47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
|
/**
|
||
|
|
* @file
|
||
|
|
* @brief
|
||
|
|
*
|
||
|
|
* @author Thomas Escher
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef CACHE_IO_H
|
||
|
|
#define CACHE_IO_H
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Serialization management for binary data, intended for use in CacheHandlers.
|
||
|
|
*
|
||
|
|
* This class manages the assignment of unique IDs for CacheHandlers to use to identify their files.
|
||
|
|
* Data is (de)serialized via read and write calls and existance (if so, the file-/datasize too) can be checked via check.
|
||
|
|
* All files are created in a directory given by createTemporaryDirectory which has to be called before and read/writes to function properly. All files are named 'ddddd.tco' starting from zero.
|
||
|
|
*/
|
||
|
|
class CacheIO {
|
||
|
|
public:
|
||
|
|
typedef std::string IDType;
|
||
|
|
|
||
|
|
//! Create a directory for temporary cache objects to save in
|
||
|
|
static void createTemporaryDirectory(std::string& path);
|
||
|
|
|
||
|
|
//! Clean up temporary files
|
||
|
|
static void removeTemporaryDirectory();
|
||
|
|
|
||
|
|
//! Creates a unique Id to use for these functions
|
||
|
|
static IDType getId();
|
||
|
|
|
||
|
|
//! Check if a physical representation of this cache entry exists and returns non-zero size for the data
|
||
|
|
static unsigned int check(IDType& id);
|
||
|
|
|
||
|
|
//! Read from file into the data pointer
|
||
|
|
static void read(IDType& id, char* data);
|
||
|
|
|
||
|
|
//! Write data into a file represented by id
|
||
|
|
static void write(IDType& id, char* data, unsigned int size);
|
||
|
|
private:
|
||
|
|
static std::string path;
|
||
|
|
static unsigned int free_id;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif //CACHE_IO_H
|