Application scenarios of Swoole and Workerman's message filtering and listeners in PHP and MySQL

Application scenarios of Swoole and Workerman's message filtering and listeners in PHP and MySQL

In modern Web development, real-time message push has become a basic needs. To meet this need, developers use a variety of technologies and tools. In PHP development, Swoole and Workerman are two very popular frameworks, which provide high-performance network communication capabilities and event-driven programming models. In this article, we will discuss the application scenarios of Swoole and Workerman's message filtering and listeners in PHP and MySQL, and give specific code examples.

1. Application scenarios of message filters

Message filters are an important concept in Swoole and Workerman. It allows developers to filter received messages based on specified criteria and process only messages that meet the criteria. In PHP and MySQL applications, we can use message filters to filter database change messages and only process specific change events.

// 使用Swoole的消息过滤器实现MySQL变更事件监听
$swooleServer = new SwooleServer('0.0.0.0', 9501);

$swooleServer->on('start', function (swoole_server $server) {
    // 在服务器启动时，将MySQL变更事件添加到消息过滤器中
    $server->addTable('mysqlEventFilter', [
        'event' => ['type' => swoole_table::TYPE_STRING, 'size' => 32],
        'data' => ['type' => swoole_table::TYPE_STRING, 'size' => 1024],
    ]);
    // 监听MySQL Binlog变更事件，并将事件信息保存到消息过滤器中
    // 这里我们使用了一个虚拟的示例方法 listenMySQLChangeEvent 来监听并保存变更事件
    // 真实场景中，你需要根据自己的需求编写事件监听方法
    listenMySQLChangeEvent(function ($event, $data) use ($server) {
        $server->table('mysqlEventFilter')->set($event, ['event' => $event, 'data' => $data]);
    });
});

$swooleServer->on('receive', function (swoole_server $server, $fd, $fromId, $data) {
    // 从消息过滤器中获取指定的MySQL变更事件
    $eventFilter = $server->table('mysqlEventFilter');
    $event = $data;
    $eventData = $eventFilter->get($event);
    if ($eventData) {
        // 处理MySQL变更事件
        handleMySQLChangeEvent($eventData['data']);
    }
});

$swooleServer->start();

In the above code example, we created a Swoole Server object and added a message filter named mysqlEventFilter when the server started. Then, we listen to the MySQL change event through the listenMySQLChangeEvent method and save the event information to the mysqlEventFilter filter. Finally, when receiving the message, we obtain the specified MySQL change event through the message filter and execute the corresponding processing logic based on the event.

2. Application scenarios of listeners

In addition to message filters, Swoole and Workerman also provide the important concept of listeners. Listeners allow us to execute callback functions when specific events occur. In PHP and MySQL applications, we can use listeners to listen to database change events and perform related operations.

// 使用Workerman的监听器实现MySQL变更事件监听
$worker = new WorkermanWorker();

$eventListener = function ($event, $data) {
    // 处理MySQL变更事件
    handleMySQLChangeEvent($event, $data);
};

$worker->onWorkerStart = function () use ($eventListener) {
    // 初始化MySQL连接
    initMySQLConnection();

    // 监听MySQL Binlog变更事件，并在事件发生时调用$eventListener
    // 这里我们使用了一个虚拟的示例方法 listenMySQLChangeEvent 来监听变更事件
    // 真实场景中，你需要根据自己的需求编写事件监听方法
    listenMySQLChangeEvent($eventListener);
};

// 运行Worker
WorkermanWorker::runAll();

In the above code example, we created a Workerman Worker object and registered an event callback function $eventListener when the Worker process started. Then, we listen to the MySQL change event through the listenMySQLChangeEvent method, and call $eventListener for processing when the event occurs.

Through the above code examples, we can see the application scenarios of Swoole and Workerman's message filters and listeners in PHP and MySQL. These functions provide us with a convenient and high-performance solution for implementing real-time message push and processing database change events. Of course, actual applications may need to be adjusted and optimized according to specific business needs. I hope this article will be helpful to you when developing PHP and MySQL applications using Swoole and Workerman.

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