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// Copyright (C) 2011 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
#ifndef LOGGER_IMPL_H
#define LOGGER_IMPL_H
#include <stdarg.h>
#include <time.h>
#include <iostream>
#include <cstdlib>
#include <string>
#include <map>
#include <utility>
#include <boost/noncopyable.hpp>
// log4cplus logger header file
#include <log4cplus/logger.h>
// Kea logger files
#include <log/logger_level_impl.h>
#include <log/message_types.h>
#include <log/interprocess/interprocess_sync.h>
namespace isc {
namespace log {
/// \brief Console Logger Implementation
///
/// The logger uses a "pimpl" idiom for implementation, where the base logger
/// class contains little more than a pointer to the implementation class, and
/// all actions are carried out by the latter.
///
/// This particular implementation is based on log4cplus (from sourceforge:
/// http://log4cplus.sourceforge.net). Particular items of note:
///
/// a) Kea loggers have names of the form "program.sublogger". In other
/// words, each of the loggers is a sub-logger of the main program logger.
/// In log4cplus, there is a root logger (called "root" according to the
/// documentation, but actually unnamed) and all loggers created are subloggers
/// if it.
///
/// In this implementation, the log4cplus root logger is unused. Instead, the
/// Kea root logger is created as a child of the log4cplus root logger,
/// and all other loggers used in the program are created as sub-loggers of
/// that. In this way, the logging system can just include the name of the
/// logger in each message without the need to specially consider if the
/// message is the root logger or not.
///
/// b) The idea of debug levels is implemented. See logger_level.h and
/// logger_level_impl.h for more details on this.
class LoggerImpl : public boost::noncopyable {
public:
/// \brief Constructor
///
/// Creates a logger of the specific name.
///
/// \param name Name of the logger.
LoggerImpl(const std::string& name);
/// \brief Destructor
virtual ~LoggerImpl();
/// \brief Get the full name of the logger (including the root name)
virtual std::string getName() {
return (name_);
}
/// \brief Set Severity Level for Logger
///
/// Sets the level at which this logger will log messages. If none is set,
/// the level is inherited from the parent.
///
/// \param severity Severity level to log
/// \param dbglevel If the severity is DEBUG, this is the debug level.
/// This can be in the range 0 to 99 and controls the verbosity. A value
/// outside these limits is silently coerced to the nearest boundary.
virtual void setSeverity(Severity severity, int dbglevel = 1);
/// \brief Get Severity Level for Logger
///
/// \return The current logging level of this logger. In most cases though,
/// the effective logging level is what is required.
virtual Severity getSeverity();
/// \brief Get Effective Severity Level for Logger
///
/// \return The effective severity level of the logger. This is the same
/// as getSeverity() if the logger has a severity level set, but otherwise
/// is the severity of the parent.
virtual Severity getEffectiveSeverity();
/// \brief Return debug level
///
/// \return Current setting of debug level. This will be zero if the
/// the current severity level is not DEBUG.
virtual int getDebugLevel();
/// \brief Return effective debug level
///
/// \return Current setting of effective debug level. This will be zero if
/// the current effective severity level is not DEBUG.
virtual int getEffectiveDebugLevel();
/// \brief Returns if Debug Message Should Be Output
///
/// \param dbglevel Level for which debugging is checked. Debugging is
/// enabled only if the logger has DEBUG enabled and if the dbglevel
/// checked is less than or equal to the debug level set for the logger.
virtual bool isDebugEnabled(int dbglevel = MIN_DEBUG_LEVEL) {
Level level(DEBUG, dbglevel);
return logger_.isEnabledFor(LoggerLevelImpl::convertFromBindLevel(level));
}
/// \brief Is INFO Enabled?
virtual bool isInfoEnabled() {
return (logger_.isEnabledFor(log4cplus::INFO_LOG_LEVEL));
}
/// \brief Is WARNING Enabled?
virtual bool isWarnEnabled() {
return (logger_.isEnabledFor(log4cplus::WARN_LOG_LEVEL));
}
/// \brief Is ERROR Enabled?
virtual bool isErrorEnabled() {
return (logger_.isEnabledFor(log4cplus::ERROR_LOG_LEVEL));
}
/// \brief Is FATAL Enabled?
virtual bool isFatalEnabled() {
return (logger_.isEnabledFor(log4cplus::FATAL_LOG_LEVEL));
}
/// \brief Raw output
///
/// Writes the message with time into the log. Used by the Formatter
/// to produce output.
///
/// \param severity Severity of the message. (This controls the prefix
/// label output with the message text.)
/// \param message Text of the message.
void outputRaw(const Severity& severity, const std::string& message);
/// \brief Look up message text in dictionary
///
/// This gets you the unformatted text of message for given ID.
std::string* lookupMessage(const MessageID& id);
/// \brief Replace the interprocess synchronization object
///
/// If this method is called with NULL as the argument, it throws a
/// BadInterprocessSync exception.
///
/// \param sync The logger uses this synchronization object for
/// synchronizing output of log messages. It should be deletable and
/// the ownership is transferred to the logger implementation.
/// If NULL is passed, a BadInterprocessSync exception is thrown.
void setInterprocessSync(isc::log::interprocess::InterprocessSync* sync);
/// \brief Equality
///
/// Check if two instances of this logger refer to the same stream.
/// (This method is principally for testing.)
///
/// \return true if the logger objects are instances of the same logger.
bool operator==(const LoggerImpl& other) {
return (name_ == other.name_);
}
private:
std::string name_; ///< Full name of this logger
log4cplus::Logger logger_; ///< Underlying log4cplus logger
isc::log::interprocess::InterprocessSync* sync_;
};
} // namespace log
} // namespace isc
#endif // LOGGER_IMPL_H
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