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vendor/binsoul/net-mqtt/src/Flow/OutgoingUnsubscribeFlow.php

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+<?php
+
+namespace BinSoul\Net\Mqtt\Flow;
+
+use BinSoul\Net\Mqtt\IdentifierGenerator;
+use BinSoul\Net\Mqtt\Packet;
+use BinSoul\Net\Mqtt\Packet\UnsubscribeRequestPacket;
+use BinSoul\Net\Mqtt\Packet\UnsubscribeResponsePacket;
+use BinSoul\Net\Mqtt\Subscription;
+
+/**
+ * Represents a flow starting with an outgoing UNSUBSCRIBE packet.
+ */
+class OutgoingUnsubscribeFlow extends AbstractFlow
+{
+    /** @var int */
+    private $identifier;
+    /** @var Subscription[] */
+    private $subscriptions;
+
+    /**
+     * Constructs an instance of this class.
+     *
+     * @param Subscription[]      $subscriptions
+     * @param IdentifierGenerator $generator
+     */
+    public function __construct(array $subscriptions, IdentifierGenerator $generator)
+    {
+        $this->subscriptions = array_values($subscriptions);
+        $this->identifier = $generator->generatePacketID();
+    }
+
+    public function getCode()
+    {
+        return 'unsubscribe';
+    }
+
+    public function start()
+    {
+        $packet = new UnsubscribeRequestPacket();
+        $packet->setTopic($this->subscriptions[0]->getFilter());
+        $packet->setIdentifier($this->identifier);
+
+        return $packet;
+    }
+
+    public function accept(Packet $packet)
+    {
+        if ($packet->getPacketType() !== Packet::TYPE_UNSUBACK) {
+            return false;
+        }
+
+        /* @var UnsubscribeResponsePacket $packet */
+        return $packet->getIdentifier() === $this->identifier;
+    }
+
+    public function next(Packet $packet)
+    {
+        $this->succeed($this->subscriptions[0]);
+    }
+}