基于System V Message queue的PHP消息队列封装

原创文章，转载请注明出处： http://www.huyanping.cn/?p=235
作者： Jenner

System V Message queue 是一种进程通信（IPC）的方式，方便实现生产者-消费者模型，单个或多个生产者向队列中写入消息，多个生产者再从队列中获取消息进行处理。

项目地址：https://github.com/huyanping/Zebra-PHP-Framework

该Wrapper支持：

1. 进程通信
2. 设置最大队列容量（字节单位）
3. 获取当前队列数量
4. 修改队列部分属性

注意：如果要修改队列最大容量，请确保你的脚本是运行在root下

msg_type = $msg_type;        $this->serialize_needed = $serialize_needed;        $this->block_send = $block_send;        $this->option_receive = $option_receive;        $this->maxsize = $maxsize;        $this->init_queue($ipc_filename, $msg_type);    }    /**     * 初始化一个队列     * @param $ipc_filename     * @param $msg_type     * @throws Exception     */    public function init_queue($ipc_filename, $msg_type)    {        $this->key_t = $this->get_ipc_key($ipc_filename, $msg_type);        $this->queue = msg_get_queue($this->key_t);        if (!$this->queue) throw new Exception('msg_get_queue failed');    }    /**     * @param $ipc_filename     * @param $msg_type     * @return int     * @throws Exception     */    public function get_ipc_key($ipc_filename, $msg_type)    {        $key_t = ftok($ipc_filename, $msg_type);        if ($key_t == 0) throw new Exception('ftok error');        return $key_t;    }    /**     * 从队列获取一个     * @return bool     * @throws Exception     */    public function get()    {        $queue_status = $this->status();        if ($queue_status['msg_qnum'] > 0) {            if (msg_receive($this->queue, $this->msg_type, $msgtype_erhalten, $this->maxsize, $data, $this->serialize_needed, $this->option_receive, $err) === true) {                return $data;            } else {                throw new Exception($err);            }        } else {            return false;        }    }    /**     * 写入队列     * @param $message     * @throws Exception     */    public function put($message)    {        if (!msg_send($this->queue, $this->msg_type, $message, $this->serialize_needed, $this->block_send, $err) === true) {            throw new Exception($err);        }        return true;    }    /*     * 返回值数组下标如下：     * msg_perm.uid	 The uid of the owner of the queue. 用户ID     * msg_perm.gid	 The gid of the owner of the queue. 用户组ID     * msg_perm.mode	 The file access mode of the queue. 访问模式     * msg_stime	 The time that the last message was sent to the queue. 最后一次队列写入时间     * msg_rtime	 The time that the last message was received from the queue.  最后一次队列接收时间     * msg_ctime	 The time that the queue was last changed. 最后一次修改时间     * msg_qnum	 The number of messages waiting to be read from the queue. 当前等待被读取的队列数量     * msg_qbytes	 The maximum number of bytes allowed in one message queue.  一个消息队列中允许接收的最大消息总大小     *               On Linux, this value may be read and modified via /proc/sys/kernel/msgmnb.     * msg_lspid	 The pid of the process that sent the last message to the queue. 最后发送消息的进程ID     * msg_lrpid	 The pid of the process that received the last message from the queue. 最后接收消息的进程ID     *     * @return array     */    public function status()    {        $queue_status = msg_stat_queue($this->queue);        return $queue_status;    }    /**     * 获取队列当前堆积状态     * @return mixed     */    public function size()    {        $status = $this->status();        return $status['msg_qnum'];    }    /**     * allows you to change the values of the msg_perm.uid,     * msg_perm.gid, msg_perm.mode and msg_qbytes fields of the underlying message queue data structure     * 可以用来修改队列运行接收的最大读取的数据     *     * @param $key 状态下标     * @param $value 状态值     * @return bool     */    public function set_status($key, $value)    {        $this->check_set_privilege($key);        if ($key == 'msg_qbytes')            return $this->set_max_queue_size($value);        $queue_status[$key] = $value;        return msg_set_queue($this->queue, $queue_status);    }    /**     * 删除一个队列     * @return bool     */    public function queue_remove()    {        return msg_remove_queue($this->queue);    }    //修改队列能容纳的最大字节数，需要root权限    /**     * @param $size     * @return bool     * @throws Exception     */    public function set_max_queue_size($size)    {        $user = get_current_user();        if ($user !== 'root')            throw new Exception('changing msg_qbytes needs root privileges');        return $this->set_status('msg_qbytes', $size);    }    /**     * 判断一个队列是否存在     * @param $key     * @return bool     */    public function queue_exists($key)    {        return msg_queue_exists($key);    }    /**     * 检查修改队列状态的权限     * @param $key     * @throws Exception     */    private function check_set_privilege($key)    {        $privilege_field = array('msg_perm.uid', 'msg_perm.gid', 'msg_perm.mode');        if (!in_array($key, $privilege_field)) {            throw new Exception('you can only change msg_perm.uid, msg_perm.gid, msg_perm.mode and msg_qbytes. And msg_qbytes needs root privileges');        }    }} 

调用方式如下：

写入队列：

put(mt_rand(0, 1000)));        echo $messageQueue->size() . PHP_EOL;        sleep(1);    }}catch(Exception $e){    echo $e->getMessage();}

get());        sleep(1);    }}catch(Exception $e){    echo $e->getMessage();}

queue_remove());}catch(Exception $e){    echo $e->getMessage();}