libcryfs/interface/BlockStore.h

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#pragma once
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#ifndef MESSMER_BLOCKSTORE_INTERFACE_BLOCKSTORE_H_
#define MESSMER_BLOCKSTORE_INTERFACE_BLOCKSTORE_H_
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#include "Block.h"
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#include <string>
#include <boost/optional.hpp>
#include <messmer/cpp-utils/pointer/unique_ref.h>
#include <messmer/cpp-utils/data/Data.h>
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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;
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//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;
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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);
}
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}
}
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};
}
#endif