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90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FML_MESSAGE_LOOP_IMPL_H_
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#define FLUTTER_FML_MESSAGE_LOOP_IMPL_H_
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#include <atomic>
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#include <deque>
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#include <map>
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#include <mutex>
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#include <queue>
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#include <utility>
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#include "flutter/fml/closure.h"
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#include "flutter/fml/macros.h"
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#include "flutter/fml/memory/ref_counted.h"
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#include "flutter/fml/message_loop.h"
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#include "flutter/fml/time/time_point.h"
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namespace fml {
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class MessageLoopImpl : public fml::RefCountedThreadSafe<MessageLoopImpl> {
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public:
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static fml::RefPtr<MessageLoopImpl> Create();
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virtual ~MessageLoopImpl();
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virtual void Run() = 0;
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virtual void Terminate() = 0;
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virtual void WakeUp(fml::TimePoint time_point) = 0;
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void PostTask(fml::closure task, fml::TimePoint target_time);
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void AddTaskObserver(intptr_t key, fml::closure callback);
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void RemoveTaskObserver(intptr_t key);
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void DoRun();
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void DoTerminate();
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// Exposed for the embedder shell which allows clients to poll for events
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// instead of dedicating a thread to the message loop.
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void RunExpiredTasksNow();
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protected:
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MessageLoopImpl();
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private:
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struct DelayedTask {
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size_t order;
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fml::closure task;
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fml::TimePoint target_time;
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DelayedTask(size_t p_order,
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fml::closure p_task,
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fml::TimePoint p_target_time)
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: order(p_order), task(std::move(p_task)), target_time(p_target_time) {}
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};
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struct DelayedTaskCompare {
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bool operator()(const DelayedTask& a, const DelayedTask& b) {
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return a.target_time == b.target_time ? a.order > b.order
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: a.target_time > b.target_time;
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}
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};
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using DelayedTaskQueue = std::
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priority_queue<DelayedTask, std::deque<DelayedTask>, DelayedTaskCompare>;
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std::map<intptr_t, fml::closure> task_observers_;
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std::mutex delayed_tasks_mutex_;
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DelayedTaskQueue delayed_tasks_;
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size_t order_;
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std::atomic_bool terminated_;
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void RegisterTask(fml::closure task, fml::TimePoint target_time);
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void RunExpiredTasks();
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FML_DISALLOW_COPY_AND_ASSIGN(MessageLoopImpl);
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};
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} // namespace fml
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#endif // FLUTTER_FML_MESSAGE_LOOP_IMPL_H_
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