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1 // Copyright 2014 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 #include "chrome/browser/safe_browsing/delayed_callback_runner.h" | |
6 | |
7 #include "base/location.h" | |
8 #include "base/single_thread_task_runner.h" | |
9 #include "base/thread_task_runner_handle.h" | |
10 | |
11 namespace { | |
12 | |
13 // Runs |callback| on the thread to which |thread_runner| belongs. The callback | |
14 // is run immediately if this function is called on |thread_runner|'s thread. | |
15 void RunCallbackOnOriginThread( | |
16 const base::Closure& callback, | |
17 scoped_refptr<base::SingleThreadTaskRunner> thread_runner) { | |
18 if (thread_runner->BelongsToCurrentThread()) | |
19 callback.Run(); | |
20 else | |
21 thread_runner->PostTask(FROM_HERE, callback); | |
22 } | |
23 | |
24 } // namespace | |
25 | |
26 namespace safe_browsing { | |
27 | |
28 DelayedCallbackRunner::DelayedCallbackRunner( | |
29 base::TimeDelta delay, | |
30 scoped_refptr<base::TaskRunner> task_runner) | |
31 : task_runner_(task_runner), | |
32 next_callback_(callbacks_.end()), | |
33 timer_(FROM_HERE, delay, this, &DelayedCallbackRunner::OnTimer) { | |
34 } | |
35 | |
36 DelayedCallbackRunner::~DelayedCallbackRunner() { | |
37 } | |
38 | |
39 void DelayedCallbackRunner::RegisterCallback(const base::Closure& callback) { | |
40 DCHECK(thread_checker_.CalledOnValidThread()); | |
41 callbacks_.push_back(base::Bind(&RunCallbackOnOriginThread, | |
grt (UTC plus 2)
2014/08/04 14:16:29
oops, this is totally wrong.
| |
42 callback, | |
43 base::ThreadTaskRunnerHandle::Get())); | |
44 } | |
45 | |
46 void DelayedCallbackRunner::Start() { | |
47 DCHECK(thread_checker_.CalledOnValidThread()); | |
48 | |
49 // Nothing to do if the runner is already running or nothing has been added. | |
50 if (next_callback_ != callbacks_.end() || callbacks_.empty()) | |
51 return; | |
52 | |
53 // Prime the system with the first callback. | |
54 next_callback_ = callbacks_.begin(); | |
55 | |
56 // Point the starter pistol in the air and pull the trigger. | |
57 timer_.Reset(); | |
58 } | |
59 | |
60 void DelayedCallbackRunner::OnTimer() { | |
61 // Run the next callback on the task runner. | |
62 task_runner_->PostTask(FROM_HERE, *next_callback_); | |
63 | |
64 // Remove this callback and get ready for the next if there is one. | |
65 next_callback_ = callbacks_.erase(next_callback_); | |
66 if (next_callback_ != callbacks_.end()) | |
67 timer_.Reset(); | |
68 } | |
69 | |
70 } // namespace safe_browsing | |
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