| // Copyright 2022 The Pigweed Authors |
| // |
| // 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. |
| #pragma once |
| |
| #include "pw_async/task.h" |
| |
| namespace pw::async { |
| |
| // Asynchronous Dispatcher abstract class. A default implementation is provided |
| // in dispatcher_basic.h. |
| class Dispatcher { |
| public: |
| virtual ~Dispatcher() = default; |
| |
| virtual void RequestStop() = 0; |
| |
| // Returns the current time as viewed by the Dispatcher. |
| virtual chrono::SystemClock::time_point Now() = 0; |
| |
| // Post caller owned |task|. |
| virtual void PostTask(Task& task) = 0; |
| |
| // Post caller owned |task| to be run after |delay|. |
| virtual void PostDelayedTask(Task& task, |
| chrono::SystemClock::duration delay) = 0; |
| |
| // Post caller owned |task| to be run at |time|. |
| virtual void PostTaskForTime(Task& task, |
| chrono::SystemClock::time_point time) = 0; |
| |
| // Post caller owned |task| to be run immediately then rerun at a regular |
| // |interval|. |
| virtual void SchedulePeriodicTask(Task& task, |
| chrono::SystemClock::duration interval) = 0; |
| // Post caller owned |task| to be run at |start_time| then rerun at a regular |
| // |interval|. |
| virtual void SchedulePeriodicTask( |
| Task& task, |
| chrono::SystemClock::duration interval, |
| chrono::SystemClock::time_point start_time) = 0; |
| |
| // Returns true if |task| is succesfully canceled. |
| // If cancelation fails, the task may be running or completed. |
| // Periodic tasks may be posted once more after they are canceled. |
| virtual bool Cancel(Task& task) = 0; |
| |
| // Execute tasks until the Dispatcher enters a state where none are queued. |
| virtual void RunUntilIdle() = 0; |
| |
| // Run the Dispatcher until Now() has reached `end_time`, executing all tasks |
| // that come due before then. |
| virtual void RunUntil(chrono::SystemClock::time_point end_time) = 0; |
| |
| // Run the Dispatcher until `duration` has elapsed, executing all tasks that |
| // come due in that period. |
| virtual void RunFor(chrono::SystemClock::duration duration) = 0; |
| }; |
| |
| } // namespace pw::async |