const LEVEL_TRACE='trace';
const LEVEL_WARNING='warning';
const LEVEL_ERROR='error';
const LEVEL_INFO='info';
const LEVEL_PROFILE='profile';
CLogger爲所有日誌寫入和獲取提供接口,通過日誌路由管理類CLogRouter將日誌分發到不同日誌展現或存儲介質中。
日誌組件配置
'log'=>array(
'class'=>'CLogRouter',
'routes'=>array(
array(
'class'=>'CFileLogRoute',
'levels'=>'error, warning',
),
array(
'class'=>'CWebLogRoute',
'levels'=>'info',
'showInFireBug' => true
),
),
),
日誌路由初始化
在log組件被創建的時候,會通過CLogRouter::init()初始化配置中各個日誌路由,並添加刷新和請求結束事件,這個兩個事件對YII日誌性能提升有很大幫助。YII默認在一次請求中日誌的數量小於1000的情況下,日誌數據都放在內存中,當大於1000的時候執行onflush事件,將日誌刷新到接收介質上,當請求結束的時候執行onEndRequest再刷新一次日誌,這樣做減少了大量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($this,'processLogs'));
}
日誌調用
對日誌的操作是通過YII::log()靜態方法實現對CLogger的調用,下面是CLogger的log方法,日誌會保存在$this->_logs[]中,當觸發刷新事件時,執行刷新處理過程。
/**
* 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);
$this->_processing=false;
}
}
以觸發onflush事件爲例,日誌路由CLogRouter::collectLogs($event)將日誌對象傳給各個日誌的collectLogs()中,然後通過processLogs()來處理不同的日誌等級對應的展現方式。/**
* 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();
}
}
實例
Yii::log("test",CLogger::LEVEL_INFO);
Yii::log("test2",CLogger::LEVEL_INFO);
下面分別是CWebLogRoute在web中和chrome控制檯中顯示日誌的效果。(默認時間和北京時間相差8小時)