libcryfs/interface/BlockStore.h
2015-10-15 13:09:21 +02:00

40 lines
1.1 KiB
C++

#pragma once
#ifndef MESSMER_BLOCKSTORE_INTERFACE_BLOCKSTORE_H_
#define MESSMER_BLOCKSTORE_INTERFACE_BLOCKSTORE_H_
#include "Block.h"
#include <string>
#include <boost/optional.hpp>
#include <messmer/cpp-utils/pointer/unique_ref.h>
#include <messmer/cpp-utils/data/Data.h>
namespace blockstore {
class BlockStore {
public:
virtual ~BlockStore() {}
virtual Key createKey() = 0;
//Returns boost::none if key already exists
virtual boost::optional<cpputils::unique_ref<Block>> tryCreate(const Key &key, cpputils::Data data) = 0;
//TODO Use boost::optional (if key doesn't exist)
// Return nullptr if block with this key doesn't exists
virtual boost::optional<cpputils::unique_ref<Block>> load(const Key &key) = 0;
virtual void remove(cpputils::unique_ref<Block> block) = 0;
virtual uint64_t numBlocks() const = 0;
cpputils::unique_ref<Block> create(const cpputils::Data &data) {
while(true) {
//TODO Copy (data.copy()) necessary?
auto block = tryCreate(createKey(), data.copy());
if (block != boost::none) {
return std::move(*block);
}
}
}
};
}
#endif