RADLogging.h

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#ifndef RADLOGGING_H
#define RADLOGGING_H
 
#pragma once
 
#include <RADCore/RADLicenseGate.h>
 
#include <cstddef>
#include <memory>
#include <sstream>
#include <string>
 
namespace RADLogging {
 
    enum class Level {
        Trace = 0,
        Debug,
        Info,
        Warning,
        Error,
        Critical,
        Off
    };
 
    class Sink {
    public:
        virtual ~Sink() = default;
        virtual void write(Level level, const std::string& category, const std::string& line) = 0;
        virtual void flush() {}
    };
 
    class Logger {
    public:
        static Logger& instance();
        void start();
        void flush();
        void shutdown();
        void setLevel(Level level);
        Level level() const;
        void setCategoryEnabled(const std::string& category, bool enabled);
        bool shouldLog(Level level, const std::string& category) const;
        void addSink(std::shared_ptr<Sink> sink);
        void clearSinks();
        void log(Level level, std::string category, std::string message);
 
    private:
        Logger();
        ~Logger();
        struct Impl;
        std::unique_ptr<Impl> pImpl_;
    };
 
    class LogStream {
    public:
        LogStream(Level level, std::string category);
        ~LogStream();
        template<typename T>
        LogStream& operator<<(const T& value) {
            stream_ << value;
            return *this;
        }
 
    private:
        Level level_;
        std::string category_;
        std::ostringstream stream_;
    };
 
    std::shared_ptr<Sink> consoleSink(bool stderrForWarnings = true);
    std::shared_ptr<Sink> fileSink(const std::string& path);
    std::shared_ptr<Sink> rotatingFileSink(const std::string& path, size_t maxBytes, size_t maxFiles = 3);
    std::shared_ptr<Sink> syslogSink(std::string ident = "RADLib");
    std::string levelName(Level level);
 
} // namespace RADLogging
 
#define RADLOG_TRACE(category) RADLogging::LogStream(RADLogging::Level::Trace, category)
#define RADLOG_DEBUG(category) RADLogging::LogStream(RADLogging::Level::Debug, category)
#define RADLOG_INFO(category) RADLogging::LogStream(RADLogging::Level::Info, category)
#define RADLOG_WARNING(category) RADLogging::LogStream(RADLogging::Level::Warning, category)
#define RADLOG_ERROR(category) RADLogging::LogStream(RADLogging::Level::Error, category)
 
#endif