PHP秒杀系统中的分布式任务调度和分布式唯一ID生成方法

<?php
// 生产者代码
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$taskData = [
    'task_id' => uniqid(), // 任务ID
    'task_data' => 'some data' // 任务数据
];

$redis->lPush('task_queue', json_encode($taskData));

// 消费者代码
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

while (true) {
    $taskDataJson = $redis->rPop('task_queue');
    if ($taskDataJson) {
        $taskData = json_decode($taskDataJson, true);
        // 执行任务代码
        echo "Task ID: {$taskData['task_id']} 
";
        echo "Task Data: {$taskData['task_data']} 
";
    }
}

<?php
class Snowflake
{
    private $dataCenterId; // 数据中心ID
    private $workerId; // 工作节点ID
    private $sequence = 0; // 序列号

    const EPOCH = 1590000000; // 起始时间戳，2020-05-21 00:00:00

    public function __construct($dataCenterId, $workerId)
    {
        // 检查工作节点ID和数据中心ID是否合法
        if ($dataCenterId > 31 || $dataCenterId < 0) {
            throw new InvalidArgumentException("Data Center ID can't be greater than 31 or less than 0");
        }
        if ($workerId > 31 || $workerId < 0) {
            throw new InvalidArgumentException("Worker ID can't be greater than 31 or less than 0");
        }

        $this->dataCenterId = $dataCenterId;
        $this->workerId = $workerId;
    }

    public function nextId()
    {
        $timestamp = $this->getTimestamp();
        if ($timestamp < self::EPOCH) {
            throw new Exception("Clock moved backwards. Refusing to generate ID");
        }

        if ($timestamp === $this->lastTimestamp) {
            $this->sequence = ($this->sequence + 1) & 4095; // 4095是12位二进制
            if ($this->sequence === 0) {
                $timestamp = $this->tilNextMillis();
            }
        } else {
            $this->sequence = 0;
        }

        $this->lastTimestamp = $timestamp;

        return (($timestamp - self::EPOCH) << 22) | ($this->dataCenterId << 17) | ($this->workerId << 12) | $this->sequence;
    }

    public function tilNextMillis()
    {
        $timestamp = $this->getTimestamp();
        while ($timestamp <= $this->lastTimestamp) {
            $timestamp = $this->getTimestamp();
        }
        return $timestamp;
    }

    public function getTimestamp()
    {
        return floor(microtime(true) * 1000);
    }
}

// 测试代码
$snowflake = new Snowflake(1, 1); // 数据中心ID为1，工作节点ID为1

for ($i = 0; $i < 10; $i++) {
    echo $snowflake->nextId() . PHP_EOL;
}