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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.
53 lines
1.6 KiB
C++
53 lines
1.6 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 COMMON_THREAD_SAFE_MAP_H_
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#define COMMON_THREAD_SAFE_MAP_H_
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#include <unordered_map>
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#include "absl/synchronization/mutex.h"
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namespace cdc_ft {
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// A map with keys of type |key_type| and values of type |mapped_type|.
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template <class key_type, class mapped_type>
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class ThreadSafeMap {
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public:
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// Returns a value by the |key|. If the |key| is not present,
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// returns a default value of the `mapped_type`.
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mapped_type Get(const key_type& key) const ABSL_LOCKS_EXCLUDED(mutex_) {
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absl::ReaderMutexLock lock(&mutex_);
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auto it = kv_.find(key);
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return it == kv_.end() ? mapped_type() : it->second;
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}
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// Sets |value| to |key|.
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void Set(const key_type& key, const mapped_type& value)
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ABSL_LOCKS_EXCLUDED(mutex_) {
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absl::WriterMutexLock lock(&mutex_);
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kv_[key] = value;
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}
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private:
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mutable absl::Mutex mutex_;
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std::unordered_map<key_type, mapped_type> kv_ ABSL_GUARDED_BY(mutex_);
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};
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} // namespace cdc_ft
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#endif // COMMON_THREAD_SAFE_MAP_H_
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