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60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
#pragma once
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#include <DB/IO/IBufferAIO.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/BufferWithOwnMemory.h>
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#include <statdaemons/AIO.h>
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#include <unistd.h>
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#include <fcntl.h>
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namespace DB
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{
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/** Класс для асинхронной записи данных.
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* Все размеры и смещения должны быть кратны 512 байтам.
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*/
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class WriteBufferAIO : public IBufferAIO, public BufferWithOwnMemory<WriteBuffer>
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{
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public:
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WriteBufferAIO(const std::string & filename_, size_t buffer_size_ = DBMS_DEFAULT_BUFFER_SIZE, int flags_ = -1, mode_t mode_ = 0666,
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char * existing_memory_ = nullptr);
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~WriteBufferAIO() override;
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WriteBufferAIO(const WriteBufferAIO &) = delete;
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WriteBufferAIO & operator=(const WriteBufferAIO &) = delete;
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off_t seek(off_t off, int whence = SEEK_SET);
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void truncate(off_t length = 0);
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void sync();
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std::string getFileName() const noexcept override { return filename; }
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int getFD() const noexcept override { return fd; }
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private:
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void nextImpl() override;
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void waitForCompletion() override;
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void swapBuffers() noexcept override;
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private:
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/// Буфер для асинхронных операций записи данных.
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BufferWithOwnMemory<WriteBuffer> flush_buffer;
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iocb request;
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std::vector<iocb *> request_ptrs;
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std::vector<io_event> events;
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AIOContext aio_context;
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const std::string filename;
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off_t pos_in_file = 0;
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int fd = -1;
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/// Асинхронная операция записи ещё не завершилась.
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bool is_pending_write = false;
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/// Было получено исключение.
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bool got_exception = false;
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};
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}
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