qpid/log/Statement.h File Reference

#include "qpid/Msg.h"
#include "qpid/CommonImportExport.h"
#include <boost/current_function.hpp>

Go to the source code of this file.

Classes
struct	qpid::log::LevelTraits
struct	qpid::log::Statement
	POD struct representing a logging statement in source code. More...
struct	qpid::log::Statement::Initializer
Namespaces
namespace	qpid
namespace	qpid::log
Defines
#define	QPID_LOG_STATEMENT_INIT(level)   { 0, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, (::qpid::log::level) }
#define	QPID_LOG_IF(LEVEL, TEST, MESSAGE)
	Like QPID_LOG but computes an additional boolean test expression to determine if the message should be logged.
#define	QPID_LOG(LEVEL, MESSAGE)   QPID_LOG_IF(LEVEL, true, MESSAGE);
	Macro for log statements.
Enumerations
enum	qpid::log::Level {   qpid::log::trace, qpid::log::debug, qpid::log::info, qpid::log::notice,   qpid::log::warning, qpid::log::error, qpid::log::critical }
	Debugging severity levels trace: High-volume debugging messages. More...

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Define Documentation

#define QPID_LOG	(	LEVEL,
		MESSAGE		)	QPID_LOG_IF(LEVEL, true, MESSAGE);

Macro for log statements.

Example of use:

 QPID_LOG(debug, "There are " << foocount << " foos in the bar.");
 QPID_LOG(error, boost::format("Dohickey %s exploded") % dohicky.name());

You can subscribe to log messages by level, by component, by filename or a combination

See also:

Configuration.

Parameters:

	LEVEL	severity Level for message, should be one of: debug, info, notice, warning, error, critical. NB no qpid::log:: prefix.
	MESSAGE	any object with an operator<<, or a sequence like of ostreamable objects separated by <<.

Definition at line 113 of file Statement.h.

#define QPID_LOG_IF	(	LEVEL,
		TEST,
		MESSAGE		)

Value:

do {                                                        \
        using ::qpid::log::Statement;                           \
        static Statement stmt_= QPID_LOG_STATEMENT_INIT(LEVEL); \
        static Statement::Initializer init_(stmt_);             \
        if (stmt_.enabled && (TEST))                            \
            stmt_.log(::qpid::Msg() << MESSAGE);                \
    } while(0)

Like QPID_LOG but computes an additional boolean test expression to determine if the message should be logged.

Evaluation of both the test and message expressions occurs only if the requested log level is enabled.

Parameters:

	LEVEL	severity Level for message, should be one of: debug, info, notice, warning, error, critical. NB no qpid::log:: prefix.
	TEST	message is logged only if expression TEST evaluates to true.
	MESSAGE	any object with an operator<<, or a sequence like of ostreamable objects separated by <<.

Definition at line 89 of file Statement.h.

#define QPID_LOG_STATEMENT_INIT

(

level

)

{ 0, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, (::qpid::log::level) }

Definition at line 75 of file Statement.h.