library/cpp/logger/backend.h


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#pragma once

#include "priority.h"

#include <util/generic/noncopyable.h>

#include <cstddef>
 
struct TLogRecord; 

// NOTE: be aware that all `TLogBackend`s are registred in singleton.
class TLogBackend: public TNonCopyable { 
public: 
    TLogBackend() noexcept; 
    virtual ~TLogBackend(); 
 
    virtual void WriteData(const TLogRecord& rec) = 0; 
    virtual void ReopenLog() = 0; 

    // Does not guarantee consistency with previous WriteData() calls:
    // log entries could be written to the new (reopened) log file due to
    // buffering effects.
    virtual void ReopenLogNoFlush();

    virtual ELogPriority FiltrationLevel() const;

    static void ReopenAllBackends(bool flush = true);

    virtual size_t QueueSize() const;
};