| /** |
| * 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 <boost/date_time/local_time/local_time.hpp> |
| #include <atomic> |
| #include <chrono> |
| |
| #include <pulsar/defines.h> |
| |
| namespace pulsar { |
| |
| using namespace boost::posix_time; |
| using boost::posix_time::milliseconds; |
| using boost::posix_time::seconds; |
| |
| class PULSAR_PUBLIC TimeUtils { |
| public: |
| static ptime now(); |
| static int64_t currentTimeMillis(); |
| }; |
| |
| // This class processes a timeout with the following semantics: |
| // > 0: wait at most the timeout until a blocking operation completes |
| // == 0: do not wait the blocking operation |
| // < 0: wait infinitely until a blocking operation completes. |
| // |
| // Here is a simple example usage: |
| // |
| // ```c++ |
| // // Wait at most 300 milliseconds |
| // TimeoutProcessor<std::chrono::milliseconds> timeoutProcessor{300}; |
| // while (!allOperationsAreDone()) { |
| // timeoutProcessor.tik(); |
| // // This method may block for some time |
| // performBlockingOperation(timeoutProcessor.getLeftTimeout()); |
| // timeoutProcessor.tok(); |
| // } |
| // ``` |
| // |
| // The template argument is the same as std::chrono::duration. |
| template <typename Duration> |
| class TimeoutProcessor { |
| public: |
| using Clock = std::chrono::high_resolution_clock; |
| |
| TimeoutProcessor(long timeout) : leftTimeout_(timeout) {} |
| |
| long getLeftTimeout() const noexcept { return leftTimeout_; } |
| |
| void tik() { before_ = Clock::now(); } |
| |
| void tok() { |
| if (leftTimeout_ > 0) { |
| leftTimeout_ -= std::chrono::duration_cast<Duration>(Clock::now() - before_).count(); |
| if (leftTimeout_ <= 0) { |
| // The timeout exceeds, getLeftTimeout() will return 0 to indicate we should not wait more |
| leftTimeout_ = 0; |
| } |
| } |
| } |
| |
| private: |
| std::atomic_long leftTimeout_; |
| std::chrono::time_point<Clock> before_; |
| }; |
| |
| } // namespace pulsar |