mirror of
https://github.com/kidfromjupiter/nearby.git
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Alexey Polyudov
4baa1ce96a
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: Ie19e006429b138b3768e97dae971a43fdc5ef8bf
109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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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#ifndef PLATFORM_IMPL_G3_SETTABLE_FUTURE_IMPL_H_
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#define PLATFORM_IMPL_G3_SETTABLE_FUTURE_IMPL_H_
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#include <utility>
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#include "platform/api/platform.h"
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#include "platform/api/settable_future.h"
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#include "absl/synchronization/mutex.h"
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#include "absl/time/clock.h"
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#include "absl/types/any.h"
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namespace location {
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namespace nearby {
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namespace platform {
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class SettableFutureImpl : public SettableFuture<absl::any> {
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public:
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explicit SettableFutureImpl() = default;
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~SettableFutureImpl() override = default;
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bool set(absl::any value) override {
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absl::MutexLock lock(&mutex_);
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if (!done_) {
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value_ = std::move(value);
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done_ = true;
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exception_ = {Exception::kSuccess};
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completed_.SignalAll();
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}
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return true;
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}
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bool setException(Exception exception) override {
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absl::MutexLock lock(&mutex_);
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return SetExceptionLocked(exception);
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}
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void addListener(Ptr<Runnable> runnable, Executor* executor) override {}
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ExceptionOr<std::any> get() override {
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absl::MutexLock lock(&mutex_);
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while (!done_) {
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completed_.Wait(&mutex_);
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}
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return exception_.value != Exception::kSuccess
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? ExceptionOr<std::any>{exception_.value}
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: ExceptionOr<std::any>{value_};
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}
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ExceptionOr<std::any> get(std::int64_t timeout_ms) override {
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absl::MutexLock lock(&mutex_);
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absl::Duration timeout = absl::Milliseconds(timeout_ms);
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while (!done_) {
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absl::Time start_time = absl::Now();
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if (completed_.WaitWithTimeout(&mutex_, timeout)) {
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SetExceptionLocked({Exception::kTimeout});
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break;
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}
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absl::Duration spent = absl::Now() - start_time;
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if (spent < timeout) {
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timeout -= spent;
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} else if (!done_) {
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SetExceptionLocked({Exception::kTimeout});
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break;
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}
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}
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return exception_.value != Exception::kSuccess
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? ExceptionOr<std::any>{exception_.value}
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: ExceptionOr<std::any>{value_};
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}
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private:
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bool SetExceptionLocked(Exception exception) {
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if (!done_) {
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exception_ = exception.value != Exception::kSuccess
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? exception
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: Exception{Exception::kFailed};
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done_ = true;
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completed_.SignalAll();
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}
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return true;
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}
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absl::Mutex mutex_;
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absl::CondVar completed_;
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bool done_{false};
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absl::any value_;
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Exception exception_{Exception::kFailed};
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};
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} // namespace platform
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_IMPL_G3_SETTABLE_FUTURE_IMPL_H_
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