| // Copyright (c) 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROMEOS_COMPONENTS_NEARBY_SCHEDULED_EXECUTOR_IMPL_H_ |
| #define CHROMEOS_COMPONENTS_NEARBY_SCHEDULED_EXECUTOR_IMPL_H_ |
| |
| #include <memory> |
| |
| #include "base/containers/flat_map.h" |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/sequence_checker.h" |
| #include "base/synchronization/lock.h" |
| #include "base/task/post_task.h" |
| #include "base/timer/timer.h" |
| #include "base/unguessable_token.h" |
| #include "chromeos/components/nearby/library/atomic_boolean.h" |
| #include "chromeos/components/nearby/library/cancelable.h" |
| #include "chromeos/components/nearby/library/runnable.h" |
| #include "chromeos/components/nearby/library/scheduled_executor.h" |
| |
| namespace chromeos { |
| |
| namespace nearby { |
| |
| // TODO(kyleqian): Use Ptr once the Nearby library is merged in. |
| // Concrete location::nearby::ScheduledExecutor implementation. |
| class ScheduledExecutorImpl : public location::nearby::ScheduledExecutor { |
| public: |
| ScheduledExecutorImpl( |
| scoped_refptr<base::SequencedTaskRunner> timer_task_runner = |
| base::CreateSequencedTaskRunnerWithTraits(base::MayBlock())); |
| ~ScheduledExecutorImpl() override; |
| |
| private: |
| struct PendingTaskWithTimer { |
| PendingTaskWithTimer(std::shared_ptr<location::nearby::Runnable> runnable, |
| std::unique_ptr<base::OneShotTimer> timer); |
| ~PendingTaskWithTimer(); |
| std::shared_ptr<location::nearby::Runnable> runnable; |
| std::unique_ptr<base::OneShotTimer> timer; |
| }; |
| |
| // Static wrapper that simply runs OnTaskCancelled() if the exector has not |
| // already been destroyed. This is necessary because |
| // base::WeakPtr<ScheduledExecutorImpl> is not allowed to bind to |
| // OnTaskCancelled(), which is non-static and non-void. |
| static bool TryCancelTask(base::WeakPtr<ScheduledExecutorImpl> executor, |
| const base::UnguessableToken& id); |
| |
| // location::nearby::Executor: |
| void shutdown() override; |
| |
| // location::nearby::ScheduledExecutor: |
| std::shared_ptr<location::nearby::Cancelable> schedule( |
| std::shared_ptr<location::nearby::Runnable> runnable, |
| int64_t delay_millis) override; |
| |
| // To ensure thread-safety, these methods are only to be posted as tasks on |
| // |timer_api_task_runner_| so that they execute in the same sequence. |
| void StartTimerWithId(const base::UnguessableToken& id, |
| const base::TimeDelta& delay); |
| void StopTimerWithIdAndDeleteTaskEntry(const base::UnguessableToken& id); |
| |
| void RunTaskWithId(const base::UnguessableToken& id); |
| void RemoveTaskEntryWithId(const base::UnguessableToken& id); |
| bool OnTaskCancelled(const base::UnguessableToken& id); |
| |
| // SequencedTaskRunner that all base::OneShotTimer method calls (e.g. Start() |
| // and Stop()) need to be run on, to ensure thread-safety. This is also where |
| // tasks posted to base::OneShotTimer will run. |
| scoped_refptr<base::SequencedTaskRunner> timer_task_runner_; |
| |
| std::unique_ptr<location::nearby::AtomicBoolean> is_shut_down_; |
| base::Lock map_lock_; |
| base::flat_map<base::UnguessableToken, std::unique_ptr<PendingTaskWithTimer>> |
| id_to_task_map_; |
| SEQUENCE_CHECKER(timer_sequence_checker_); |
| base::WeakPtrFactory<ScheduledExecutorImpl> weak_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScheduledExecutorImpl); |
| }; |
| |
| } // namespace nearby |
| |
| } // namespace chromeos |
| |
| #endif // CHROMEOS_COMPONENTS_NEARBY_SCHEDULED_EXECUTOR_IMPL_H_ |