日志组件配置
'log'=>array( 'class'=>'CLogRouter', 'routes'=>array( array( 'class'=>'CFileLogRoute', 'levels'=>'error, warning', ), array( 'class'=>'CWebLogRoute', 'levels'=>'info', 'showInFireBug' => true ), ), ),
日志路由初始化
在log组件被创建的时候,会通过CLogRouter::init()初始化配置中各个日志路由,并添加刷新和请求结束事件,这个两个事件对YII日志性能提升有很大帮助。YII默认在一次请求中日志的数量小于1000的情况下,日志数据都放在内存中,当大于1000的时候执行onflush事件,将日志刷新到接收介质上,当请求结束的时候执行onEndRequest再刷新一次日志,这样做减少了大量IO操作。
/** * Initializes this application component. * This method is required by the IApplicationComponent interface. */ public function init() { parent::init(); foreach($this->_routes as $name=>$route) { $route=Yii::createComponent($route); $route->init(); $this->_routes[$name]=$route; } Yii::getLogger()->attachEventHandler('onFlush',array($this,'collectLogs')); Yii::app()->attachEventHandler('onEndRequest',array($this,'processLogs')); }
对日志的操作是通过YII::log()静态方法实现对CLogger的调用,下面是CLogger的log方法,日志会保存在$this->_logs[]中,当触发刷新事件时,执行刷新处理过程。
/** * Logs a message. * Messages logged by this method may be retrieved back via {@link getLogs}. * @param string $message message to be logged * @param string $level level of the message (e.g. 'Trace', 'Warning', 'Error'). It is case-insensitive. * @param string $category category of the message (e.g. 'system.web'). It is case-insensitive. * @see getLogs */ public function log($message,$level='info',$category='application') { $this->_logs[]=array($message,$level,$category,microtime(true)); $this->_logCount++; if($this->autoFlush>0 && $this->_logCount>=$this->autoFlush && !$this->_processing) { $this->_processing=true; $this->flush($this->autoDump); $this->_processing=false; } }以触发onflush事件为例,日志路由CLogRouter::collectLogs($event)将日志对象传给各个日志的collectLogs()中,然后通过processLogs()来处理不同的日志等级对应的展现方式。
/** * Retrieves filtered log messages from logger for further processing. * @param CLogger $logger logger instance * @param boolean $processLogs whether to process the logs after they are collected from the logger */ public function collectLogs($logger, $processLogs=false) { $logs=$logger->getLogs($this->levels,$this->categories); $this->logs=empty($this->logs) ? $logs : array_merge($this->logs,$logs); if($processLogs && !empty($this->logs)) { if($this->filter!==null) Yii::createComponent($this->filter)->filter($this->logs); $this->processLogs($this->logs); $this->logs=array(); } }
Yii::log("test",CLogger::LEVEL_INFO);
Yii::log("test2",CLogger::LEVEL_INFO);
下面分别是CWebLogRoute在web中和chrome控制台中显示日志的效果。(默认时间和北京时间相差8小时)