Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/timer.h
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00001 /*
00002  * Copyright 2010 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_TIMER_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_TIMER_H_
00021 
00022 #include "net/instaweb/util/public/basictypes.h"
00023 
00024 namespace net_instaweb {
00025 
00027 class Timer {
00028  public:
00034   static const int64 kSecondMs = 1000;
00035   static const int64 kMsUs     = 1000;
00036   static const int64 kSecondUs = kMsUs * kSecondMs;
00037   static const int64 kSecondNs = 1000 * kSecondUs;
00038   static const int64 kMinuteMs =   60 * kSecondMs;
00039   static const int64 kMinuteUs =   60 * kSecondUs;
00040   static const int64 kHourMs   =   60 * kMinuteMs;
00041   static const int64 kDayMs    =   24 * kHourMs;
00042   static const int64 kWeekMs   =    7 * kDayMs;
00043   static const int64 kMonthMs  =   31 * kDayMs;
00044   static const int64 kYearMs   =  365 * kDayMs;
00045 
00046   virtual ~Timer();
00047 
00049   virtual int64 NowMs() const;
00050 
00052   virtual int64 NowUs() const = 0;
00053 
00055   virtual void SleepMs(int64 ms);
00056 
00058   virtual void SleepUs(int64 us) = 0;
00059 };
00060 
00061 }  
00062 
00063 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_TIMER_H_
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