library/cpp/logger/thread.h


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#pragma once

#include "backend.h" 
 
#include <util/generic/ptr.h>
 
#include <functional>

class TThreadedLogBackend: public TLogBackend { 
public: 
    TThreadedLogBackend(TLogBackend* slave); 
    TThreadedLogBackend(TLogBackend* slave, size_t queuelen, std::function<void()> queueOverflowCallback = {});
    ~TThreadedLogBackend() override; 
 
    void WriteData(const TLogRecord& rec) override; 
    void ReopenLog() override; 
    void ReopenLogNoFlush() override;
    size_t QueueSize() const override;
 
    // Write an emergency message when the memory allocator is corrupted. 
    // The TThreadedLogBackend object can't be used after this method is called. 
    void WriteEmergencyData(const TLogRecord& rec); 

private: 
    class TImpl; 
    THolder<TImpl> Impl_; 
}; 

class TOwningThreadedLogBackend: private THolder<TLogBackend>, public TThreadedLogBackend {
public:
    TOwningThreadedLogBackend(TLogBackend* slave);
    TOwningThreadedLogBackend(TLogBackend* slave, size_t queuelen, std::function<void()> queueOverflowCallback = {});
    ~TOwningThreadedLogBackend() override;
};