$start = microtime(true);
    //set 2s timeout
    service("user")->setTimeout(2);
    $users = (yield service("user")->call("User\User::getUsersCache", ['ids' => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]]));
    dump($users);

    
    $start = microtime(true);
    //set 2s timeout
    $service = (yield service_center("User"));
    $service->setTimeout(2);
    $users = (yield $service->call("User::getUsersCache", ['ids' => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]]));
    dump($users);

    $start = microtime(true);
    //set 2s timeout
    service("user")->setTimeout(2);

    $callId1 = service("user")->addCall("User\User::getUsersCache", ['ids' => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]]);
    $callId2 = service("user")->addCall("User\User::getUser", ['id' => 1]);
    $res = (yield service("user")->multiCall());

    dump($res[$callId1]);
    dump($res[$callId2]);
    dump(microtime(true) - $start);
    

    $start = microtime(true);
    //set 2s timeout
    $service = (yield service_center("User"));
    $service->setTimeout(2);

    $callId1 = $service->addCall("User::getUsersCache", ['ids' => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]]);
    $callId2 = $service->addCall("User::getUser", ['id' => 1]);
    $res = (yield $service->multiCall());

    dump($res[$callId1]);
    dump($res[$callId2]);
    dump(microtime(true) - $start);
    

    
    use AsyncRedis;

    //unable pool
    \AsyncRedis::enablePool(false);
    //enable pool
    \AsyncRedis::enablePool(true);
    //set timeout
    AsyncRedis::setTimeout(2);

    yield AsyncRedis::set('foo', 'bar');
    dump(yield AsyncRedis::get('foo'));
    $user = json_encode(['foo' => 'bar']);
    yield AsyncRedis::hSet('user', 1, $user);
    dump(yield AsyncRedis::hGet('user', 1));
    

    
    use AsyncMysql;
    
    //configure pool num => config/database.php
    AsyncMysql::query($sql, $usePool = true);

    //set timeout
    AsyncMysql::setTimeout(2);

    $res = (yield AsyncMysql::query("INSERT INTO `user` (`id`, `mobile`, `password`) VALUES (NULL, '18768122222', '11111')"));
    //fail return false   
    if ($res) {
        $result = $res->getResult();
        $affectedRows = **Асинхронная транзакция MySQL**

```php
    
    use AsyncMysql;
    
    public function test()
    {
        try {
            yield AsyncMysql::begin();

            $res = (yield $this->doTrans());
            if ($res === false) {
                throw new \Exception("need roll back");
            }

            yield AsyncMysql::commit();
        } catch (\Exception $e) {
            yield AsyncMysql::rollback();
        }
    }

    public function doTrans()
    {
        $res = (yield AsyncMysql::query("INSERT INTO `user` (`id`, `mobile`, `password`) VALUES (NULL, '187681343332', '11111')"));
        if ($res) {
            $result = $res->getResult();
            $affectedRows = $res->getAffectedRows();
            $id = $res->getInsertId();
            $res = (yield AsyncMysql::query("SELECT * FROM `user` WHERE id = {$id}"));
            $res = (yield AsyncMysql::query("SELECT * FROM `user`"));
            $res = (yield AsyncMysql::query("DELETE FROM `user` WHERE id = {$id}", false));
        }

        yield true;
    }

    
    use AsyncLog;

    yield AsyncLog::info('hello world');

    yield AsyncLog::debug('test debug', ['foo' => 'bar']);

    yield AsyncLog::notice('hello world',[], 'group.com');

    yield AsyncLog::warning('hello world');

    yield AsyncLog::error('hello world');

    yield AsyncLog::critical('hello world');

    yield AsyncLog::alert('hello world');

    yield AsyncLog::emergency('hello world');
    

    
    use AsyncFile;

    $content = (yield AsyncFile::read(__ROOT__."runtime/test.txt"));

    $res = (yield AsyncFile::write(__ROOT__."runtime/test.txt", "hello wordls!"));

    $res = (yield AsyncFile::write(__ROOT__."runtime/test.txt", "hello wordls!", FILE_APPEND));

    
    //if not catch，the frame will catchs，return 500 server error response。In dev env, will return trace。
    try {
        throw new \Exception("Error Processing Request", 1); 
        //yield throwException(new \Exception("Error Processing Request", 1));
    } catch (\Exception $e) {
        echo  $e->getMessage();
    }