| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| #pragma once |
| |
| #include <mutex> |
| |
| #include "kudu/util/monotime.h" |
| #include "kudu/util/locks.h" |
| |
| namespace kudu { |
| |
| // Using this class we can keep measure how long something took to run. |
| // Use the Start() and Stop() to start the stop the timer and TimeElapsed() |
| // to get the time taken to run and if still running, time elapsed until that point |
| class Timer { |
| |
| public: |
| Timer() |
| : start_time_(MonoTime::Min()), |
| end_time_(MonoTime::Min()) { |
| } |
| |
| void Start() { |
| if (start_time_ == MonoTime::Min()) { |
| start_time_ = MonoTime::Now(); |
| } |
| } |
| |
| void Stop() { |
| DCHECK_NE(start_time_, MonoTime::Min()); |
| end_time_ = MonoTime::Now(); |
| } |
| |
| MonoDelta TimeElapsed() const { |
| if (start_time_ == MonoTime::Min() && end_time_ == MonoTime::Min()) { |
| return MonoDelta::FromSeconds(0); |
| } |
| if (end_time_ == MonoTime::Min()) { |
| return (MonoTime::Now() - start_time_); |
| } |
| return (end_time_ - start_time_); |
| } |
| |
| bool IsStopped() const { |
| return (end_time_ != MonoTime::Min()); |
| } |
| |
| private: |
| std::atomic<MonoTime> start_time_; |
| std::atomic<MonoTime> end_time_; |
| }; |
| |
| } // namespace kudu |