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write create snap shot

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This commit is contained in:
happyZYM
2024-05-04 14:33:12 +00:00
parent 6af4d88535
commit c59775c184
6 changed files with 152 additions and 2 deletions
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35
dataguard/include/dataguard/snapshot.h
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@ -5,14 +5,28 @@
#include "storage/driver.h"
#include "vector.hpp"
void GenerateDiff(const std::string &old_file, const std::string &new_file, const std::string &diff_file);
void ApplyPatch(const std::string &old_file, const std::string &diff_file, const std::string &new_file, bool is_reverse);
void ApplyPatch(const std::string &old_file, const std::string &diff_file, const std::string &new_file,
bool is_reverse);
/**
* @brief SnapShotManager is a class to manage the snapshot of the data drivers.
*/
/**
The structure of the meta file is as follows:
[HEAD]
[ID1] [Anc1]
...
*/
class SnapShotManager {
bool has_connected = false;
bool has_set_meta_file = false;
sjtu::vector<DataDriverBase *> drivers;
std::string meta_file;
public:
// For safety and simplicity, we delete all the copy/move constructor and copy/move assignment operator. Please
// manager it using smart pointer.
SnapShotManager() = default;
SnapShotManager(const SnapShotManager &) = delete;
SnapShotManager(SnapShotManager &&) = delete;
SnapShotManager &operator=(const SnapShotManager &) = delete;
@ -28,5 +42,24 @@ class SnapShotManager {
drivers = std::move(drivers_);
has_connected = true;
}
inline void SetMetaFile(const std::string &meta_file_) {
if (has_set_meta_file) throw std::runtime_error("SnapShotManager has already set the meta file");
has_set_meta_file = true;
meta_file = meta_file_;
// check if the file exists
FILE *f = fopen(meta_file.c_str(), "r");
if (f == nullptr) {
if (!has_connected)
throw std::runtime_error(
"SnapShotManager has not connected to the data drivers before initializing the repository");
InitializeRepository();
} else {
fclose(f);
}
}
void InitializeRepository();
void CreateSnapShot(const std::string &snap_shot_ID);
void SwitchToSnapShot(const std::string &snap_shot_ID);
void RemoveSnapShot(const std::string &snap_shot_ID);
};
#endif // SNAP_SHOT_H