PHP使用Beanstalkd实例-白红宇

1.使用Composer安装Pheanstalk

composer require pda/pheanstalk

2.实现代码

php查看beanstalkd状态脚本Status.php


    stats());

生产者代码Producter.php


     'testkey'.$i,        'value' => 'testvalue',        'time' => time(),    );    $ret = $pheanstalk->putInTube('test-tube', json_encode($data), Pheanstalk::DEFAULT_PRIORITY, Pheanstalk::DEFAULT_DELAY, Pheanstalk::DEFAULT_TTR);    var_dump($ret);}

消费者代码Consumer.php


    watch('test-tube')        ->ignore('default')        ->reserve();    if ($job){        sleep(2);        echo $job->getData();        echo "\n";        $pheanstalk->delete($job);    }}

打开命令行/终端窗口，执行生产者，会向tube写入50条任务

PS E:\repository\work\beanstalk> php .\Producter.phpint(101)int(102)int(103)int(104)int(105)int(106)int(107)int(108)int(109)int(110)int(111)int(112)int(113)int(114)......

由此可见，$pheanstalk->putInTube成功后返回的是job的id

查看状态

PS E:\repository\work\beanstalk> php Status.phpPheanstalk\Response\ArrayResponse Object(    [_name:Pheanstalk\Response\ArrayResponse:private] => OK    [storage:ArrayObject:private] => Array        (            [current-jobs-urgent] => 0            [current-jobs-ready] => 50            [current-jobs-reserved] => 0            [current-jobs-delayed] => 0            [current-jobs-buried] => 0            ......

结果中显示处于ready待读取状态的job是50个

打开两个或以上命令行/终端窗口，执行消费者，模拟多消费者竞争

消费者1

PS E:\repository\work\beanstalk> php .\Consumer.php{"key":"testkey0","value":"testvalue","time":1548039103}{"key":"testkey1","value":"testvalue","time":1548039103}{"key":"testkey2","value":"testvalue","time":1548039103}{"key":"testkey4","value":"testvalue","time":1548039103}{"key":"testkey6","value":"testvalue","time":1548039103}{"key":"testkey8","value":"testvalue","time":1548039103}{"key":"testkey10","value":"testvalue","time":1548039103}{"key":"testkey12","value":"testvalue","time":1548039103}{"key":"testkey14","value":"testvalue","time":1548039103}{"key":"testkey16","value":"testvalue","time":1548039103}{"key":"testkey18","value":"testvalue","time":1548039103}{"key":"testkey20","value":"testvalue","time":1548039103}{"key":"testkey22","value":"testvalue","time":1548039103}{"key":"testkey24","value":"testvalue","time":1548039103}{"key":"testkey26","value":"testvalue","time":1548039103}{"key":"testkey28","value":"testvalue","time":1548039103}{"key":"testkey30","value":"testvalue","time":1548039103}{"key":"testkey32","value":"testvalue","time":1548039103}{"key":"testkey34","value":"testvalue","time":1548039103}{"key":"testkey36","value":"testvalue","time":1548039103}{"key":"testkey38","value":"testvalue","time":1548039103}{"key":"testkey40","value":"testvalue","time":1548039103}{"key":"testkey42","value":"testvalue","time":1548039103}{"key":"testkey44","value":"testvalue","time":1548039103}{"key":"testkey46","value":"testvalue","time":1548039103}{"key":"testkey48","value":"testvalue","time":1548039103}

消费者2

PS E:\repository\work\beanstalk> php .\Consumer.php{"key":"testkey3","value":"testvalue","time":1548039103}{"key":"testkey5","value":"testvalue","time":1548039103}{"key":"testkey7","value":"testvalue","time":1548039103}{"key":"testkey9","value":"testvalue","time":1548039103}{"key":"testkey11","value":"testvalue","time":1548039103}{"key":"testkey13","value":"testvalue","time":1548039103}{"key":"testkey15","value":"testvalue","time":1548039103}{"key":"testkey17","value":"testvalue","time":1548039103}{"key":"testkey19","value":"testvalue","time":1548039103}{"key":"testkey21","value":"testvalue","time":1548039103}{"key":"testkey23","value":"testvalue","time":1548039103}{"key":"testkey25","value":"testvalue","time":1548039103}{"key":"testkey27","value":"testvalue","time":1548039103}{"key":"testkey29","value":"testvalue","time":1548039103}{"key":"testkey31","value":"testvalue","time":1548039103}{"key":"testkey33","value":"testvalue","time":1548039103}{"key":"testkey35","value":"testvalue","time":1548039103}{"key":"testkey37","value":"testvalue","time":1548039103}{"key":"testkey39","value":"testvalue","time":1548039103}{"key":"testkey41","value":"testvalue","time":1548039103}{"key":"testkey43","value":"testvalue","time":1548039103}{"key":"testkey45","value":"testvalue","time":1548039103}{"key":"testkey47","value":"testvalue","time":1548039103}{"key":"testkey49","value":"testvalue","time":1548039103}

两个消费者竞争着完成了全部任务，由于我的beanstalkd启动时开启了binlog持久，所以beanstalkd重启后任务也不会丢失

3.需要注意的事项

1.创建job时，设置的超时时间Pheanstalk::DEFAULT_TTR一定要比消费者处理一个job的时间要长，否则job在超时之后会被tube更改为ready状态，被其他消费者获取，而此时当前消费者还在处理该job，这就出现了一个job被多个消费者重复执行的可怕现象

2.Pheanstalk的维护者发生了变化，在新版的Pheanstalk中是不支持长连接的，当客户端socket连接服务器时间超过php.ini中设置的default_socket_timeout时，如果未能从服务端tube获得job，连接将会被断开，所以消费者进程需要维护，以便在退出后可以重新开启进程，推荐使用supervisord维护消费者进程。

判断socket超时的代码

public function getLine($length = null)    {        $timeout = ini_get('default_socket_timeout');        $timer   = microtime(true);        do {            $data = isset($length) ?                $this->_wrapper()->fgets($this->_socket, $length) :                $this->_wrapper()->fgets($this->_socket);            if ($this->_wrapper()->feof($this->_socket)) {                throw new Exception\SocketException('Socket closed by server!');            }            if (($data === false) && microtime(true) - $timer > $timeout) {                $this->disconnect();                throw new Exception\SocketException('Socket timed out!');            }        } while ($data === false);        return rtrim($data);    }

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