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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.
84 lines
3.1 KiB
C++
84 lines
3.1 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_DATA_STORE_WRITER_H_
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#define DATA_STORE_DATA_STORE_WRITER_H_
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#include <unordered_set>
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#include "absl/status/statusor.h"
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#include "common/buffer.h"
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#include "data_store/data_store_reader.h"
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#include "manifest/manifest_proto_defs.h"
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namespace cdc_ft {
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// DataStoreWriter is an abstract interface for read/write operations for a data
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// store, for example: a disk-based or in-memory cache.
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class DataStoreWriter : public DataStoreReader {
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public:
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DataStoreWriter() = default;
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DataStoreWriter(const DataStoreWriter&) = delete;
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DataStoreWriter& operator=(const DataStoreWriter&) = delete;
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virtual ~DataStoreWriter() = default;
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// Returns true if the chunk with the given |content_id| is available
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// in the data store. Otherwise, returns false. The default implementation
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// uses Get() to retrieve the chunk and should be overridden.
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virtual bool Contains(const ContentIdProto& content_id);
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// Stores a data chunk |data| of |size| and |content_id| into the data store.
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virtual absl::Status Put(const ContentIdProto& content_id, const void* data,
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size_t size) = 0;
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// Stores the given protocol buffer |proto| as a unique chunk and updates
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// |content_id| with the corresponding digest. If the optional parameter
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// |proto_size| is given, it will be set to the byte size of the serialized
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// proto.
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absl::Status PutProto(const google::protobuf::MessageLite& proto,
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ContentIdProto* content_id,
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size_t* proto_size = nullptr);
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// Removes the data chunk with |content_id| from the writer. Returns success
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// if the chunk does not exist or was removed.
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virtual absl::Status Remove(const ContentIdProto& content_id) = 0;
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// Wipes the data. All statistics and data chunks are removed from the data
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// store.
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virtual absl::Status Wipe() = 0;
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// Removes all chunks except for |ids_to_keep|. Also checks whether all chunks
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// in |ids_to_keep| are present. If not, returns a NotFound error.
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virtual absl::Status Prune(
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std::unordered_set<ContentIdProto> ids_to_keep) = 0;
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// Removes the data if the data store size exceeds its capacity.
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virtual absl::Status Cleanup() { return absl::OkStatus(); }
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// Allows to interrupt methods by setting |interrupt_|.
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void RegisterInterrupt(std::atomic<bool>* interrupt) {
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interrupt_ = interrupt;
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}
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protected:
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// Shows whether a function can be cancelled. Used in Cleanup().
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std::atomic<bool>* interrupt_ = nullptr;
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}; // class DataStoreWriter
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} // namespace cdc_ft
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#endif // DATA_STORE_DATA_STORE_WRITER_H_
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