Parlons de la façon dont PHP permet au pool de processus Swoole/Pool d'implémenter des connexions persistantes Redis

<?php

use Swoole\Process;
use Swoole\Coroutine;

// 指定5个工作进程
$pool = new Process\Pool(5);
// 设置启用协程
$pool->set([&#39;enable_coroutine&#39; => true]);

/**
* onWorkerStart 子进程启动
* @param \Swoole\Process\Pool $pool Pool对象
* @param int $workerId   WorkerId当前工作进程的编号，底层会对子进程进行标号
**/
$pool->on("WorkerStart", function (Process\Pool $pool, $workerId) {
// 输出当前工作进程
   echo "Worker #{$workerId} is started\n";

   // 实例化化连接redis
   $redis = new Redis();
   $redis->pconnect(&#39;127.0.0.1&#39;, 6379);
   // 指定redis键
   $key = "key1";

   // 循环读取列表数据
   while (true) {
    // 弹出列表最后一个元素
       $msgs = $redis->brpop($key, 2);
       // 元素值为空则跳过
       if ( $msgs == null) {
           continue;
       }
       // 打印获取的值
       var_dump($msgs);
       echo "Processed by Worker#{$workerId}\n";
   }
});

// 子进程结束
$pool->on("WorkerStop", function ($pool, $workerId) {
   echo "Worker#{$workerId} is stopped\n";
});

// 启动工作进程
$pool->start();

# 通过redis客户端连接
./redis-cli

127.0.0.1:6379> lpush key1 'world'

php d10.php

ps aux | grep php
root        938  0.0  1.2 129164 12412 ?        Ss   Apr21   0:00 php-fpm: master process (/usr/local/php-8.0.1/etc/php-fpm.conf)
www         951  0.0  0.6 129164  6636 ?        S    Apr21   0:00 php-fpm: pool www
www         952  0.0  0.6 129164  6640 ?        S    Apr21   0:00 php-fpm: pool www
root      12327  0.0  1.2 126992 12800 pts/2    S+   00:02   0:00 php d10.php
root      12328  0.0  0.7 131096  7444 pts/2    S+   00:02   0:00 php d10.php
root      12329  0.0  0.7 131096  7448 pts/2    S+   00:02   0:00 php d10.php
root      12330  0.0  0.7 131096  7448 pts/2    S+   00:02   0:00 php d10.php
root      12331  0.0  0.7 131096  7448 pts/2    S+   00:02   0:00 php d10.php
root      12332  0.0  0.7 131096  7448 pts/2    S+   00:02   0:00 php d10.php
root      12355  0.0  0.0 112812   976 pts/3    R+   00:09   0:00 grep --color=auto php

php d10.php

Worker #1 is started
Worker #2 is started
Worker #3 is started
Worker #4 is started
Worker #0 is started
array(2) {
 [0]=>
 string(4) "key1"
 [1]=>
 string(5) "world"
}
Processed by Worker#1