Application scenarios of message priority and persistent storage of queue technology in PHP and MySQL

Application scenarios of message priority and persistent storage of queue technology in PHP and MySQL

With the rapid development of the Internet and the continuous growth of users, developers We often need to handle a large number of concurrent requests and data so that the system can process and respond efficiently. As a solution, queue technology is widely used in various application scenarios, especially in PHP and MySQL technology stacks. It is widely used and effective.

Queue is a first-in-first-out (FIFO) data structure that is often used to solve task scheduling and data processing problems in high-concurrency environments. In PHP and MySQL, queue technology can realize priority processing and persistent storage of messages, improving system performance and reliability.

Message priority refers to the importance or urgency of processing messages. By setting different priorities for messages, you can ensure that important messages are processed in a timely manner. In PHP, we can implement message priority by using priority queue. The following is a sample code:

<?php

class PriorityQueue {

    private $queue = [];

    public function enqueue($data, $priority) {
        if (!isset($this->queue[$priority])) {
            $this->queue[$priority] = new SplPriorityQueue();
        }

        $this->queue[$priority]->insert($data, $priority);
    }

    public function dequeue() {
        $queue = $this->queue;
        krsort($queue); // 根据优先级降序排序

        foreach ($queue as $priority => $data) {
            if (!$data->isEmpty()) {
                return $data->extract();
            }
        }

        return null;
    }
}

// 使用示例
$priorityQueue = new PriorityQueue();

$priorityQueue->enqueue("消息1", 1);
$priorityQueue->enqueue("消息2", 2);
$priorityQueue->enqueue("消息3", 1);

echo $priorityQueue->dequeue() . "
";  // 输出：消息2
echo $priorityQueue->dequeue() . "
";  // 输出：消息1
echo $priorityQueue->dequeue() . "
";  // 输出：消息3
?>

Persistent storage refers to storing messages in a persistent medium to ensure that messages can still be processed normally after system restart or failure recovery. In MySQL, we can achieve persistent storage of messages by creating a queue table. The following is a sample code:

<?php

class MessageQueue {

    private $conn;

    public function __construct($host, $user, $password, $database) {
        $this->conn = new mysqli($host, $user, $password, $database);
        if ($this->conn->connect_error) {
            throw new Exception("数据库连接失败：" . $this->conn->connect_error);
        }
    }

    public function enqueue($data) {
        $query = "INSERT INTO message_queue (data, created_at) VALUES (?, NOW())";

        $stmt = $this->conn->prepare($query);
        $stmt->bind_param("s", $data);
        $stmt->execute();
        $stmt->close();
    }

    public function dequeue() {
        $query = "SELECT data FROM message_queue ORDER BY created_at ASC LIMIT 1";

        $result = $this->conn->query($query);
        $data = $result->fetch_assoc()["data"];

        $deleteQuery = "DELETE FROM message_queue ORDER BY created_at ASC LIMIT 1";
        $this->conn->query($deleteQuery);

        return $data;
    }
}

// 使用示例
$messageQueue = new MessageQueue("localhost", "user", "password", "database");

$messageQueue->enqueue("消息1");
$messageQueue->enqueue("消息2");
$messageQueue->enqueue("消息3");

echo $messageQueue->dequeue() . "
";  // 输出：消息1
echo $messageQueue->dequeue() . "
";  // 输出：消息2
echo $messageQueue->dequeue() . "
";  // 输出：消息3
?>

Through the above code example, we can see how to use queue technology in PHP and MySQL to implement priority processing and persistent storage of messages. These application scenarios can help the system improve performance and reliability under conditions of high concurrency and large amounts of data processing. Whether it is processing payment orders, sending emails or generating reports, queue technology can effectively help us solve these problems.

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