Detailed explanation of timer and event-driven implementation of swoole development functions

Detailed explanation of the timer and event-driven implementation of Swoole development functions

1. Introduction

With the rapid development of the Internet, there are more and more demands for high-concurrency and high-performance applications. The traditional PHP development method will face some bottlenecks when handling a large number of concurrent requests. As a PHP extension library, Swoole makes up for PHP's shortcomings in high performance and high concurrency. It provides a more efficient development method by introducing coroutines and event-driven mechanisms to achieve non-blocking asynchronous IO operations.

This article will introduce the implementation of timer and event-driven in Swoole, and provide code examples to help readers better understand and use Swoole to develop high-performance applications.

2. How to implement the timer

In Swoole, we can use timers to perform some periodic tasks, such as regularly cleaning the cache, regularly pushing messages, etc. Swoole provides two functions, swoole_timer_tick and swoole_timer_after, to implement timer operations.

1. swoole_timer_tick
   The swoole_timer_tick function is used to set a periodic timer. The specified callback function will be executed regularly within the specified interval.

The following is a sample code:

// 监听一个定时器，每隔1秒执行一次
$swooleTimer = swoole_timer_tick(1000, function () {
    echo "定时器执行
";
});

// 清除定时器
swoole_timer_clear($swooleTimer);

2. swoole_timer_after
   The swoole_timer_after function is used to set a delay timer and execute the specified callback function after the specified time.

The following is a sample code:

// 延迟5秒执行
swoole_timer_after(5000, function () {
    echo "5秒后执行
";
});

3. Event-driven implementation

In Swoole, event-driven is one of the important means to achieve high performance . Swoole provides a series of event listening functions that can monitor and process various events, such as network request events, timer events, etc.

The following are some commonly used event listening functions and sample codes:

1. onWorkerStart
   The onWorkerStart event is triggered when the Worker process starts, and is usually used to initialize some resources or load some Global configuration, etc.

$serv = new SwooleServer($host, $port, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);

$serv->on('WorkerStart', function ($serv, $workerId) {
    // 初始化数据库连接
    $mysql = new SwooleCoroutineMySQL();
    $mysql->connect([
        'host' => '127.0.0.1',
        'port' => 3306,
        'user' => 'root',
        'password' => '123456',
        'database' => 'test',
    ]);
    $serv->mysql = $mysql;
});

2. onReceive
   The onReceive event is triggered when the data sent by the client is received. The request can be processed here and the response can be returned.

$serv->on('Receive', function ($serv, $fd, $reactorId, $data) {
    $serv->send($fd, "Hello, Swoole!");
});

3. onTimer
   The onTimer event will be called when the timer fires, and some scheduled tasks can be performed here.

$serv->on('Timer', function ($serv, $interval) {
    echo "定时任务执行
";
});
// 启动一个定时器，每隔1秒触发一次
$serv->addtimer(1000);

4. Summary

Through the introduction of this article, we have learned about the implementation of timer and event drive in Swoole, as well as the corresponding code examples. Timer and event-driven mechanisms are one of the important means for Swoole to achieve high performance and high concurrency. They can help us better perform asynchronous IO operations and periodic task management.

In actual development, timers and event-driven mechanisms can be selected for development according to different needs to improve application performance and concurrency capabilities. I hope this article can inspire readers and play a positive role in Swoole development.

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