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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef COMPONENTS_SCHEDULER_RENDERER_LAZY_SCHEDULER_MESSAGE_LOOP_DELEGATE_H_ | |
6 #define COMPONENTS_SCHEDULER_RENDERER_LAZY_SCHEDULER_MESSAGE_LOOP_DELEGATE_H_ | |
7 | |
8 #include "base/message_loop/message_loop.h" | |
9 #include "components/scheduler/child/nestable_single_thread_task_runner.h" | |
10 #include "components/scheduler/scheduler_export.h" | |
11 | |
12 namespace scheduler { | |
13 | |
14 // This class connects the scheduler to a MessageLoop, but unlike | |
15 // SchedulerMessageLoopDelegate it allows the message loop to be created lazily | |
16 // after the scheduler has been brought up. This is needed in testing scenarios | |
17 // where Blink is initialized before a MessageLoop has been created. | |
18 // | |
19 // TODO(skyostil): Fix the relevant test suites and remove this class | |
20 // (crbug.com/495659). | |
21 class SCHEDULER_EXPORT LazySchedulerMessageLoopDelegate | |
rmcilroy
2015/06/02 16:53:07
Maybe we should call this LazySchedulerMessageLoop
Sami
2015/06/02 17:26:20
I thought about that but shied away because the in
| |
22 : public NestableSingleThreadTaskRunner { | |
23 public: | |
24 static scoped_refptr<LazySchedulerMessageLoopDelegate> Create(); | |
25 | |
26 // NestableSingleThreadTaskRunner implementation | |
27 bool PostDelayedTask(const tracked_objects::Location& from_here, | |
28 const base::Closure& task, | |
29 base::TimeDelta delay) override; | |
30 bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here, | |
31 const base::Closure& task, | |
32 base::TimeDelta delay) override; | |
33 bool RunsTasksOnCurrentThread() const override; | |
34 bool IsNested() const override; | |
35 void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer) override; | |
36 void RemoveTaskObserver( | |
37 base::MessageLoop::TaskObserver* task_observer) override; | |
38 | |
39 private: | |
40 LazySchedulerMessageLoopDelegate(); | |
41 ~LazySchedulerMessageLoopDelegate() override; | |
42 | |
43 bool HasMessageLoop() const; | |
44 base::MessageLoop* EnsureMessageLoop() const; | |
45 | |
46 base::PlatformThreadId thread_id_; | |
47 // Task observers which have not yet been registered to a message loop. Not | |
48 // owned. | |
49 mutable base::hash_set<base::MessageLoop::TaskObserver*> pending_observers_; | |
50 | |
51 DISALLOW_COPY_AND_ASSIGN(LazySchedulerMessageLoopDelegate); | |
52 }; | |
53 | |
54 } // namespace scheduler | |
55 | |
56 #endif // COMPONENTS_SCHEDULER_RENDERER_LAZY_SCHEDULER_MESSAGE_LOOP_DELEGATE_H_ | |
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