ConnectionManagerHack.txt

<?hh
class ConnectionManager {
    protected Vector<AsyncMysqlConnection> $freeConnections = Vector {};
    public function getFreeConnection():AsyncMysqlConnection {
        try {
            return $this->freeConnections->pop();
        } catch (Exception $e) {
            //Create new Connection
            throw $e;
        }
    }
    public function free(AsyncMysqlConnection $connection) {
        $this->freeConnections->add($connection);
    }
}
class Connection {
    protected ?AsyncMysqlConnection $connection;
    public function __construct(protected ConnectionManager $manager) {

    }

    public function queryf($query):Awaitable<AsyncMysqlResult> {
        $this->connection = $this->manager->getFreeConnection();
        return $this->manager->getFreeConnection()->queryf($query);
    }

    public function close():void {
        if ($this->connection) {
            $this->manager->free($this->connection);
        }
    }
}
class ConnectionPool {
    protected ConnectionManager $manager;
    public function __construct() {
        $this->manager = new ConnectionManager();
    }
    public function getConnection():Connection {
        return new Connection($this->manager);
    }
}

$pool = new ConnectionPool();
for ($i = 0; $i < 100; $i++) {
    $pool->getConnection();
}