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1 /*
2  * Copyright (C) 2009 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef TIME_SOURCE_H_
18 
19 #define TIME_SOURCE_H_
20 
21 #include <stdint.h>
22 
23 namespace android {
24 
25 class TimeSource {
26 public:
TimeSource()27     TimeSource() {}
~TimeSource()28     virtual ~TimeSource() {}
29 
30     virtual int64_t getRealTimeUs() = 0;
31 
32 private:
33     TimeSource(const TimeSource &);
34     TimeSource &operator=(const TimeSource &);
35 };
36 
37 class SystemTimeSource : public TimeSource {
38 public:
39     SystemTimeSource();
40 
41     virtual int64_t getRealTimeUs();
42 
43 private:
44     static int64_t GetSystemTimeUs();
45 
46     int64_t mStartTimeUs;
47 };
48 
49 }  // namespace android
50 
51 #endif  // TIME_SOURCE_H_
52