我们可以修改 CLogger 的 init方法：
private $_hasInitLog = false;
private $_needLogLevels = array();
public function log($message,$level='info',$category='application')
{
if ( ! $this->_hasInitLog)
{
$this->_hasInitLog = true;
$this->_needLogLevels = Yii::app()->log->getNeedLogLeves();
}
// 不需要路由的级别，直接放弃
if ($this->_needLogLevels && ! in_array($level, $this->_needLogLevels))
{
return;
}
<?php
/**
* 重写了 CLogRouter ，将 router 的初始化推迟
* 并分析路由的配置信息，将需要路由的级别传递给 CLogger ，以直接放弃掉不需要路由的信息，例如profile级别的，以节省内存开销
* 其实分类也可以像上面那么干的，但是我们一般日志路由会记录所有的分类吧
*/
class MyLogRouter extends CApplicationComponent
{
private $_routes=array();
private $_routeInitialized = false;
private $_needLogLevels = array();
public function init()
{
parent::init();
Yii::getLogger()->attachEventHandler('onFlush',array($this,'collectLogs'));
Yii::app()->attachEventHandler('onEndRequest',array($this,'processLogs'));
}
protected function initRoute()
{
if ( ! $this->_routeInitialized)
{
foreach($this->_routes as $name=>$route)
{
$route=Yii::createComponent($route);
$route->init();
$this->_routes[$name]=$route;
}
$this->_routeInitialized = true;
}
}
public function getNeedLogLeves()
{
return $this->_needLogLevels ? array_unique($this->_needLogLevels) : array();
}
public function getRoutes()
{
return new CMap($this->_routes);
}
public function setRoutes($config)
{
foreach($config as $name=>$route)
{
$this->_routes[$name]=$route;
if (isset($this->_needLogLevels) && isset($route['levels']) && trim($route['levels']) != '')
{
$this->_needLogLevels = array_merge($this->_needLogLevels, preg_split('/[\s,]+/',strtolower($route['levels']),-1,PREG_SPLIT_NO_EMPTY));
}
else
{
$this->_needLogLevels = null;
}
}
}
public function collectLogs($event)
{
$this->initRoute();
$logger=Yii::getLogger();
$dumpLogs=isset($event->params['dumpLogs']) && $event->params['dumpLogs'];
foreach($this->_routes as $route)
{
if($route->enabled)
$route->collectLogs($logger,$dumpLogs);
}
}
public function processLogs($event)
{
$this->initRoute();
$logger=Yii::getLogger();
foreach($this->_routes as $route)
{
if($route->enabled)
$route->collectLogs($logger,true);
}
}
}
这样的话，完全不需要预加载 log 组件。
在发生日志记录的时候，初始化 log 组件。
还可以放弃记录需要要路由的信息，减小内存开销