队列技术在PHP与MySQL中的流量控制和队列监控的应用

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// 将请求加入队列
$redis->lpush('request_queue', 'http://example.com/request1');
$redis->lpush('request_queue', 'http://example.com/request2');

// 从队列中取出请求并进行处理
while ($request = $redis->rpop('request_queue')) {
    // 处理请求的代码
    echo "Processing request: " . $request . "
";
}
?>

-- 创建队列表
CREATE TABLE `queue` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `data` VARCHAR(255) NOT NULL,
    `status` ENUM('new', 'processing', 'completed') NOT NULL DEFAULT 'new',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- 定时任务，每分钟输出队列元素数量和平均处理速度
CREATE EVENT `queue_monitor` ON SCHEDULE EVERY 1 MINUTE DO
BEGIN
    DECLARE queue_length INT;
    DECLARE processing_speed DECIMAL;

    -- 查询队列表中元素数量
    SELECT COUNT(*) INTO queue_length FROM `queue`;

    -- 查询队列表中平均处理速度
    SELECT COUNT(*) / TIMESTAMPDIFF(SECOND, MIN(`created_at`), MAX(`created_at`)) INTO processing_speed
    FROM `queue`
    WHERE `status` = 'completed';

    -- 输出结果
    SELECT CONCAT('Queue length: ', queue_length) AS '队列长度', CONCAT('Processing speed: ', processing_speed) AS '平均处理速度';

    -- 清理已完成的队列元素
    DELETE FROM `queue` WHERE `status` = 'completed';
END;

-- 插入队列元素
INSERT INTO `queue` (`data`) VALUES ('data1'), ('data2'), ('data3'), ('data4');

-- 更新队列元素状态为已处理
UPDATE `queue` SET `status` = 'completed' WHERE `id` = 1;