// 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. // Author: Ge,Jun (gejun@baidu.com) // Date: Fri Jul 14 11:29:21 CST 2017 #ifndef BVAR_SCOPED_TIMER_H #define BVAR_SCOPED_TIMER_H #include "butil/time.h" // Accumulate microseconds spent by scopes into bvar, useful for debugging. // Example: // bvar::Adder<int64_t> g_function1_spent; // ... // void function1() { // // time cost by function1() will be sent to g_spent_time when // // the function returns. // bvar::ScopedTimer tm(g_function1_spent); // ... // } // To check how many microseconds the function spend in last second, you // can wrap the bvar within PerSecond and make it viewable from /vars // bvar::PerSecond<bvar::Adder<int64_t> > g_function1_spent_second( // "function1_spent_second", &g_function1_spent); namespace bvar{ template <typename T> class ScopedTimer { public: explicit ScopedTimer(T& bvar) : _start_time(butil::cpuwide_time_us()), _bvar(&bvar) {} ~ScopedTimer() { *_bvar << (butil::cpuwide_time_us() - _start_time); } void reset() { _start_time = butil::cpuwide_time_us(); } private: DISALLOW_COPY_AND_ASSIGN(ScopedTimer); const int64_t _start_time; T* _bvar; }; } // namespace bvar #endif //BVAR_SCOPED_TIMER_H