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44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#include <IO/createReadBufferFromFileBase.h>
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#include <IO/ReadBufferFromFile.h>
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#if defined(__linux__) || defined(__FreeBSD__)
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#include <IO/ReadBufferAIO.h>
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#endif
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#include <Common/ProfileEvents.h>
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namespace ProfileEvents
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{
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extern const Event CreatedReadBufferOrdinary;
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extern const Event CreatedReadBufferAIO;
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}
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namespace DB
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{
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#if !defined(__linux__)
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namespace ErrorCodes
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{
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extern const int NOT_IMPLEMENTED;
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}
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#endif
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std::unique_ptr<ReadBufferFromFileBase> createReadBufferFromFileBase(const std::string & filename_, size_t estimated_size,
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size_t aio_threshold, size_t buffer_size_, int flags_, char * existing_memory_, size_t alignment)
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{
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if ((aio_threshold == 0) || (estimated_size < aio_threshold))
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{
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ProfileEvents::increment(ProfileEvents::CreatedReadBufferOrdinary);
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return std::make_unique<ReadBufferFromFile>(filename_, buffer_size_, flags_, existing_memory_, alignment);
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}
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else
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{
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#if defined(__linux__) || defined(__FreeBSD__)
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ProfileEvents::increment(ProfileEvents::CreatedReadBufferAIO);
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return std::make_unique<ReadBufferAIO>(filename_, buffer_size_, flags_, existing_memory_);
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#else
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throw Exception("AIO is implemented only on Linux and FreeBSD", ErrorCodes::NOT_IMPLEMENTED);
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#endif
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}
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}
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}
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