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60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
#pragma once
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#include <sys/types.h>
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#include <DB/Common/CurrentMetrics.h>
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#include <DB/IO/WriteBufferFromFileDescriptor.h>
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namespace CurrentMetrics
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{
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extern const Metric OpenFileForWrite;
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}
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#ifndef O_DIRECT
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#define O_DIRECT 00040000
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#endif
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namespace DB
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{
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/** Accepts path to file and opens it, or pre-opened file descriptor.
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* Closes file by himself (thus "owns" a file descriptor).
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*/
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class WriteBufferFromFile : public WriteBufferFromFileDescriptor
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{
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protected:
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std::string file_name;
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CurrentMetrics::Increment metric_increment{CurrentMetrics::OpenFileForWrite};
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public:
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WriteBufferFromFile(
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const std::string & file_name_,
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size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
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int flags = -1,
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mode_t mode = 0666,
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char * existing_memory = nullptr,
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size_t alignment = 0);
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/// Use pre-opened file descriptor.
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WriteBufferFromFile(
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int fd,
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const std::string & original_file_name = {},
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size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
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char * existing_memory = nullptr,
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size_t alignment = 0);
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~WriteBufferFromFile() override;
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/// Close file before destruction of object.
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void close();
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std::string getFileName() const override
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{
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return file_name;
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}
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};
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}
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