148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
|
/*
|
||
|
|
----
|
||
|
|
This file is part of SECONDO.
|
||
|
|
Realizing a simple distributed filesystem for master thesis of stephan scheide
|
||
|
|
|
||
|
|
Copyright (C) 2015,
|
||
|
|
Faculty of Mathematics and Computer Science,
|
||
|
|
Database Systems for New Applications.
|
||
|
|
|
||
|
|
SECONDO is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 2 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
SECONDO is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with SECONDO; if not, write to the Free Software
|
||
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
----
|
||
|
|
|
||
|
|
|
||
|
|
//[$][\$]
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef STATE_H
|
||
|
|
#define STATE_H
|
||
|
|
|
||
|
|
#include "../shared/str.h"
|
||
|
|
#include "../shared/FigureSystem.h"
|
||
|
|
#include "Chunk.h"
|
||
|
|
|
||
|
|
const short CHUNK_ALLOC = 128;
|
||
|
|
|
||
|
|
namespace dfs {
|
||
|
|
|
||
|
|
class State {
|
||
|
|
public:
|
||
|
|
State();
|
||
|
|
|
||
|
|
virtual ~State();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns amount of chunks within the data node
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
int getChunksLength() { return chunksLength; }
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns list of chunks
|
||
|
|
* do not modify!
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
Chunk *getChunkList() { return chunks; }
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns next free chunk
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
Chunk *nextChunk();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* created deep copy of state
|
||
|
|
* memory need to be freed by caller
|
||
|
|
*/
|
||
|
|
Chunk *copyState(int *outLength);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns a chunk by id
|
||
|
|
* @param name
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
Chunk *findChunkByName(const Str &name);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* deletes chunk by id
|
||
|
|
* if not found, nothing happens
|
||
|
|
* @param id
|
||
|
|
*/
|
||
|
|
void deleteChunkById(const Str &id);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* deletes all chunks and reorganized internal structures like
|
||
|
|
* on a new data node
|
||
|
|
*/
|
||
|
|
void deleteAllChunks();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns chunk by the index within the internal list
|
||
|
|
* @param index
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
Chunk *findChunkByIndex(int index);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* indicates whether dirty
|
||
|
|
* if read out, dirty is unset
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
bool dirtyToggle() {
|
||
|
|
bool b = isDirty;
|
||
|
|
if (b) isDirty = false;
|
||
|
|
return b;
|
||
|
|
}
|
||
|
|
|
||
|
|
void markAsDirty() { isDirty = true; };
|
||
|
|
|
||
|
|
/*
|
||
|
|
* dumps state to file
|
||
|
|
* @param filename
|
||
|
|
*/
|
||
|
|
void dumpToFile(const Str &filename);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* restores state from file
|
||
|
|
* @param filename
|
||
|
|
*/
|
||
|
|
void restoreFromFile(const Str &filename);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns amount of used chunks in this data node
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
int usedChunkCount();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* returns size of all chunks
|
||
|
|
* @return
|
||
|
|
*/
|
||
|
|
UI64 sizeOfAllChunks();
|
||
|
|
|
||
|
|
private:
|
||
|
|
FigureSystem *fsc;
|
||
|
|
int nextChunkIndex;
|
||
|
|
bool isDirty;
|
||
|
|
Chunk *chunks;
|
||
|
|
int chunksLength;
|
||
|
|
|
||
|
|
void reset();
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* STATE_H */
|