/Users/deen/code/yugabyte-db/src/yb/util/physical_time.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_UTIL_PHYSICAL_TIME_H |
15 | | #define YB_UTIL_PHYSICAL_TIME_H |
16 | | |
17 | | #include <functional> // For std::function |
18 | | #include <memory> |
19 | | |
20 | | #include <boost/atomic.hpp> |
21 | | |
22 | | #include "yb/util/status_fwd.h" |
23 | | |
24 | | namespace yb { |
25 | | |
26 | | using MicrosTime = uint64_t; |
27 | | |
28 | | struct PhysicalTime { |
29 | | MicrosTime time_point; |
30 | | MicrosTime max_error; |
31 | | |
32 | | std::string ToString() const; |
33 | | }; |
34 | | |
35 | | class PhysicalClock { |
36 | | public: |
37 | | virtual Result<PhysicalTime> Now() = 0; |
38 | | virtual MicrosTime MaxGlobalTime(PhysicalTime time) = 0; |
39 | 6.34k | virtual ~PhysicalClock() {} |
40 | | }; |
41 | | |
42 | | typedef std::shared_ptr<PhysicalClock> PhysicalClockPtr; |
43 | | typedef std::function<PhysicalClockPtr(const std::string&)> PhysicalClockProvider; |
44 | | |
45 | | // Clock with user controlled return values. |
46 | | class MockClock : public PhysicalClock { |
47 | | public: |
48 | | Result<PhysicalTime> Now() override; |
49 | | |
50 | 2 | MicrosTime MaxGlobalTime(PhysicalTime time) override { |
51 | 2 | return time.time_point; |
52 | 2 | } |
53 | | |
54 | | void Set(const PhysicalTime& value); |
55 | | |
56 | | // Constructs PhysicalClockPtr from this object. |
57 | | PhysicalClockPtr AsClock(); |
58 | | |
59 | | // Constructs PhysicalClockProvider from this object. |
60 | | PhysicalClockProvider AsProvider(); |
61 | | |
62 | | private: |
63 | | // Set by calls to SetMockClockWallTimeForTests(). |
64 | | // For testing purposes only. |
65 | | boost::atomic<PhysicalTime> value_{{0, 0}}; |
66 | | }; |
67 | | |
68 | | const PhysicalClockPtr& WallClock(); |
69 | | |
70 | | #if !defined(__APPLE__) |
71 | | const PhysicalClockPtr& AdjTimeClock(); |
72 | | #endif |
73 | | |
74 | | } // namespace yb |
75 | | |
76 | | #endif // YB_UTIL_PHYSICAL_TIME_H |