event_logger.h

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class NOVTABLE event_logger : public service_base {
    FB2K_MAKE_SERVICE_INTERFACE(event_logger, service_base);
public:
    enum {
        severity_status,
        severity_warning,
        severity_error
    };
    void log_status(const char * line) {log_entry(line, severity_status);}
    void log_warning(const char * line) {log_entry(line, severity_warning);}
    void log_error(const char * line) {log_entry(line, severity_error);}
    
    virtual void log_entry(const char * line, unsigned severity) = 0;
};

class event_logger_fallback : public event_logger {
public:
    void log_entry(const char * line, unsigned) {console::print(line);}
};

class NOVTABLE event_logger_recorder : public event_logger {
    FB2K_MAKE_SERVICE_INTERFACE( event_logger_recorder , event_logger );
public:
    virtual void playback( event_logger::ptr playTo ) = 0;
};

class event_logger_recorder_impl : public event_logger_recorder {
public:
    void playback( event_logger::ptr playTo ) {
        for(auto i = m_entries.first(); i.is_valid(); ++i ) {
            playTo->log_entry( i->line.get_ptr(), i->severity );
        }
    }

    void log_entry( const char * line, unsigned severity ) {
        auto rec = m_entries.insert_last();
        rec->line = line;
        rec->severity = severity;
    }
private:

    struct entry_t {
        pfc::string_simple line;
        unsigned severity;
    };
    pfc::chain_list_v2_t< entry_t > m_entries;
};