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CLogger

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Package	system.logging
Inheritance	class CLogger » CComponent
Since	1.0
Version	$Id: CLogger.php 1678 2010-01-07 21:02:00Z qiang.xue $

CLogger records log messages in memory.

CLogger implements the methods to retrieve the messages with various filter conditions, including log levels and log categories.

Public Properties

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Property	Type	Description	Defined By
autoFlush	integer	how many messages should be logged before they are flushed to destinations.	CLogger
executionTime	float	Returns the total time for serving the current request.	CLogger
logs	array	Retrieves log messages.	CLogger
memoryUsage	integer	Returns the memory usage of the current application.	CLogger
profilingResults	array	Returns the profiling results.	CLogger

Public Methods

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Method	Description	Defined By
__call()	Calls the named method which is not a class method.	CComponent
__get()	Returns a property value, an event handler list or a behavior based on its name.	CComponent
__isset()	Checks if a property value is null.	CComponent
__set()	Sets value of a component property.	CComponent
__unset()	Sets a component property to be null.	CComponent
asa()	Returns the named behavior object.	CComponent
attachBehavior()	Attaches a behavior to this component.	CComponent
attachBehaviors()	Attaches a list of behaviors to the component.	CComponent
attachEventHandler()	Attaches an event handler to an event.	CComponent
canGetProperty()	Determines whether a property can be read.	CComponent
canSetProperty()	Determines whether a property can be set.	CComponent
detachBehavior()	Detaches a behavior from the component.	CComponent
detachBehaviors()	Detaches all behaviors from the component.	CComponent
detachEventHandler()	Detaches an existing event handler.	CComponent
disableBehavior()	Disables an attached behavior.	CComponent
disableBehaviors()	Disables all behaviors attached to this component.	CComponent
enableBehavior()	Enables an attached behavior.	CComponent
enableBehaviors()	Enables all behaviors attached to this component.	CComponent
evaluateExpression()	Evaluates a PHP expression or callback under the context of this component.	CComponent
flush()	Removes all recorded messages from the memory.	CLogger
getEventHandlers()	Returns the list of attached event handlers for an event.	CComponent
getExecutionTime()	Returns the total time for serving the current request.	CLogger
getLogs()	Retrieves log messages.	CLogger
getMemoryUsage()	Returns the memory usage of the current application.	CLogger
getProfilingResults()	Returns the profiling results.	CLogger
hasEvent()	Determines whether an event is defined.	CComponent
hasEventHandler()	Checks whether the named event has attached handlers.	CComponent
hasProperty()	Determines whether a property is defined.	CComponent
log()	Logs a message.	CLogger
onFlush()	Raises an `onFlush` event.	CLogger
raiseEvent()	Raises an event.	CComponent

Events

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Event	Description	Defined By
onFlush	Raises an `onFlush` event.	CLogger

Property Details

autoFlush property (available since v1.1.0)

public integer $autoFlush;

how many messages should be logged before they are flushed to destinations. Defaults to 10,000, meaning for every 10,000 messages, the flush method will be automatically invoked once. If this is 0, it means messages will never be flushed automatically.

executionTime property read-only

public float getExecutionTime()

Returns the total time for serving the current request. This method calculates the difference between now and the timestamp defined by constant YII_BEGIN_TIME. To estimate the execution time more accurately, the constant should be defined as early as possible (best at the beginning of the entry script.)

logs property read-only

public array getLogs(string $levels='', string $categories='')

Retrieves log messages.

Messages may be filtered by log levels and/or categories. A level filter is specified by a list of levels separated by comma or space (e.g. 'trace, error'). A category filter is similar to level filter (e.g. 'system, system.web'). A difference is that in category filter you can use pattern like 'system.*' to indicate all categories starting with 'system'.

If you do not specify level filter, it will bring back logs at all levels. The same applies to category filter.

Level filter and category filter are combinational, i.e., only messages satisfying both filter conditions will be returned.

memoryUsage property read-only

public integer getMemoryUsage()

Returns the memory usage of the current application. This method relies on the PHP function memory_get_usage(). If it is not available, the method will attempt to use OS programs to determine the memory usage. A value 0 will be returned if the memory usage can still not be determined.

profilingResults property read-only (available since v1.0.6)

public array getProfilingResults(string $token=NULL, string $category=NULL, boolean $refresh=false)

Returns the profiling results. The results may be filtered by token and/or category. If no filter is specified, the returned results would be an array with each element being array($token,$category,$time). If a filter is specified, the results would be an array of timings.

Method Details

flush() method (available since v1.1.0)

public void flush()

Removes all recorded messages from the memory. This method will raise an onFlush event. The attached event handlers can process the log messages before they are removed.

getExecutionTime() method

public float getExecutionTime()
{return}	float	the total time for serving the current request.

Returns the total time for serving the current request. This method calculates the difference between now and the timestamp defined by constant YII_BEGIN_TIME. To estimate the execution time more accurately, the constant should be defined as early as possible (best at the beginning of the entry script.)

getLogs() method

public array getLogs(string $levels='', string $categories='')
$levels	string	level filter
$categories	string	category filter
{return}	array	list of messages. Each array elements represents one message with the following structure: array( [0] => message (string) [1] => level (string) [2] => category (string) [3] => timestamp (float, obtained by microtime(true));

Retrieves log messages.

Messages may be filtered by log levels and/or categories. A level filter is specified by a list of levels separated by comma or space (e.g. 'trace, error'). A category filter is similar to level filter (e.g. 'system, system.web'). A difference is that in category filter you can use pattern like 'system.*' to indicate all categories starting with 'system'.

If you do not specify level filter, it will bring back logs at all levels. The same applies to category filter.

Level filter and category filter are combinational, i.e., only messages satisfying both filter conditions will be returned.

getMemoryUsage() method

public integer getMemoryUsage()
{return}	integer	memory usage of the application (in bytes).

Returns the memory usage of the current application. This method relies on the PHP function memory_get_usage(). If it is not available, the method will attempt to use OS programs to determine the memory usage. A value 0 will be returned if the memory usage can still not be determined.

getProfilingResults() method (available since v1.0.6)

public array getProfilingResults(string $token=NULL, string $category=NULL, boolean $refresh=false)
$token	string	token filter. Defaults to null, meaning not filtered by token.
$category	string	category filter. Defaults to null, meaning not filtered by category.
$refresh	boolean	whether to refresh the internal timing calculations. If false, only the first time calling this method will the timings be calculated internally.
{return}	array	the profiling results.

Returns the profiling results. The results may be filtered by token and/or category. If no filter is specified, the returned results would be an array with each element being array($token,$category,$time). If a filter is specified, the results would be an array of timings.

log() method

public void log(string $message, string $level='info', string $category='application')
$message	string	message to be logged
$level	string	level of the message (e.g. 'Trace', 'Warning', 'Error'). It is case-insensitive.
$category	string	category of the message (e.g. 'system.web'). It is case-insensitive.

Logs a message. Messages logged by this method may be retrieved back via getLogs.

public void onFlush(CEvent $event)
$event	CEvent	the event parameter