56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
#pragma once
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#ifndef MESSMER_BLOCKSTORE_INTERFACE_BLOCKSTORE_H_
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#define MESSMER_BLOCKSTORE_INTERFACE_BLOCKSTORE_H_
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#include "Block.h"
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#include <string>
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#include <boost/optional.hpp>
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#include <cpp-utils/pointer/unique_ref.h>
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#include <cpp-utils/data/Data.h>
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namespace blockstore {
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class BlockStore {
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public:
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virtual ~BlockStore() {}
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virtual BlockId createBlockId() = 0;
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//Returns boost::none if id already exists
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// TODO Can we make data passed in by ref?
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virtual boost::optional<cpputils::unique_ref<Block>> tryCreate(const BlockId &blockId, cpputils::Data data) = 0;
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//TODO Use boost::optional (if id doesn't exist)
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// Return nullptr if block with this id doesn't exists
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virtual boost::optional<cpputils::unique_ref<Block>> load(const BlockId &blockId) = 0;
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virtual cpputils::unique_ref<Block> overwrite(const blockstore::BlockId &blockId, cpputils::Data data) = 0;
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virtual void remove(const BlockId &blockId) = 0;
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virtual uint64_t numBlocks() const = 0;
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//TODO Test estimateNumFreeBytes in all block stores
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virtual uint64_t estimateNumFreeBytes() const = 0;
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// Returns, how much space a block has if we allow it to take the given physical block size (i.e. after removing headers, checksums, whatever else).
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// This can be used to create blocks with a certain physical block size.
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virtual uint64_t blockSizeFromPhysicalBlockSize(uint64_t blockSize) const = 0; // TODO Test
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virtual void forEachBlock(std::function<void (const BlockId &)> callback) const = 0;
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virtual void remove(cpputils::unique_ref<Block> block) {
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const BlockId blockId = block->blockId();
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cpputils::destruct(std::move(block));
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remove(blockId);
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}
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cpputils::unique_ref<Block> create(const cpputils::Data &data) {
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while(true) {
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//TODO Copy (data.copy()) necessary?
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auto block = tryCreate(createBlockId(), data.copy());
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if (block != boost::none) {
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return std::move(*block);
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}
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}
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}
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};
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}
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#endif
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