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https://github.com/nestriness/cdc-file-transfer.git
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4326e972ac
The tools allow efficient and fast synchronization of large directory trees from a Windows workstation to a Linux target machine. cdc_rsync* support efficient copy of files by using content-defined chunking (CDC) to identify chunks within files that can be reused. asset_stream_manager + cdc_fuse_fs support efficient streaming of a local directory to a remote virtual file system based on FUSE. It also employs CDC to identify and reuse unchanged data chunks.
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
/*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef DATA_STORE_MEM_DATA_STORE_H_
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#define DATA_STORE_MEM_DATA_STORE_H_
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#include <string>
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#include <vector>
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#include "data_store/data_store_writer.h"
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#include "manifest/content_id.h"
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namespace cdc_ft {
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// In-memory implementation of a DataStoreWriter. Data needs to be pre-
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// populated manually using AddData() and AddProto(). Useful for testing.
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class MemDataStore : public DataStoreWriter {
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public:
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using ChunkMap = std::unordered_map<ContentIdProto, std::vector<char>>;
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MemDataStore();
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MemDataStore(const MemDataStore&) = delete;
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MemDataStore& operator=(const MemDataStore&) = delete;
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virtual ~MemDataStore();
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// TODO: Extract AddData in a helper function.
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// Adds |data| to the memory-backed storage and returns the id to it.
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ContentIdProto AddData(std::vector<char> data);
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// TODO: Extract AddProto in a helper function.
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// Serializes |message|, adds it to the memory-backed storage, and returns the
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// id to it.
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ContentIdProto AddProto(const google::protobuf::MessageLite& message);
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// Note: DO NOT MIX Add* get Get* methods in a multi-threaded environment!
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// Get* methods are thread-safe as they are read-only, but Add* methods write
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// to the data. They are not thread-safe.
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// DataStoreReader:
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absl::StatusOr<size_t> Get(const ContentIdProto& id, void* data,
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size_t offset, size_t size) override;
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absl::Status Get(const ContentIdProto& content_id, Buffer* data) override;
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absl::Status Get(ChunkTransferList* chunks) override;
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// DataStoreWriter:
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bool Contains(const ContentIdProto& content_id) override;
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absl::Status Put(const ContentIdProto& content_id, const void* data,
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size_t size) override;
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absl::Status Remove(const ContentIdProto& content_id) override;
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absl::Status Wipe() override;
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absl::Status Prune(std::unordered_set<ContentIdProto> ids_to_keep) override;
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// Direct access to the chunks for testing.
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const ChunkMap& Chunks() const { return data_lookup_; }
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ChunkMap& Chunks() { return data_lookup_; }
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private:
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// Maps content IDs to chunks.
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ChunkMap data_lookup_;
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};
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} // namespace cdc_ft
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#endif // DATA_STORE_MEM_DATA_STORE_H_
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