How to implement multiple TCP connection reuse in Swoole

Swoole is a high-performance network communication framework that allows PHP applications to quickly create high-concurrency, multi-connection TCP servers and clients. In actual applications, we often need to handle multiple TCP connections. In this case, the performance and efficiency of the system can be improved by reusing connections. This article will introduce how to reuse multiple TCP connections in Swoole.

1. The concept of TCP connection reuse

In a traditional TCP connection, a new connection needs to be established for each communication. But in some cases, we need to communicate frequently, and the overhead of establishing connections will affect the performance of the system. In order to solve this problem, we can avoid the process of establishing connections multiple times and improve system performance and efficiency by reusing already established connections.

2. Swoole's multiple TCP connection reuse implementation

In Swoole, we can realize connection reuse through TCP connection pool. TCP connection pool is a tool for managing TCP connections, which can improve the reuse rate and efficiency of connections.

2.1 Create a connection pool

In Swoole, you can create a connection pool through the swoole_connpool_create() function. The parameters of this function include the type of connection pool (SW_CONNPOOL_TCP represents TCP connection pool), the maximum number of connections supported by the connection pool, the maximum idle time of the connection pool, etc.

$pool = swoole_connpool_create(
    SW_CONNPOOL_TCP, // 连接池类型
    $max_conn = 10, // 最大连接数
    $timeout = 10, // 连接超时时间
    $interval = 1000, // 每个连接的最大空闲时间
);

2.2 Add a connection to the connection pool

When you need to establish a new TCP connection, you can obtain an available connection from the connection pool through the swoole_connpool_get_connection() function. If there is no available connection in the connection pool, this function automatically creates a new connection. When getting a connection, you can set whether you need to keep the connection long. If you need to maintain a long connection, you can set keep_alive to true.

$config = [
    'host' => '127.0.0.1',
    'port' => 9501,
];
$conn = swoole_connpool_get_connection($pool, $config, $keep_alive = true);

2.3 Use connection to communicate

After obtaining the connection, you can send data like a normal TCP connection. When the communication is completed, the connection can be returned to the connection pool through the swoole_connpool_release() function.

// 发送数据
$conn->send("hello");

// 接收数据
$data = $conn->recv();

// 归还连接
swoole_connpool_release($conn);

2.4 Management of connection pool

The connection pool needs to regularly check whether the connection is available and whether the idle time of the connection has timed out. The connection pool can be managed in a timer by calling the swoole_connpool_check() function.

// 每500毫秒检查一次连接池
swoole_timer_tick(500, function () use ($pool) {
    swoole_connpool_check($pool);
});

3. Summary

Through the connection pool, we can reuse multiple TCP connections in Swoole and improve the performance and efficiency of the system. In actual applications, you need to pay attention to the parameter settings of the connection pool and the validity check of the connection to ensure the normal operation of the connection pool. At the same time, you also need to pay attention to the thread safety issues of the connection pool to avoid problems caused by multi-thread competition.

The above is the detailed content of How to implement multiple TCP connection reuse in Swoole. For more information, please follow other related articles on the PHP Chinese website!