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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.
62 lines
1.8 KiB
C++
62 lines
1.8 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_CLOCK_H_
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#define COMMON_CLOCK_H_
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#include <chrono>
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#include <string>
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namespace cdc_ft {
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// Clock that never runs backwards. Useful for stopwatch etc.
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class SteadyClock {
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public:
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using Timestamp = std::chrono::time_point<std::chrono::steady_clock>;
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virtual ~SteadyClock() = default;
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virtual Timestamp Now() const = 0;
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};
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class DefaultSteadyClock : public SteadyClock {
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public:
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static DefaultSteadyClock* GetInstance();
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Timestamp Now() const override;
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};
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// Clock that matches the system's clock.
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class SystemClock {
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public:
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using Timestamp = std::chrono::time_point<std::chrono::system_clock>;
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virtual ~SystemClock() = default;
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virtual Timestamp Now() const = 0;
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// Formats the current timestamp. |format| is the format according to the
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// std::put_time specification, see
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// https://en.cppreference.com/w/cpp/io/manip/put_time.
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// If |append_millis| is true, appends the milliseconds formatted as %03i.
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std::string FormatNow(const char* format, bool append_millis) const;
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};
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class DefaultSystemClock : public SystemClock {
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public:
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static DefaultSystemClock* GetInstance();
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Timestamp Now() const override;
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};
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} // namespace cdc_ft
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#endif // COMMON_CLOCK_H_
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