<?php
/**
* This file is part of workerman.
*
* Licensed under The MIT License
* For full copyright and license information, please see the MIT-LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @author walkor<walkor@workerman.net>
* @copyright walkor<walkor@workerman.net>
* @link http://www.workerman.net/
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Workerman\Events;
/**
* select eventloop
*/
class Select implements EventInterface
{
/**
* 所有读写事件侦听器
*
* @var array
*/
public $_allEvents = array();
/**
* 信号事件侦听器
*
* @var array
*/
public $_signalEvents = array();
/**
* Fds等待阅读事件
*
* @var array
*/
protected $_readFds = array();
/**
* Fds等待写事件
*
* @var array
*/
protected $_writeFds = array();
/**
* Fds等待事件除外
*
* @var array
*/
protected $_exceptFds = array();
/**
* 定时器调度程序
* {['data':timer_id, 'priority':run_timestamp], ..}
*
* @var \SplPriorityQueue
*/
protected $_scheduler = null;
/**
* 所有计时器事件侦听器
* [[func, args, flag, timer_interval], ..]
*
* @var array
*/
protected $_eventTimer = array();
/**
* 定时器id.
*
* @var int
*/
protected $_timerId = 1;
/**
* Select超时.
*
* @var int
*/
protected $_selectTimeout = 100000000;
/**
* 双信道
*
* @var array
*/
protected $channel = array();
/**
* 构造方法
*/
public function __construct()
{
// 创建一个管道并放入读取集合中以读取描述符以避免空轮询
$this->channel = stream_socket_pair(DIRECTORY_SEPARATOR === '/' ? STREAM_PF_UNIX : STREAM_PF_INET,
STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
if($this->channel) {
stream_set_blocking($this->channel[0], 0);
$this->_readFds[0] = $this->channel[0];
}
// Init SplPriorityQueue.
$this->_scheduler = new \SplPriorityQueue();
$this->_scheduler->setExtractFlags(\SplPriorityQueue::EXTR_BOTH);
}
/**
* 添加定时器
*/
public function add($fd, $flag, $func, $args = array())
{
switch ($flag) {
case self::EV_READ:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_readFds[$fd_key] = $fd;
break;
case self::EV_WRITE:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_writeFds[$fd_key] = $fd;
break;
case self::EV_EXCEPT:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_exceptFds[$fd_key] = $fd;
break;
case self::EV_SIGNAL:
// Windows not support signal.
if(DIRECTORY_SEPARATOR !== '/') {
return false;
}
$fd_key = (int)$fd;
$this->_signalEvents[$fd_key][$flag] = array($func, $fd);
pcntl_signal($fd, array($this, 'signalHandler'));
break;
case self::EV_TIMER:
case self::EV_TIMER_ONCE:
$timer_id = $this->_timerId++;
$run_time = microtime(true) + $fd;
$this->_scheduler->insert($timer_id, -$run_time);
$this->_eventTimer[$timer_id] = array($func, (array)$args, $flag, $fd);
$select_timeout = ($run_time - microtime(true)) * 1000000;
if( $this->_selectTimeout > $select_timeout ){
$this->_selectTimeout = $select_timeout;
}
return $timer_id;
}
return true;
}
/**
* 信号处理器
*
* @param int $signal
*/
public function signalHandler($signal)
{
call_user_func_array($this->_signalEvents[$signal][self::EV_SIGNAL][0], array($signal));
}
/**
* 删除定时器
*/
public function del($fd, $flag)
{
$fd_key = (int)$fd;
switch ($flag) {
case self::EV_READ:
unset($this->_allEvents[$fd_key][$flag], $this->_readFds[$fd_key]);
if (empty($this->_allEvents[$fd_key])) {
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_WRITE:
unset($this->_allEvents[$fd_key][$flag], $this->_writeFds[$fd_key]);
if (empty($this->_allEvents[$fd_key])) {
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_EXCEPT:
unset($this->_allEvents[$fd_key][$flag], $this->_exceptFds[$fd_key]);
if(empty($this->_allEvents[$fd_key]))
{
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_SIGNAL:
if(DIRECTORY_SEPARATOR !== '/') {
return false;
}
unset($this->_signalEvents[$fd_key]);
pcntl_signal($fd, SIG_IGN);
break;
case self::EV_TIMER:
case self::EV_TIMER_ONCE;
unset($this->_eventTimer[$fd_key]);
return true;
}
return false;
}
/**
* Tick for timer.
*
* @return void
*/
protected function tick()
{
while (!$this->_scheduler->isEmpty()) {
$scheduler_data = $this->_scheduler->top();
$timer_id = $scheduler_data['data'];
$next_run_time = -$scheduler_data['priority'];
$time_now = microtime(true);
$this->_selectTimeout = ($next_run_time - $time_now) * 1000000;
if ($this->_selectTimeout <= 0) {
$this->_scheduler->extract();
if (!isset($this->_eventTimer[$timer_id])) {
continue;
}
// [func, args, flag, timer_interval]
$task_data = $this->_eventTimer[$timer_id];
if ($task_data[2] === self::EV_TIMER) {
$next_run_time = $time_now + $task_data[3];
$this->_scheduler->insert($timer_id, -$next_run_time);
}
call_user_func_array($task_data[0], $task_data[1]);
if (isset($this->_eventTimer[$timer_id]) && $task_data[2] === self::EV_TIMER_ONCE) {
$this->del($timer_id, self::EV_TIMER_ONCE);
}
continue;
}
return;
}
$this->_selectTimeout = 100000000;
}
/**
* 删除所有定时器
*/
public function clearAllTimer()
{
$this->_scheduler = new \SplPriorityQueue();
$this->_scheduler->setExtractFlags(\SplPriorityQueue::EXTR_BOTH);
$this->_eventTimer = array();
}
/**
* 循环
*/
public function loop()
{
$e = null;
while (1) {
if(DIRECTORY_SEPARATOR === '/') {
// Calls signal handlers for pending signals
pcntl_signal_dispatch();
}
$read = $this->_readFds;
$write = $this->_writeFds;
$except = $this->_exceptFds;
// Waiting read/write/signal/timeout events.
set_error_handler(function(){});
$ret = stream_select($read, $write, $except, 0, $this->_selectTimeout);
restore_error_handler();
if (!$this->_scheduler->isEmpty()) {
$this->tick();
}
if (!$ret) {
continue;
}
if ($read) {
foreach ($read as $fd) {
$fd_key = (int)$fd;
if (isset($this->_allEvents[$fd_key][self::EV_READ])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_READ][0],
array($this->_allEvents[$fd_key][self::EV_READ][1]));
}
}
}
if ($write) {
foreach ($write as $fd) {
$fd_key = (int)$fd;
if (isset($this->_allEvents[$fd_key][self::EV_WRITE])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_WRITE][0],
array($this->_allEvents[$fd_key][self::EV_WRITE][1]));
}
}
}
if($except) {
foreach($except as $fd) {
$fd_key = (int) $fd;
if(isset($this->_allEvents[$fd_key][self::EV_EXCEPT])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_EXCEPT][0],
array($this->_allEvents[$fd_key][self::EV_EXCEPT][1]));
}
}
}
}
}
/**
* 销毁循环
*
* @return void
*/
public function destroy()
{
}
/**
* 获取定时器数目
*
* @return integer
*/
public function getTimerCount()
{
return count($this->_eventTimer);
}
}
