| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: jmarantz@google.com (Joshua Marantz) |
| |
| #ifndef PAGESPEED_KERNEL_BASE_TIMER_H_ |
| #define PAGESPEED_KERNEL_BASE_TIMER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| |
| namespace net_instaweb { |
| |
| // Timer interface, made virtual so it can be mocked for tests. |
| class Timer { |
| public: |
| // Note: it's important that these stay compile-time constants, to |
| // avoid weird init order surprises. (Noticed in the wild on Mac). |
| // If you get a link error due to one of these missing, you're trying |
| // to pass it in by a const reference. You can do something like * 1 to |
| // sidestep the issue. |
| static const int64 kSecondMs = 1000; |
| static const int64 kMsUs = 1000; |
| static const int64 kSecondUs = kMsUs * kSecondMs; |
| static const int64 kSecondNs = 1000 * kSecondUs; |
| static const int64 kMinuteMs = 60 * kSecondMs; |
| static const int64 kMinuteUs = 60 * kSecondUs; |
| static const int64 kHourMs = 60 * kMinuteMs; |
| static const int64 kDayMs = 24 * kHourMs; |
| static const int64 kWeekMs = 7 * kDayMs; |
| static const int64 kMonthMs = 31 * kDayMs; |
| static const int64 kYearMs = 365 * kDayMs; |
| |
| virtual ~Timer(); |
| |
| // Returns number of milliseconds since 1970. |
| virtual int64 NowMs() const; |
| |
| // Returns number of microseconds since 1970. |
| virtual int64 NowUs() const = 0; |
| |
| // Sleep for given number of milliseconds. |
| virtual void SleepMs(int64 ms); |
| |
| // Sleep for given number of microseconds. |
| virtual void SleepUs(int64 us) = 0; |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_BASE_TIMER_H_ |