/Users/deen/code/yugabyte-db/src/yb/server/skewed_clock.h
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1 | | // Copyright (c) YugaByte, Inc. |
2 | | // |
3 | | // Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
4 | | // in compliance with the License. You may obtain a copy of the License at |
5 | | // |
6 | | // http://www.apache.org/licenses/LICENSE-2.0 |
7 | | // |
8 | | // Unless required by applicable law or agreed to in writing, software distributed under the License |
9 | | // is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
10 | | // or implied. See the License for the specific language governing permissions and limitations |
11 | | // under the License. |
12 | | // |
13 | | |
14 | | #ifndef YB_SERVER_SKEWED_CLOCK_H |
15 | | #define YB_SERVER_SKEWED_CLOCK_H |
16 | | |
17 | | #include <atomic> |
18 | | #include <chrono> |
19 | | |
20 | | #include "yb/util/physical_time.h" |
21 | | |
22 | | namespace yb { |
23 | | namespace server { |
24 | | |
25 | | class SkewedClock : public PhysicalClock { |
26 | | public: |
27 | | typedef std::chrono::microseconds DeltaTime; |
28 | | |
29 | | static const std::string kName; |
30 | | |
31 | | explicit SkewedClock(PhysicalClockPtr clock); |
32 | | |
33 | | template <class Duration> |
34 | 2 | DeltaTime SetDelta(Duration duration) { |
35 | 2 | return SetDelta(std::chrono::duration_cast<DeltaTime>(duration)); |
36 | 2 | } |
37 | | |
38 | | DeltaTime SetDelta(DeltaTime new_delta); |
39 | | |
40 | | static void Register(); |
41 | | |
42 | | private: |
43 | | Result<PhysicalTime> Now() override; |
44 | | MicrosTime MaxGlobalTime(PhysicalTime time) override; |
45 | | |
46 | | PhysicalClockPtr impl_; |
47 | | std::atomic<DeltaTime> delta_{DeltaTime()}; |
48 | | }; |
49 | | |
50 | | typedef std::shared_ptr<SkewedClock> SkewedClockPtr; |
51 | | |
52 | | class SkewedClockDeltaChanger { |
53 | | public: |
54 | | template <class Delta> |
55 | | SkewedClockDeltaChanger(Delta new_delta, SkewedClockPtr skewed_clock) |
56 | 0 | : skewed_clock_(skewed_clock), old_delta_(skewed_clock->SetDelta(new_delta)) { |
57 | 0 | } |
58 | | |
59 | | SkewedClockDeltaChanger(SkewedClockDeltaChanger&& rhs); |
60 | | |
61 | | SkewedClockDeltaChanger(const SkewedClockDeltaChanger&) = delete; |
62 | | void operator=(const SkewedClockDeltaChanger&) = delete; |
63 | | |
64 | | ~SkewedClockDeltaChanger(); |
65 | | |
66 | | private: |
67 | | SkewedClockPtr skewed_clock_; |
68 | | SkewedClock::DeltaTime old_delta_; |
69 | | }; |
70 | | |
71 | | } // namespace server |
72 | | } // namespace yb |
73 | | |
74 | | #endif // YB_SERVER_SKEWED_CLOCK_H |