ClickHouse/dbms/src/IO/createWriteBufferFromFileBase.h
2018-09-04 22:34:34 +03:00

29 lines
778 B
C++

#pragma once
#include <IO/WriteBufferFromFileBase.h>
#include <string>
#include <memory>
namespace DB
{
/** Create an object to write data to a file.
* estimated_size - number of bytes to write
* aio_threshold - the minimum number of bytes for asynchronous writes
*
* If aio_threshold = 0 or estimated_size < aio_threshold, the write operations are executed synchronously.
* Otherwise, write operations are performed asynchronously.
*/
std::unique_ptr<WriteBufferFromFileBase> createWriteBufferFromFileBase(
const std::string & filename_,
size_t estimated_size,
size_t aio_threshold,
size_t buffer_size_ = DBMS_DEFAULT_BUFFER_SIZE,
int flags_ = -1,
mode_t mode = 0666,
char * existing_memory_ = nullptr,
size_t alignment = 0);
}