mirror of https://gitee.com/bigwinds/arangodb
89 lines
3.2 KiB
C++
89 lines
3.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2019 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dan Larkin-York
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_FUNCTION_UTILS_H
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#define ARANGODB_BASICS_FUNCTION_UTILS_H 1
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#include <algorithm>
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#include <chrono>
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#include <functional>
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#include <thread>
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#include <tuple>
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#include "Logger/LogMacros.h"
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namespace arangodb {
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namespace basics {
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namespace function_utils {
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/**
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* @brief Execute a lambda, retrying periodically until it succeeds or times out
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* @param fn Lambda to run
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* @param topic Log topic for any messages
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* @param message Description for log messages (format below)
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* @param retryInterval Period to wait between attempts
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* @param timeout Total time to wait before timing out and returning
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*
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* If a given attempt fails, a log message will be made in the following form:
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* "Failed to " + message + ", waiting to retry..."
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*/
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template <typename R>
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std::pair<bool, R> retryUntilTimeout(
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std::function<std::pair<bool, R>()> fn, LogTopic& topic, std::string const& message,
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std::chrono::nanoseconds retryInterval = std::chrono::seconds(1),
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std::chrono::nanoseconds timeout = std::chrono::minutes(5)) {
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auto start = std::chrono::steady_clock::now();
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bool success = false;
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R value{};
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while ((std::chrono::steady_clock::now() - start) < timeout) {
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std::tie(success, value) = fn();
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if (success) {
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break;
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}
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LOG_TOPIC("18d0a", INFO, topic) << "Failed to " << message << ", waiting to retry...";
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std::this_thread::sleep_for(retryInterval);
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}
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return std::make_pair(success, value);
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}
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/**
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* @brief Execute a lambda, retrying periodically until it succeeds or times out
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* @param fn Lambda to run
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* @param topic Log topic for any messages
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* @param message Description for log messages (format below)
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* @param retryInterval Period to wait between attempts
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* @param timeout Total time to wait before timing out and returning
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*
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* If a given attempt fails, a log message will be made in the following form:
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* "Failed to " + message + ", waiting to retry..."
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*/
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bool retryUntilTimeout(std::function<bool()> fn, LogTopic& topic, std::string const& message,
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std::chrono::nanoseconds retryInterval = std::chrono::seconds(1),
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std::chrono::nanoseconds timeout = std::chrono::minutes(5));
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} // namespace function_utils
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} // namespace basics
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} // namespace arangodb
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#endif
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