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35 lines
823 B
C++
35 lines
823 B
C++
#include <IO/WriteBuffer.h>
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#include <IO/IReadableWriteBuffer.h>
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#include <IO/WriteBufferFromFile.h>
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#include <Poco/TemporaryFile.h>
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namespace DB
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{
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/// Rereadable WriteBuffer, could be used as disk buffer
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/// Creates unique temporary in directory (and directory itself)
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class WriteBufferFromTemporaryFile : public WriteBufferFromFile, public IReadableWriteBuffer
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{
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public:
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using Ptr = std::shared_ptr<WriteBufferFromTemporaryFile>;
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static Ptr create(const std::string & tmp_dir);
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~WriteBufferFromTemporaryFile() override;
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protected:
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WriteBufferFromTemporaryFile(std::unique_ptr<Poco::TemporaryFile> && tmp_file);
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std::shared_ptr<ReadBuffer> getReadBufferImpl() override;
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protected:
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std::unique_ptr<Poco::TemporaryFile> tmp_file;
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friend class ReadBufferFromTemporaryWriteBuffer;
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};
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}
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