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<?php |
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declare(strict_types=1); |
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namespace unreal4u\MQTT\DataTypes; |
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use unreal4u\MQTT\Exceptions\InvalidQoSLevel; |
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use unreal4u\MQTT\Exceptions\MessageTooBig; |
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final class Message |
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{ |
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/** |
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* This field indicates the level of assurance for delivery of an Application Message. Can be 0, 1 or 2 |
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* |
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* 0: At most once delivery (default) |
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* 1: At least once delivery |
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* 2: Exactly once delivery |
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* |
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* @var QoSLevel |
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*/ |
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private $qosLevel; |
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/** |
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* @var string |
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*/ |
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private $payload; |
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/** |
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* If the RETAIN flag is set to 1, in a PUBLISH Packet sent by a Client to a Server, the Server MUST store the |
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* Application Message and its QoS, so that it can be delivered to future subscribers whose subscriptions match its |
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* topic name |
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* @var bool |
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*/ |
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private $isRetained = false; |
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/** |
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* The TopicName identifies the information channel to which payload data is published |
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* @var TopicName |
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*/ |
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private $topic; |
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/** |
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* Message constructor. |
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* @param string $payload |
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* @param TopicName $topic |
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* @throws MessageTooBig |
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*/ |
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public function __construct(string $payload, TopicName $topic) |
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{ |
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$this->topic = $topic; |
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if (mb_strlen($payload) > 65535) { |
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throw new MessageTooBig('Message payload can not exceed 65535 characters!'); |
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} |
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$this->payload = $payload; |
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} |
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/** |
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* Sets the QoS level to the indicated value. Must be 0, 1 or 2. |
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* |
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* @param QoSLevel $level |
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* @return Message |
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*/ |
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public function setQoSLevel(QoSLevel $level): Message |
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{ |
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$this->qosLevel = $level; |
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return $this; |
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} |
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/** |
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* Sets the retain flag to the given value |
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* |
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* @param bool $flag Set to true if message should be retained, false otherwise (default) |
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* @return Message |
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*/ |
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public function setRetainFlag(bool $flag): Message |
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{ |
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$this->isRetained = $flag; |
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return $this; |
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} |
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public function getPayload(): string |
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{ |
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return $this->payload; |
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} |
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/** |
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* Gets the topic name |
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* |
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* @return string |
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*/ |
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public function getTopicName(): string |
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{ |
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return $this->topic->getTopicName(); |
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} |
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/** |
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* Gets the current QoS level |
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* |
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* @return int |
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* @throws InvalidQoSLevel |
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*/ |
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public function getQoSLevel(): int |
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{ |
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if ($this->qosLevel === null) { |
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// QoSLevel defaults at 0 |
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$this->qosLevel = new QoSLevel(0); |
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} |
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return $this->qosLevel->getQoSLevel(); |
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} |
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/** |
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* Gets the set retain flag |
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* |
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* @return bool |
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*/ |
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public function isRetained(): bool |
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{ |
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return $this->isRetained; |
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} |
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} |
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unreal4u /
mqtt
