101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
#pragma once
|
|
#ifndef MESSMER_BLOCKSTORE_IMPLEMENTATIONS_COMPRESSING_COMPRESSINGBLOCKSTORE_H_
|
|
#define MESSMER_BLOCKSTORE_IMPLEMENTATIONS_COMPRESSING_COMPRESSINGBLOCKSTORE_H_
|
|
|
|
#include "../../interface/BlockStore.h"
|
|
#include "CompressedBlock.h"
|
|
|
|
namespace blockstore {
|
|
namespace compressing {
|
|
|
|
template<class Compressor>
|
|
class CompressingBlockStore final: public BlockStore {
|
|
public:
|
|
CompressingBlockStore(cpputils::unique_ref<BlockStore> baseBlockStore);
|
|
~CompressingBlockStore();
|
|
|
|
BlockId createBlockId() override;
|
|
boost::optional<cpputils::unique_ref<Block>> tryCreate(const BlockId &blockId, cpputils::Data data) override;
|
|
boost::optional<cpputils::unique_ref<Block>> load(const BlockId &blockId) override;
|
|
cpputils::unique_ref<Block> overwrite(const blockstore::BlockId &blockId, cpputils::Data data) override;
|
|
void remove(const BlockId &blockId) override;
|
|
uint64_t numBlocks() const override;
|
|
uint64_t estimateNumFreeBytes() const override;
|
|
uint64_t blockSizeFromPhysicalBlockSize(uint64_t blockSize) const override;
|
|
void forEachBlock(std::function<void (const BlockId &)> callback) const override;
|
|
|
|
private:
|
|
cpputils::unique_ref<BlockStore> _baseBlockStore;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(CompressingBlockStore);
|
|
};
|
|
|
|
template<class Compressor>
|
|
CompressingBlockStore<Compressor>::CompressingBlockStore(cpputils::unique_ref<BlockStore> baseBlockStore)
|
|
: _baseBlockStore(std::move(baseBlockStore)) {
|
|
}
|
|
|
|
template<class Compressor>
|
|
CompressingBlockStore<Compressor>::~CompressingBlockStore() {
|
|
}
|
|
|
|
template<class Compressor>
|
|
BlockId CompressingBlockStore<Compressor>::createBlockId() {
|
|
return _baseBlockStore->createBlockId();
|
|
}
|
|
|
|
template<class Compressor>
|
|
boost::optional<cpputils::unique_ref<Block>> CompressingBlockStore<Compressor>::tryCreate(const BlockId &blockId, cpputils::Data data) {
|
|
auto result = CompressedBlock<Compressor>::TryCreateNew(_baseBlockStore.get(), blockId, std::move(data));
|
|
if (result == boost::none) {
|
|
return boost::none;
|
|
}
|
|
return cpputils::unique_ref<Block>(std::move(*result));
|
|
}
|
|
|
|
template<class Compressor>
|
|
cpputils::unique_ref<Block> CompressingBlockStore<Compressor>::overwrite(const blockstore::BlockId &blockId, cpputils::Data data) {
|
|
return CompressedBlock<Compressor>::Overwrite(_baseBlockStore.get(), blockId, std::move(data));
|
|
}
|
|
|
|
template<class Compressor>
|
|
boost::optional<cpputils::unique_ref<Block>> CompressingBlockStore<Compressor>::load(const BlockId &blockId) {
|
|
auto loaded = _baseBlockStore->load(blockId);
|
|
if (loaded == boost::none) {
|
|
return boost::none;
|
|
}
|
|
return boost::optional<cpputils::unique_ref<Block>>(CompressedBlock<Compressor>::Decompress(std::move(*loaded)));
|
|
}
|
|
|
|
template<class Compressor>
|
|
void CompressingBlockStore<Compressor>::remove(const BlockId &blockId) {
|
|
return _baseBlockStore->remove(blockId);
|
|
}
|
|
|
|
template<class Compressor>
|
|
uint64_t CompressingBlockStore<Compressor>::numBlocks() const {
|
|
return _baseBlockStore->numBlocks();
|
|
}
|
|
|
|
template<class Compressor>
|
|
uint64_t CompressingBlockStore<Compressor>::estimateNumFreeBytes() const {
|
|
return _baseBlockStore->estimateNumFreeBytes();
|
|
}
|
|
|
|
template<class Compressor>
|
|
void CompressingBlockStore<Compressor>::forEachBlock(std::function<void (const BlockId &)> callback) const {
|
|
return _baseBlockStore->forEachBlock(callback);
|
|
}
|
|
|
|
template<class Compressor>
|
|
uint64_t CompressingBlockStore<Compressor>::blockSizeFromPhysicalBlockSize(uint64_t blockSize) const {
|
|
//We probably have more since we're compressing, but we don't know exactly how much.
|
|
//The best we can do is ignore the compression step here.
|
|
return _baseBlockStore->blockSizeFromPhysicalBlockSize(blockSize);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
#endif
|