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#pragma once
#include <IO/BufferWithOwnMemory.h>
#include <IO/SeekableReadBuffer.h>
#include <IO/WithFileName.h>
#include <Interpreters/Context_fwd.h>
#include <base/time.h>
#include <functional>
#include <utility>
#include <string>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#ifndef O_DIRECT
#define O_DIRECT 00040000
#endif
namespace DB
{
class ReadBufferFromFileBase : public BufferWithOwnMemory<SeekableReadBuffer>, public WithFileName, public WithFileSize
{
public:
ReadBufferFromFileBase();
ReadBufferFromFileBase(
size_t buf_size,
char * existing_memory,
size_t alignment,
std::optional<size_t> file_size_ = std::nullopt);
~ReadBufferFromFileBase() override;
/// It is possible to get information about the time of each reading.
struct ProfileInfo
{
size_t bytes_requested;
size_t bytes_read;
size_t nanoseconds;
};
using ProfileCallback = std::function<void(ProfileInfo)>;
/// CLOCK_MONOTONIC_COARSE is more than enough to track long reads - for example, hanging for a second.
void setProfileCallback(const ProfileCallback & profile_callback_, clockid_t clock_type_ = CLOCK_MONOTONIC_COARSE)
{
profile_callback = profile_callback_;
clock_type = clock_type_;
}
size_t getFileSize() override;
void setProgressCallback(ContextPtr context);
protected:
std::optional<size_t> file_size;
ProfileCallback profile_callback;
clockid_t clock_type{};
};
}
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