本文实例讲述了ThinkPHP进程计数类Process用法。分享给大家供大家参考。具体如下：

项目中有一个需求：由于某一后台任务比较占带宽，所以要限制进程数。花了点时间，写了类，目前版本功能比较简单。

Process.class.php文件如下：

<?php
/**
 * Process 
 * 
 * @package 
 * @version $id$
 * @copyright 2005-2011 SUCOP.COM
 * @author Dijia Huang <huangdijia@gmail.com> 
 * @license PHP Version 3.0 {@link http://www.php.net/license/3_0.txt}
 */
class Process
{
  const PROCESS_KEY = '~Process';
  const PROCESS_MAXNUM = 10;
  /**
   * start 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function start(){
    $list = self::__getList();
    $name = self::__getName();
    if(!isset($list[$name])){
      $list[$name] = array('count'=>1, 'lasttime'=>time());
    }else{
      if((time()-$list[$name]['time']) > 600){
        $list[$name]['count'] = 1;
      }else{
        $list[$name]['count'] += 1;
      }
    }
    self::__setList($list);
  }
  /**
   * destory 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function destory(){
    $list = self::__getList();
    $name = self::__getName();
    if(isset($list[$name])){
      if($list[$name]['count'] <= 1){
        unset($list[$name]);
      }else{
        $list[$name]['count'] -= 1;
        $list[$name]['lasttime'] = time();
      }
      self::__setList($list);
    }
  }
  /**
   * getCount 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function getCount(){
    $list = self::__getList();
    $name = self::__getName();
    return $list[$name]['count'];
  }
  /**
   * getMaxnum 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function getMaxnum(){
    $name = self::__getName();
    return C($name) ? C($name) : self::PROCESS_MAXNUM;
  }
  /**
   * getName 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function getName(){
    return self::__getName();
  }
  /**
   * isOvertop 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function isOvertop(){
    return (self::getCount() > self::getMaxnum());
  }
  /**
   * getLasttime 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function getLasttime(){
    $list = self::__getList();
    $name = self::__getName();
    return $list[$name]['lasttime'];
  }
  /**
   * clear 
   * 
   * @static
   * @access public
   * @return void
   */
  static public function clear(){
    F(self::PROCESS_KEY, null);
  }
  /**
   * __setList 
   * 
   * @param mixed $list 
   * @static
   * @access private
   * @return void
   */
  static private function __setList($list=null){
    if(!is_array($list) || empty($list))
      F(self::PROCESS_KEY, null);
    else
      F(self::PROCESS_KEY, $list);
  }
  /**
   * __getList 
   * 
   * @static
   * @access private
   * @return void
   */
  static private function __getList(){
    $list = F(self::PROCESS_KEY);
    if(!is_array($list)) return array();
    else return $list;
  }
  /**
   * __getName 
   * 
   * @static
   * @access private
   * @return void
   */
  static private function __getName(){
    return (defined('GROUP_NAME') ? GROUP_NAME.'_' : '') . MODULE_NAME . '_' . ACTION_NAME;
  }
}
?>

调用方法：

<?php
class IndexAction extends Action 
{
  // 初始化模块
  public function _initialize(){
    parent::_initialize();
    import('@.Util.Process');
    Process::start();
  }
  function __destruct(){
    Process :: destory();
  } 
  public function index(){
    C('Index_index', 3); // 动态更改限制数, 默认为10
    if(Process::isOvertop()) echo "超出限制";
    else "未超出限制";
  }
}
?>

希望本文所述对大家基于ThinkPHP框架的php程序设计有所帮助。