generic-library/poco
1
0
Fork 0
mirror of https://github.com/pocoproject/poco.git synced 2025-10-26 10:32:56 +01:00
Code Issues Projects Releases Wiki Activity

enh(FileStream): Add FileStreamBuf::resizeBuffer to set larger internal buffers. (#4621)

Browse Source 
Larger buffers improve performance significantly when streaming large quantity of data on very fast devices.
This commit is contained in:
Matej Kenda
2024-09-09 17:33:50 +02:00
committed by GitHub
parent 710c2a41f3
commit 91c256095f
8 changed files with 224 additions and 53 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
Foundation/include/Poco/FileStream_WIN32.h
View File

@@ -25,7 +25,6 @@
namespace Poco {
class Foundation_API FileStreamBuf: public BufferedBidirectionalStreamBuf
/// This stream buffer handles Fileio
{
@@ -48,10 +47,16 @@ public:
/// Closes the File stream buffer. Returns true if successful,
/// false otherwise.
std::streampos seekoff(std::streamoff off, std::ios::seekdir dir, std::ios::openmode mode = std::ios::in | std::ios::out);
bool resizeBuffer(std::streamsize bufferSize) override;
/// Resizes internal buffer. Minimum size is BUFFER_SIZE.
/// Minimum is used when requested size is smaller.
/// Buffer can be resized only when the file is not open.
/// Returns true if resize succeeded.
std::streampos seekoff(std::streamoff off, std::ios::seekdir dir, std::ios::openmode mode = std::ios::in | std::ios::out) override;
/// change position by offset, according to way and mode
std::streampos seekpos(std::streampos pos, std::ios::openmode mode = std::ios::in | std::ios::out);
std::streampos seekpos(std::streampos pos, std::ios::openmode mode = std::ios::in | std::ios::out) override;
/// change to specified position, according to mode
void flushToDisk();
@@ -69,13 +74,13 @@ protected:
BUFFER_SIZE = 4096
};
int readFromDevice(char* buffer, std::streamsize length);
int writeToDevice(const char* buffer, std::streamsize length);
int readFromDevice(char* buffer, std::streamsize length) override;
int writeToDevice(const char* buffer, std::streamsize length) override;
private:
std::string _path;
NativeHandle _handle;
UInt64 _pos;
UInt64 _pos {0};
};