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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| /** | ||
| * Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS) | ||
| * | ||
| * This file is part of libbitcoin. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| #ifndef LIBBITCOIN_NETWORK_ASYNC_RACE_UNITY_HPP | ||
| #define LIBBITCOIN_NETWORK_ASYNC_RACE_UNITY_HPP | ||
|
|
||
| #include <memory> | ||
| #include <tuple> | ||
| #include <utility> | ||
| #include <bitcoin/system.hpp> | ||
| #include <bitcoin/network/define.hpp> | ||
|
|
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| namespace libbitcoin { | ||
| namespace network { | ||
|
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| /// Not thread safe. | ||
| /// Used in node validation chaser to invoke upon complete, with first error. | ||
| /// race_unity invokes complete(args) provided at start(complete), with args | ||
| /// from first failed call to finish(args), with failure determined by first | ||
| /// argument in 'args', at the last expected invocation of finish(...), based | ||
| /// on the constructor 'size' parameter. | ||
| template <typename... Args> | ||
| class race_unity final | ||
| { | ||
| public: | ||
| typedef std::shared_ptr<race_unity> ptr; | ||
| typedef std::function<void(Args...)> handler; | ||
|
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| DELETE_COPY_MOVE(race_unity); | ||
|
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| race_unity(size_t size) NOEXCEPT; | ||
| ~race_unity() NOEXCEPT; | ||
|
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| /// True if the race_unity is running. | ||
| inline bool running() const NOEXCEPT; | ||
|
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| /// False implies invalid usage. | ||
| bool start(handler&& complete) NOEXCEPT; | ||
|
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| /// True implies winning finisher (last invocation, none failed). | ||
| /// First arg is an 'error code', cast to bool (failed if true). | ||
| /// There may be no winner, in which case last finish is invoked. | ||
| bool finish(const Args&... args) NOEXCEPT; | ||
|
|
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| private: | ||
| template <size_t... Pack> | ||
| using unpack = std::index_sequence<Pack...>; | ||
| using packed = std::tuple<std::decay_t<Args>...>; | ||
| using sequence = std::index_sequence_for<Args...>; | ||
|
|
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| template<size_t... Index> | ||
| void invoker(const handler& complete, const packed& args, | ||
| unpack<Index...>) NOEXCEPT; | ||
| bool invoke() NOEXCEPT; | ||
| bool set_failure(bool failure) NOEXCEPT; | ||
|
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| // This is thread safe. | ||
| const size_t size_; | ||
|
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| // These are not thread safe. | ||
| packed args_{}; | ||
| bool failure_{}; | ||
| size_t runners_{}; | ||
| std::shared_ptr<handler> complete_{}; | ||
| }; | ||
|
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| } // namespace network | ||
| } // namespace libbitcoin | ||
|
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| #include <bitcoin/network/impl/async/race_unity.ipp> | ||
|
|
||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| /** | ||
| * Copyright (c) 2011-2023 libbitcoin developers (see AUTHORS) | ||
| * | ||
| * This file is part of libbitcoin. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
| #ifndef LIBBITCOIN_NETWORK_ASYNC_RACE_UNITY_IPP | ||
| #define LIBBITCOIN_NETWORK_ASYNC_RACE_UNITY_IPP | ||
|
|
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| #include <memory> | ||
| #include <tuple> | ||
| #include <utility> | ||
| #include <bitcoin/system.hpp> | ||
| #include <bitcoin/network/define.hpp> | ||
|
|
||
| namespace libbitcoin { | ||
| namespace network { | ||
|
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| template <typename... Args> | ||
| race_unity<Args...>:: | ||
| race_unity(size_t size) NOEXCEPT | ||
| : size_(size) | ||
| { | ||
| } | ||
|
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||
| template <typename... Args> | ||
| race_unity<Args...>:: | ||
| ~race_unity() NOEXCEPT | ||
| { | ||
| BC_ASSERT_MSG(!running() && !complete_, "deleting running race_unity"); | ||
| } | ||
|
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||
| template <typename... Args> | ||
| inline bool race_unity<Args...>:: | ||
| running() const NOEXCEPT | ||
| { | ||
| return to_bool(runners_); | ||
| } | ||
|
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| template <typename... Args> | ||
| bool race_unity<Args...>:: | ||
| start(handler&& complete) NOEXCEPT | ||
| { | ||
| // false implies logic error. | ||
| if (running()) | ||
| return false; | ||
|
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| BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT) | ||
| complete_ = std::make_shared<handler>(std::forward<handler>(complete)); | ||
| BC_POP_WARNING() | ||
|
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| failure_ = false; | ||
| runners_ = size_; | ||
| return true; | ||
| } | ||
|
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| template <typename... Args> | ||
| bool race_unity<Args...>:: | ||
| finish(const Args&... args) NOEXCEPT | ||
| { | ||
| // false implies logic error. | ||
| if (!running()) | ||
| return false; | ||
|
|
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| // First argument (by convention) determines failure. | ||
| // Capture parameter pack as tuple of copied arguments. | ||
| auto values = std::tuple<Args...>(args...); | ||
| const auto& ec = std::get<0>(values); | ||
| const auto failer = set_failure(!!ec); | ||
|
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| // Save args for failer (first failure) or last success. | ||
| const auto last = (runners_ == one); | ||
| if (failer || (last && !failure_)) | ||
| args_ = std::move(values); | ||
|
|
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| // false invoke implies logic error. | ||
| return invoke() && last && !failure_; | ||
| } | ||
|
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| // private | ||
| // ---------------------------------------------------------------------------- | ||
|
|
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| template <typename... Args> | ||
| bool race_unity<Args...>:: | ||
| set_failure(bool failure) NOEXCEPT | ||
| { | ||
| // Return is failer (first to fail) and set failure. | ||
| failure &= !failure_; | ||
| failure_ |= failure; | ||
| return failure; | ||
| } | ||
|
|
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| template <typename... Args> | ||
| bool race_unity<Args...>:: | ||
| invoke() NOEXCEPT | ||
| { | ||
| // false implies logic error. | ||
| if (!running()) | ||
| return false; | ||
|
|
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| --runners_; | ||
| if (running()) | ||
| return true; | ||
|
|
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| // false implies logic error. | ||
| if (!complete_) | ||
| return false; | ||
|
|
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| // Invoke completion handler. | ||
| invoker(*complete_, args_, sequence{}); | ||
|
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| // Clear all resources. | ||
| complete_.reset(); | ||
| args_ = {}; | ||
| return true; | ||
| } | ||
|
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| template <typename... Args> | ||
| template<size_t... Index> | ||
| void race_unity<Args...>:: | ||
| invoker(const handler& complete, const packed& args, unpack<Index...>) NOEXCEPT | ||
| { | ||
| // Expand tuple into parameter pack. | ||
| complete(std::get<Index>(args)...); | ||
| } | ||
|
|
||
| } // namespace network | ||
| } // namespace libbitcoin | ||
|
|
||
| #endif |
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