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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 "content/browser/geolocation/wifi_data_provider_manager.h" | |
6 | |
7 #include "content/browser/geolocation/wifi_data_provider.h" | |
8 | |
9 namespace content { | |
10 | |
11 // static | |
12 WifiDataProviderManager* WifiDataProviderManager::instance_ = NULL; | |
13 | |
14 // static | |
15 WifiDataProviderManager::ImplFactoryFunction | |
16 WifiDataProviderManager::factory_function_ = DefaultFactoryFunction; | |
17 | |
18 // static | |
19 void WifiDataProviderManager::SetFactoryForTesting( | |
20 ImplFactoryFunction factory_function_in) { | |
21 factory_function_ = factory_function_in; | |
22 } | |
23 | |
24 // static | |
25 void WifiDataProviderManager::ResetFactoryForTesting() { | |
26 factory_function_ = DefaultFactoryFunction; | |
27 } | |
28 | |
29 // static | |
30 WifiDataProviderManager* WifiDataProviderManager::Register( | |
31 WifiDataUpdateCallback* callback) { | |
32 bool need_to_start_data_provider = false; | |
33 if (!instance_) { | |
34 instance_ = new WifiDataProviderManager(); | |
35 need_to_start_data_provider = true; | |
36 } | |
37 DCHECK(instance_); | |
38 instance_->AddCallback(callback); | |
39 // Start the provider after adding the callback, to avoid any race in | |
40 // it running early. | |
41 if (need_to_start_data_provider) | |
42 instance_->StartDataProvider(); | |
43 return instance_; | |
44 } | |
45 | |
46 // static | |
47 bool WifiDataProviderManager::Unregister(WifiDataUpdateCallback* callback) { | |
48 DCHECK(instance_); | |
49 DCHECK(instance_->has_callbacks()); | |
50 if (!instance_->RemoveCallback(callback)) { | |
51 return false; | |
52 } | |
53 if (!instance_->has_callbacks()) { | |
54 // Must stop the data provider (and any implementation threads) before | |
55 // destroying to avoid any race conditions in access to the provider in | |
56 // the destructor chain. | |
57 instance_->StopDataProvider(); | |
58 delete instance_; | |
59 instance_ = NULL; | |
60 } | |
61 return true; | |
62 } | |
63 | |
64 WifiDataProviderManager::WifiDataProviderManager() { | |
65 DCHECK(factory_function_); | |
66 impl_ = (*factory_function_)(); | |
67 DCHECK(impl_.get()); | |
68 } | |
69 | |
70 WifiDataProviderManager::~WifiDataProviderManager() { | |
71 DCHECK(impl_.get()); | |
72 } | |
73 | |
74 bool WifiDataProviderManager::GetData(WifiData* data) { | |
75 return impl_->GetData(data); | |
76 } | |
77 | |
78 void WifiDataProviderManager::AddCallback(WifiDataUpdateCallback* callback) { | |
79 impl_->AddCallback(callback); | |
80 } | |
81 | |
82 bool WifiDataProviderManager::RemoveCallback(WifiDataUpdateCallback* callback) { | |
83 return impl_->RemoveCallback(callback); | |
84 } | |
85 | |
86 bool WifiDataProviderManager::has_callbacks() const { | |
87 return impl_->has_callbacks(); | |
88 } | |
89 | |
90 void WifiDataProviderManager::StartDataProvider() { | |
91 impl_->StartDataProvider(); | |
92 } | |
93 | |
94 void WifiDataProviderManager::StopDataProvider() { | |
95 impl_->StopDataProvider(); | |
96 } | |
97 | |
98 } // namespace content | |
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