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#pragma once
#include <Common/Throttler_fwd.h>
#include <IO/AsynchronousReadBufferFromFileDescriptor.h>
#include <IO/OpenedFileCache.h>
namespace DB
{
/* NOTE: Unused */
class AsynchronousReadBufferFromFile : public AsynchronousReadBufferFromFileDescriptor
{
protected:
std::string file_name;
public:
explicit AsynchronousReadBufferFromFile(
IAsynchronousReader & reader_,
Priority priority_,
const std::string & file_name_,
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
int flags = -1,
char * existing_memory = nullptr,
size_t alignment = 0,
std::optional<size_t> file_size_ = std::nullopt);
/// Use pre-opened file descriptor.
explicit AsynchronousReadBufferFromFile(
IAsynchronousReader & reader_,
Priority priority_,
int & fd, /// Will be set to -1 if constructor didn't throw and ownership of file descriptor is passed to the object.
const std::string & original_file_name = {},
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
char * existing_memory = nullptr,
size_t alignment = 0,
std::optional<size_t> file_size_ = std::nullopt);
~AsynchronousReadBufferFromFile() override;
/// Close file before destruction of object.
void close();
std::string getFileName() const override
{
return file_name;
}
};
/** Similar to AsynchronousReadBufferFromFile but also transparently shares open file descriptors.
*/
class AsynchronousReadBufferFromFileWithDescriptorsCache : public AsynchronousReadBufferFromFileDescriptor
{
private:
std::string file_name;
OpenedFileCache::OpenedFilePtr file;
public:
AsynchronousReadBufferFromFileWithDescriptorsCache(
IAsynchronousReader & reader_,
Priority priority_,
const std::string & file_name_,
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
int flags = -1,
char * existing_memory = nullptr,
size_t alignment = 0,
std::optional<size_t> file_size_ = std::nullopt,
ThrottlerPtr throttler_ = {})
: AsynchronousReadBufferFromFileDescriptor(reader_, priority_, -1, buf_size, existing_memory, alignment, file_size_, throttler_)
, file_name(file_name_)
{
file = OpenedFileCache::instance().get(file_name, flags);
fd = file->getFD();
}
~AsynchronousReadBufferFromFileWithDescriptorsCache() override;
std::string getFileName() const override
{
return file_name;
}
};
}
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