PHP および MySQL における遅延タスク処理とフロー制御におけるキュー テクノロジーの応用

class Queue { private $queue; public function __construct() { $this->queue = array(); } public function enqueue($item) { array_push($this->queue, $item); } public function dequeue() { return array_shift($this->queue); } public function isEmpty() { return empty($this->queue); } }

CREATE TABLE queue ( id INT(11) AUTO_INCREMENT PRIMARY KEY, data TEXT NOT NULL, created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP );

class Queue { private $db; public function __construct() { $this->db = new PDO('mysql:host=localhost;dbname=your_db_name', 'your_username', 'your_password'); } public function enqueue($item) { $stmt = $this->db->prepare("INSERT INTO queue (data) VALUES (:data)"); $stmt->bindValue(':data', $item); $stmt->execute(); } public function dequeue() { $stmt = $this->db->query("SELECT * FROM queue ORDER BY created_at ASC LIMIT 1"); $item = $stmt->fetch(PDO::FETCH_ASSOC); if ($item) { $this->db->exec("DELETE FROM queue WHERE id = {$item['id']}"); return $item['data']; } return null; } }

class TrafficControl { private $queue; private $maxConcurrentTasks; public function __construct($maxConcurrentTasks) { $this->queue = new Queue(); $this->maxConcurrentTasks = $maxConcurrentTasks; } public function addTask($task) { if (count($this->queue) >= $this->maxConcurrentTasks) { echo "Too many tasks, please try again later."; return; } $this->queue->enqueue($task); } public function processTasks() { while (!$this->queue->isEmpty()) { $task = $this->queue->dequeue(); // 处理任务... } } } // 创建TrafficControl实例并添加任务 $trafficControl = new TrafficControl(5); $trafficControl->addTask('task1'); $trafficControl->addTask('task2'); // 处理任务 $trafficControl->processTasks();