Page Speed Optimization Libraries  1.5.27.2
net/instaweb/util/public/countdown_timer.h
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00001 /*
00002  * Copyright 2013 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_COUNTDOWN_TIMER_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_COUNTDOWN_TIMER_H_
00021 
00022 #include <time.h>
00023 #include "net/instaweb/util/public/basictypes.h"
00024 
00025 namespace net_instaweb {
00026 
00027 class Timer;
00028 
00033 class CountdownTimer {
00034  public:
00035   CountdownTimer(Timer* timer,
00036                  void* user_data,
00037                  int64 allowed_time_ms);
00038 
00039   void Reset(int64 allowed_time_ms);
00040 
00041   bool HaveTimeLeft() const;
00042 
00043   void* user_data() const { return user_data_; }
00044 
00045   int64 TimeLeftMs() const;
00046 
00047   int64 TimeElapsedMs() const;
00048 
00049  private:
00050   Timer* timer_;
00051   void* user_data_;
00052   clock_t limit_time_us_;
00053   clock_t start_time_us_;
00054 };
00055 
00056 }  
00057 
00058 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_COUNTDOWN_TIMER_H_
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