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class Collection |
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{ |
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/** |
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* The collection's WAMP client session. |
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* |
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* @var ClientSession |
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*/ |
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private $session; |
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/** |
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* @var array list of subscriptions with topic as key and subscription-id as value |
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*/ |
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private $subscriptions = []; |
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/** |
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* @var array list of subscriptions callbacks with topic as key |
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*/ |
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private $subscriptionCallbacks = []; |
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/** |
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* @var bool if the collection is successfully subscribed to all topics |
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*/ |
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private $isSubscribed = false; |
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/** |
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* @var bool if the collection is currently trying to subscribe to all topics |
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*/ |
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private $isSubscribing = false; |
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/** |
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* @var Deferred |
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*/ |
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private $subscriptionPromise; |
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/** |
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* Collection constructor. |
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* |
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* @param \Tidal\WampWatch\ClientSessionInterface $session |
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*/ |
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public function __construct(ClientSession $session) |
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{ |
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$this->session = $session; |
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} |
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/** |
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* @param string $topic the topic the subscription is for |
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* @param callable $callback the callback for the topic |
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*/ |
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public function addSubscription($topic, callable $callback) |
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{ |
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$this->subscriptions[$topic] = 0; |
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$this->subscriptionCallbacks[$topic] = $callback; |
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} |
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/** |
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* @return bool |
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*/ |
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public function hasSubscription() |
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{ |
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return count($this->subscriptions) > 0; |
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} |
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/** |
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* Subscribe to all topics added with 'addSubscription'. |
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* Returns false if already subscribed or curretly subscribing. |
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* |
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* @return \React\Promise\Promise |
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*/ |
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public function subscribe() |
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{ |
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if (!$this->isSubscribed() && !$this->isSubscribing()) { |
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$this->isSubscribing = true; |
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$this->subscriptionPromise = new Deferred(); |
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$this->doSubscribe(); |
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} |
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return $this->subscriptionPromise->promise(); |
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} |
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/** |
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* |
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*/ |
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protected function doSubscribe() |
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{ |
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foreach (array_keys($this->subscriptions) as $topic) { |
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$this->session->subscribe($topic, $this->subscriptionCallbacks[$topic]) |
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->done(function (SubscribedMessage $msg) use ($topic) { |
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$this->subscriptions[$topic] = $msg->getSubscriptionId(); |
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$this->subscriptionPromise->notify($topic); |
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$this->checkSubscribed(); |
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}); |
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} |
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} |
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/** |
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* @return \React\Promise\Promise|\React\Promise\PromiseInterface |
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*/ |
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public function unsubscribe() |
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{ |
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$resolver = function (callable $resolve) { |
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$resolve(); |
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}; |
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$promise = new Promise($resolver); |
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if ($this->isSubscribed()) { |
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foreach ($this->subscriptions as $topic => $subId) { |
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Util::unsubscribe($this->session, $subId); |
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} |
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$this->isSubscribed = false; |
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} |
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return $promise; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isSubscribed() |
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{ |
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return $this->isSubscribed; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isSubscribing() |
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{ |
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return $this->isSubscribing; |
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} |
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/** |
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* Check if all subscriptions have been successfully confirmed. |
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*/ |
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protected function checkSubscribed() |
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{ |
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foreach ($this->subscriptions as $topic => $subId) { |
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if ($subId === 0) { |
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return false; |
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} |
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} |
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$this->isSubscribed = true; |
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$this->isSubscribing = false; |
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$this->subscriptionPromise->resolve($this->subscriptions); |
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return true; |
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} |
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} |
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tidal /
WampWatch
