| // Copyright 2020 Google LLC |
| // |
| // Licensed 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 |
| // |
| // https://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. |
| |
| #ifndef PLATFORM_PUBLIC_SUBMITTABLE_EXECUTOR_H_ |
| #define PLATFORM_PUBLIC_SUBMITTABLE_EXECUTOR_H_ |
| |
| #include <cstddef> |
| #include <functional> |
| #include <memory> |
| #include <utility> |
| |
| #include "absl/base/thread_annotations.h" |
| #include "internal/platform/implementation/executor.h" |
| #include "internal/platform/implementation/submittable_executor.h" |
| #include "internal/platform/callable.h" |
| #include "internal/platform/runnable.h" |
| #include "internal/platform/future.h" |
| #include "internal/platform/lockable.h" |
| #include "internal/platform/monitored_runnable.h" |
| #include "internal/platform/mutex.h" |
| #include "internal/platform/mutex_lock.h" |
| #include "internal/platform/thread_check_callable.h" |
| #include "internal/platform/thread_check_runnable.h" |
| |
| namespace location { |
| namespace nearby { |
| |
| inline int GetCurrentTid() { return api::GetCurrentTid(); } |
| |
| // Main interface to be used by platform as a base class for |
| // - MultiThreadExecutor |
| // - SingleThreadExecutor |
| class ABSL_LOCKABLE SubmittableExecutor : public api::SubmittableExecutor, |
| public Lockable { |
| public: |
| ~SubmittableExecutor() override { |
| MutexLock lock(&mutex_); |
| DoShutdown(); |
| } |
| SubmittableExecutor(SubmittableExecutor&& other) { *this = std::move(other); } |
| SubmittableExecutor& operator=(SubmittableExecutor&& other) |
| ABSL_LOCKS_EXCLUDED(mutex_) { |
| MutexLock lock(&mutex_); |
| { |
| MutexLock other_lock(&other.mutex_); |
| impl_ = std::move(other.impl_); |
| } |
| return *this; |
| } |
| void Execute(const std::string& name, Runnable&& runnable) |
| ABSL_LOCKS_EXCLUDED(mutex_) { |
| MutexLock lock(&mutex_); |
| if (impl_) |
| impl_->Execute(MonitoredRunnable( |
| name, ThreadCheckRunnable(this, std::move(runnable)))); |
| } |
| |
| void Execute(Runnable&& runnable) ABSL_LOCKS_EXCLUDED(mutex_) override { |
| MutexLock lock(&mutex_); |
| if (impl_) |
| impl_->Execute( |
| MonitoredRunnable(ThreadCheckRunnable(this, std::move(runnable)))); |
| } |
| |
| void Shutdown() ABSL_LOCKS_EXCLUDED(mutex_) override { |
| MutexLock lock(&mutex_); |
| DoShutdown(); |
| } |
| |
| // Submits a callable for execution. |
| // When execution completes, return value is assigned to the passed future. |
| // Future must outlive the whole execution chain. |
| template <typename T> |
| bool Submit(Callable<T>&& callable, Future<T>* future) |
| ABSL_LOCKS_EXCLUDED(mutex_) { |
| MutexLock lock(&mutex_); |
| bool submitted = |
| DoSubmit([callable = ThreadCheckCallable<T>(this, std::move(callable)), |
| future]() { |
| ExceptionOr<T> result = callable(); |
| if (result.ok()) { |
| future->Set(result.result()); |
| } else { |
| future->SetException({result.exception()}); |
| } |
| }); |
| if (!submitted) { |
| // complete immediately with kExecution exception value. |
| future->SetException({Exception::kExecution}); |
| } |
| return submitted; |
| } |
| |
| protected: |
| explicit SubmittableExecutor(std::unique_ptr<api::SubmittableExecutor> impl) |
| : impl_(std::move(impl)) {} |
| |
| private: |
| void DoShutdown() ABSL_EXCLUSIVE_LOCKS_REQUIRED(mutex_) { |
| if (impl_) { |
| impl_->Shutdown(); |
| impl_.reset(); |
| } |
| } |
| // Submit a callable (with no delay). |
| // Returns true, if callable was submitted, false otherwise. |
| // Callable is not submitted if shutdown is in progress. |
| bool DoSubmit(Runnable&& wrapped_callable) |
| ABSL_EXCLUSIVE_LOCKS_REQUIRED(mutex_) override { |
| return impl_ ? impl_->DoSubmit(std::move(wrapped_callable)) : false; |
| } |
| mutable Mutex mutex_; |
| std::unique_ptr<api::SubmittableExecutor> ABSL_GUARDED_BY(mutex_) impl_; |
| }; |
| |
| } // namespace nearby |
| } // namespace location |
| |
| #endif // PLATFORM_PUBLIC_SUBMITTABLE_EXECUTOR_H_ |