LogStream Class Reference

Log Stream Class. More...

#include <OpenMS/CONCEPT/LogStream.h>

Inheritance diagram for LogStream:

Collaboration diagram for LogStream:

Public Member Functions
Constructors and Destructors
	LogStream (LogStreamBuf *buf=nullptr, bool delete_buf=true, std::ostream *stream=nullptr)
	~LogStream () override
	Clears all message buffers. More...
Stream Methods
LogStreamBuf *	rdbuf ()
LogStreamBuf *	operator-> ()
	Arrow operator. More...
Level methods
void	setLevel (std::string level)
std::string	getLevel ()

Associating Streams
typedef std::list< LogStreamBuf::StreamStruct >::iterator	StreamIterator
bool	delete_buffer_
void	insert (std::ostream &s)
void	remove (std::ostream &s)
void	insertNotification (std::ostream &s, LogStreamNotifier &target)
	Add a notification target. More...
void	setPrefix (const std::ostream &s, const std::string &prefix)
void	setPrefix (const std::string &prefix)
	Set prefix of all output streams, details see setPrefix method with ostream. More...
void	flush ()
StreamIterator	findStream_ (const std::ostream &stream)
bool	hasStream_ (std::ostream &stream)
bool	bound_ () const

Detailed Description

Log Stream Class.

Defines a log stream which features a cache and some formatting. For the developer, however, only some macros are of interest which will push the message that follows them into the appropriate stream:

Macros:

• OPENMS_LOG_FATAL_ERROR
• OPENMS_LOG_ERROR (non-fatal error are reported (processing continues))
• OPENMS_LOG_WARN (warning, a piece of information which should be read by the user, should be logged)
• OPENMS_LOG_INFO (information, e.g. a status should be reported)
• OPENMS_LOG_DEBUG (general debugging information - output be written to cout if debug_level > 0)

To use a specific logger of a log level simply use it as cerr or cout:
OPENMS_LOG_ERROR << " A bad error occurred ..."
Which produces an error message in the log.

Note

The log stream macros are thread safe and can be used in a multithreaded environment, the global variables are not! The macros are protected by a OPENMS_THREAD_CRITICAL directive (which translates to an OpenMP critical pragma), however there may be a small performance penalty to this.

Member Typedef Documentation

StreamIterator

typedef std::list<LogStreamBuf::StreamStruct>::iterator StreamIterator

private

Constructor & Destructor Documentation

LogStream()

LogStream	(	LogStreamBuf *	buf = nullptr,
		bool	delete_buf = true,
		std::ostream *	stream = nullptr
	)

Creates a new LogStream object that is not associated with any stream. If the argument stream is set to an output stream (e.g. cout) all output is send to that stream.

Parameters

buf
delete_buf
stream

~LogStream()

~LogStream ( )

override

Clears all message buffers.

Member Function Documentation

bound_()

bool bound_ ( ) const

private

findStream_()

StreamIterator findStream_ ( const std::ostream &  stream )

private

flush()

void flush

(

)

getLevel()

std::string getLevel

(

)

Returns the LogLevel of this LogStream

hasStream_()

bool hasStream_ ( std::ostream &  stream )

private

insert()

void insert

(

std::ostream &

s

)

Associate a new stream with this logstream. This method inserts a new stream into the list of associated streams and sets the corresponding minimum and maximum log levels. Any message that is subsequently logged, will be copied to this stream if its log level is between min_level and max_level. If min_level and max_level are omitted, all messages are copied to this stream. If min_level and max_level are equal, this function can be used to listen to a specified channel.

Parameters

s	a reference to the stream to be associated

Referenced by main().

insertNotification()

void insertNotification	(	std::ostream &	s,
		LogStreamNotifier &	target
	)

Add a notification target.

operator->()

LogStreamBuf* operator->

(

)

Arrow operator.

rdbuf()

LogStreamBuf* rdbuf

(

)

rdbuf method of ostream. This method is needed to access the LogStreamBuf object.

See also

std::ostream::rdbuf for more details.

remove()

void remove

(

std::ostream &

s

)

Remove an association with a stream.

Remove a stream from the stream list and avoid the copying of new messages to this stream.

If the stream was not in the list of associated streams nothing will happen.

Parameters

s	the stream to be removed

setLevel()

void setLevel

(

std::string

level

)

Set the level of the LogStream

Parameters

level

The new LogLevel

setPrefix() [1/2]

void setPrefix	(	const std::ostream &	s,
		const std::string &	prefix
	)

Set prefix for output to this stream. Each line written to the stream will be prefixed by this string. The string may also contain trivial format specifiers to include loglevel and time/date of the logged message.

The following format tags are recognized:

• y message type ("Error", "Warning", "Information", "-")
• T time (HH:MM:SS)
• t time in short format (HH:MM)
• D date (YYYY/MM/DD)
• d date in short format (MM/DD)
• S time and date (YYYY/MM/DD, HH:MM:SS)
• s time and date in short format (MM/DD, HH:MM)
• %% percent sign (escape sequence)

Parameters

s	The stream that will be prefixed.
prefix	The prefix used for the stream.

setPrefix() [2/2]

void setPrefix

(

const std::string &

prefix

)

Set prefix of all output streams, details see setPrefix method with ostream.

Member Data Documentation

delete_buffer_

bool delete_buffer_

private

flag needed by the destructor to decide whether the streambuf has to be deleted. If the default ctor is used to create the LogStreamBuf, delete_buffer_ is set to true and the ctor also deletes the buffer.