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1 // Copyright 2013 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 "content/browser/geolocation/wifi_data_provider.h" | |
6 | |
7 #include "base/bind.h" | |
8 #include "base/callback.h" | |
9 #include "base/location.h" | |
10 #include "base/threading/thread_task_runner_handle.h" | |
11 | |
12 namespace content { | |
13 | |
14 WifiDataProvider::WifiDataProvider() | |
15 : client_task_runner_(base::ThreadTaskRunnerHandle::Get()) { | |
16 DCHECK(client_task_runner_); | |
17 } | |
18 | |
19 WifiDataProvider::~WifiDataProvider() { | |
20 } | |
21 | |
22 void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) { | |
23 callbacks_.insert(callback); | |
24 } | |
25 | |
26 bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) { | |
27 return callbacks_.erase(callback) == 1; | |
28 } | |
29 | |
30 bool WifiDataProvider::has_callbacks() const { | |
31 return !callbacks_.empty(); | |
32 } | |
33 | |
34 void WifiDataProvider::RunCallbacks() { | |
35 client_task_runner_->PostTask( | |
36 FROM_HERE, base::Bind(&WifiDataProvider::DoRunCallbacks, this)); | |
37 } | |
38 | |
39 bool WifiDataProvider::CalledOnClientThread() const { | |
40 return client_task_runner()->BelongsToCurrentThread(); | |
41 } | |
42 | |
43 void WifiDataProvider::DoRunCallbacks() { | |
44 // It's possible that all the callbacks went away whilst this task was | |
45 // pending. This is fine; the loop will be a no-op. | |
46 CallbackSet::const_iterator iter = callbacks_.begin(); | |
47 while (iter != callbacks_.end()) { | |
48 WifiDataUpdateCallback* callback = *iter; | |
49 ++iter; // Advance iter before running, in case callback unregisters. | |
50 callback->Run(); | |
51 } | |
52 } | |
53 | |
54 } // namespace content | |
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