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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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