109 lines
2.6 KiB
C++
109 lines
2.6 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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#pragma once
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namespace folly {
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template <class T>
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size_t SharedPromise<T>::size() const {
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std::lock_guard<std::mutex> g(mutex_);
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return size_.value;
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}
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template <class T>
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SemiFuture<T> SharedPromise<T>::getSemiFuture() const {
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std::lock_guard<std::mutex> g(mutex_);
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size_.value++;
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if (hasResult()) {
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return makeFuture<T>(Try<T>(try_.value));
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} else {
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promises_.emplace_back();
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if (interruptHandler_) {
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promises_.back().setInterruptHandler(interruptHandler_);
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}
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return promises_.back().getSemiFuture();
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}
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}
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template <class T>
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Future<T> SharedPromise<T>::getFuture() const {
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return getSemiFuture().via(&InlineExecutor::instance());
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}
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template <class T>
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template <class E>
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typename std::enable_if<std::is_base_of<std::exception, E>::value>::type
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SharedPromise<T>::setException(E const& e) {
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setTry(Try<T>(e));
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}
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template <class T>
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void SharedPromise<T>::setException(exception_wrapper ew) {
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setTry(Try<T>(std::move(ew)));
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}
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template <class T>
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void SharedPromise<T>::setInterruptHandler(
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std::function<void(exception_wrapper const&)> fn) {
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std::lock_guard<std::mutex> g(mutex_);
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if (hasResult()) {
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return;
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}
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interruptHandler_ = fn;
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for (auto& p : promises_) {
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p.setInterruptHandler(fn);
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}
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}
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template <class T>
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template <class M>
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void SharedPromise<T>::setValue(M&& v) {
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setTry(Try<T>(std::forward<M>(v)));
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}
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template <class T>
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template <class F>
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void SharedPromise<T>::setWith(F&& func) {
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setTry(makeTryWith(std::forward<F>(func)));
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}
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template <class T>
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void SharedPromise<T>::setTry(Try<T>&& t) {
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std::vector<Promise<T>> promises;
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{
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std::lock_guard<std::mutex> g(mutex_);
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if (hasResult()) {
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throw_exception<PromiseAlreadySatisfied>();
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}
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try_.value = std::move(t);
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promises.swap(promises_);
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}
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for (auto& p : promises) {
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p.setTry(Try<T>(try_.value));
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}
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}
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template <class T>
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bool SharedPromise<T>::isFulfilled() const {
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std::lock_guard<std::mutex> g(mutex_);
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return hasResult();
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}
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} // namespace folly
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