LogStreamBuf Class Reference

Stream buffer used by LogStream. More...

#include <OpenMS/CONCEPT/LogStream.h>

Inheritance diagram for LogStreamBuf:

Classes
struct	LogCacheStruct
	Holds a counter of occurrences and an index for the occurrence sequence of the corresponding log message. More...
struct	StreamStruct
	Holds a stream that is connected to the LogStream. It also includes the minimum and maximum level at which the LogStream redirects messages to this stream. More...

Public Member Functions
void	clearCache ()
Constructors and Destructors
	LogStreamBuf (std::string log_level=UNKNOWN_LOG_LEVEL)
virtual	~LogStreamBuf ()
Stream methods
virtual int	sync ()
virtual int	overflow (int c=-1)
Level methods
void	setLevel (std::string level)
std::string	getLevel ()

Static Public Attributes
Constants
static const time_t	MAX_TIME
static const std::string	UNKNOWN_LOG_LEVEL

Protected Member Functions
void	distribute_ (std::string outstring)
	Distribute a new message to connected streams. More...
std::string	expandPrefix_ (const std::string &prefix, time_t time) const
	Interpret the prefix format string and return the expanded prefix. More...

Protected Attributes
char *	pbuf_
std::string	level_
std::list< StreamStruct >	stream_list_
std::string	incomplete_line_

Friends
class	LogStream

Caching
Size	log_cache_counter_
std::map< std::string, LogCacheStruct >	log_cache_
	Cache of the last two log messages. More...
std::map< Size, std::string >	log_time_cache_
	Cache of the occurrence sequence of the last two log messages. More...
bool	isInCache_ (std::string const &line)
	Checks if the line is already in the cache. More...
std::string	addToCache_ (std::string const &line)
Size	getNextLogCounter_ ()
	Returns the next free index for a log message. More...

Detailed Description

Stream buffer used by LogStream.

This class implements the low level behavior of LogStream . It takes care of the buffers and stores the lines written into the LogStream object. It also contains a list of streams that are associated with the LogStream object. This list contains pointers to the streams and their minimum and maximum log level. Each line entered in the LogStream is marked with its time (in fact, the time LogStreamBuf::sync was called) and its loglevel. The loglevel is determined by either the current loglevel (as set by LogStream::setLevel or a temporary level (as set by LogStream::level for a single line only). For each line stored, the list of associated streams is checked whether the loglevel falls into the range declared by the stream's minimum and maximum level. If this condition is met, the logline (with its prefix, see LogStream::setPrefix ) is also copied to the associated stream and this stream is flushed, too.

Constructor & Destructor Documentation

LogStreamBuf()

LogStreamBuf ( std::string  log_level = UNKNOWN_LOG_LEVEL )

explicit

Create a new LogStreamBuf object and set the level to log_level

Parameters

log_level

The log level of the LogStreamBuf (default is unknown)

~LogStreamBuf()

virtual ~LogStreamBuf ( )

virtual

Destruct the buffer and free all stored messages strings.

Member Function Documentation

addToCache_()

std::string addToCache_ ( std::string const &  line )

protected

Adds the new line to the cache and removes an old one if necessary

Parameters

line	The Log message that should be added to the cache

Returns

An additional massage if a re-occurring message was removed from the cache

clearCache()

void clearCache

(

)

Checks if some of the cached entries where sent more then once to the LogStream and (if necessary) prints a corresponding messages into all affected Logs

distribute_()

void distribute_ ( std::string  outstring )

protected

Distribute a new message to connected streams.

expandPrefix_()

std::string expandPrefix_ ( const std::string &  prefix, time_t  time  ) const

protected

Interpret the prefix format string and return the expanded prefix.

getLevel()

std::string getLevel

(

)

Returns the LogLevel of this LogStream

getNextLogCounter_()

Size getNextLogCounter_ ( )

protected

Returns the next free index for a log message.

isInCache_()

bool isInCache_ ( std::string const &  line )

protected

Checks if the line is already in the cache.

overflow()

virtual int overflow ( int  c = -1 )

virtual

This method calls sync and streambuf::overflow(c) to prevent a buffer overflow.

setLevel()

void setLevel

(

std::string

level

)

Set the level of the LogStream

Parameters

level

The new LogLevel

sync()

virtual int sync ( )

virtual

This method is called as soon as the ostream is flushed (especially this method is called by flush or endl). It transfers the contents of the streambufs putbuffer into a logline if a newline or linefeed character is found in the buffer ("\n" or "\r" resp.). The line is then removed from the putbuffer. Incomplete lines (not terminated by "\n" / "\r" are stored in incomplete_line_.

Friends And Related Function Documentation

LogStream

friend class LogStream

friend

Member Data Documentation

incomplete_line_

std::string incomplete_line_

protected

level_

std::string level_

protected

log_cache_

std::map<std::string, LogCacheStruct> log_cache_

protected

Cache of the last two log messages.

log_cache_counter_

Size log_cache_counter_

protected

Sequential counter to remember the sequence of occurrence of the cached log messages

log_time_cache_

std::map<Size, std::string> log_time_cache_

protected

Cache of the occurrence sequence of the last two log messages.

MAX_TIME

const time_t MAX_TIME

static

pbuf_

char* pbuf_

protected

stream_list_

std::list<StreamStruct> stream_list_

protected

UNKNOWN_LOG_LEVEL

const std::string UNKNOWN_LOG_LEVEL

static