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| -rw-r--r-- | src/lib/log/logger_manager.h | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/lib/log/logger_manager.h b/src/lib/log/logger_manager.h new file mode 100644 index 0000000..1ddea6d --- /dev/null +++ b/src/lib/log/logger_manager.h @@ -0,0 +1,173 @@ +// Copyright (C) 2011-2019 Internet Systems Consortium, Inc. ("ISC") +// +// This Source Code Form is subject to the terms of the Mozilla Public +// License, v. 2.0. If a copy of the MPL was not distributed with this +// file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#ifndef LOGGER_MANAGER_H +#define LOGGER_MANAGER_H + +#include <exceptions/exceptions.h> +#include <log/logger_specification.h> + +#include <boost/noncopyable.hpp> + +#include <mutex> + +// Generated if, when updating the logging specification, an unknown +// destination is encountered. +class UnknownLoggingDestination : public isc::Exception { +public: + UnknownLoggingDestination(const char* file, size_t line, const char* what) : + isc::Exception(file, line, what) + {} +}; + +namespace isc { +namespace log { + +class LoggerManagerImpl; + +/// \brief Logger Manager +/// +/// The logger manager class exists to process the set of logger specifications +/// and use them to set up the logging in the program appropriately. +/// +/// To isolate the underlying implementation from basic processing, the +/// LoggerManager is implemented using the "pimpl" idiom. + +class LoggerManager : public boost::noncopyable { +public: + /// \brief Constructor + LoggerManager(); + + /// \brief Destructor + ~LoggerManager(); + + /// \brief Process Specifications + /// + /// Replaces the current logging configuration by the one given. + /// + /// \param start Iterator pointing to the start of the collection of + /// logging specifications. + /// \param finish Iterator pointing to the end of the collection of + /// logging specification. + template <typename T> + void process(T start, T finish) { + processInit(); + for (T i = start; i != finish; ++i) { + processSpecification(*i); + } + processEnd(); + } + + /// \brief Process a single specification + /// + /// A convenience function for a single specification. + /// + /// \param spec Specification to process + void process(const LoggerSpecification& spec) { + processInit(); + processSpecification(spec); + processEnd(); + } + + /// \brief Process 'empty' specification + /// + /// This will disable any existing output options, and set + /// the logging to go to the built-in default (stdout). + /// If the logger has been initialized with buffering enabled, + /// all log messages up to now shall be printed to stdout. + /// + /// This is mainly useful in scenarios where buffering is needed, + /// but it turns out there are no logging specifications to + /// handle. + void process() { + processInit(); + processEnd(); + } + + /// \brief Run-Time Initialization + /// + /// Performs run-time initialization of the logger system, in particular + /// supplying the root logger name and name of a replacement message file. + /// + /// This must be the first logging function called in the program. If + /// an attempt is made to log a message before this is function is called, + /// the results will be dependent on the underlying logging package. + /// + /// Any duplicate log IDs encountered are reported as warning, after which + /// the global duplicates vector is cleared + /// + /// \param root Name of the root logger. This should be set to the name of + /// the program. + /// \param severity Severity at which to log + /// \param dbglevel Debug severity (ignored if "severity" is not "DEBUG") + /// \param file Name of the local message file. This must be NULL if there + /// is no local message file. + /// \param buffer If true, all log messages will be buffered until one of + /// the \c process() methods is called. If false, initial logging + /// shall go to the default output (i.e. stdout) + static void init(const std::string& root, + isc::log::Severity severity = isc::log::INFO, + int dbglevel = 0, const char* file = NULL, + bool buffer = false); + + /// \brief List duplicated log messages. + /// + /// Lists the duplicated log messages using warning severity. Then, it + /// clears the list of duplicated messages. This method is called by the + /// \c init method and by the \c isc::hooks::LibraryManager when the new + /// hooks library is loaded. + static void logDuplicatedMessages(); + + /// \brief Reset logging + /// + /// Resets logging to whatever was set in the call to init(), expect for + /// the buffer option. + static void reset(); + + /// \brief Read local message file + /// + /// Reads the local message file into the global dictionary, overwriting + /// existing messages. If the file contained any message IDs not in the + /// dictionary, they are listed in a warning message. + /// + /// \param file Name of the local message file + static void readLocalMessageFile(const char* file); + + /// \brief Return a process-global mutex that's used for mutual + /// exclusion among threads of a single process during logging + /// calls. + static std::mutex& getMutex(); + +private: + /// \brief Initialize Processing + /// + /// Initializes the processing of a list of specifications by resetting all + /// loggers to their defaults, which is to pass the message to their + /// parent logger. (Except for the root logger, where the default action is + /// to output the message.) + void processInit(); + + /// \brief Process Logging Specification + /// + /// Processes the given specification. It is assumed at this point that + /// either the logger does not exist or has been made inactive. + void processSpecification(const LoggerSpecification& spec); + + /// \brief End Processing + /// + /// Place holder for finish processing. + /// TODO: Check that the root logger has something enabled + void processEnd(); + + // Members + LoggerManagerImpl* impl_; ///< Pointer to implementation +}; + +} // namespace log +} // namespace isc + + +#endif // LOGGER_MANAGER_H |