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| 1 // Copyright (c) 2010 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/geolocation_provider.h" | |
| 6 | |
| 7 #include "base/singleton.h" | |
| 8 #include "base/threading/thread_restrictions.h" | |
| 9 #include "content/browser/geolocation/location_arbitrator.h" | |
| 10 | |
| 11 // This class is guaranteed to outlive its internal thread, so ref counting | |
| 12 // is not required. | |
| 13 DISABLE_RUNNABLE_METHOD_REFCOUNT(GeolocationProvider); | |
| 14 | |
| 15 GeolocationProvider* GeolocationProvider::GetInstance() { | |
| 16 return Singleton<GeolocationProvider>::get(); | |
| 17 } | |
| 18 | |
| 19 GeolocationProvider::GeolocationProvider() | |
| 20 : base::Thread("Geolocation"), | |
| 21 client_loop_(base::MessageLoopProxy::CreateForCurrentThread()), | |
| 22 arbitrator_(NULL) { | |
| 23 } | |
| 24 | |
| 25 GeolocationProvider::~GeolocationProvider() { | |
| 26 DCHECK(observers_.empty()); // observers must unregister. | |
| 27 Stop(); | |
| 28 DCHECK(!arbitrator_); | |
| 29 } | |
| 30 | |
| 31 void GeolocationProvider::AddObserver(GeolocationObserver* observer, | |
| 32 const GeolocationObserverOptions& update_options) { | |
| 33 DCHECK(OnClientThread()); | |
| 34 observers_[observer] = update_options; | |
| 35 OnObserversChanged(); | |
| 36 if (position_.IsInitialized()) | |
| 37 observer->OnLocationUpdate(position_); | |
| 38 } | |
| 39 | |
| 40 bool GeolocationProvider::RemoveObserver(GeolocationObserver* observer) { | |
| 41 DCHECK(OnClientThread()); | |
| 42 size_t remove = observers_.erase(observer); | |
| 43 OnObserversChanged(); | |
| 44 return remove > 0; | |
| 45 } | |
| 46 | |
| 47 void GeolocationProvider::OnObserversChanged() { | |
| 48 DCHECK(OnClientThread()); | |
| 49 Task* task = NULL; | |
| 50 if (observers_.empty()) { | |
| 51 DCHECK(IsRunning()); | |
| 52 task = NewRunnableMethod(this, &GeolocationProvider::StopProviders); | |
| 53 } else { | |
| 54 if (!IsRunning()) { | |
| 55 Start(); | |
| 56 if (HasPermissionBeenGranted()) | |
| 57 InformProvidersPermissionGranted(most_recent_authorized_frame_); | |
| 58 } | |
| 59 // The high accuracy requirement may have changed. | |
| 60 task = NewRunnableMethod( | |
| 61 this, | |
| 62 &GeolocationProvider::StartProviders, | |
| 63 GeolocationObserverOptions::Collapse(observers_)); | |
| 64 } | |
| 65 message_loop()->PostTask(FROM_HERE, task); | |
| 66 } | |
| 67 | |
| 68 void GeolocationProvider::NotifyObservers(const Geoposition& position) { | |
| 69 DCHECK(OnClientThread()); | |
| 70 DCHECK(position.IsInitialized()); | |
| 71 position_ = position; | |
| 72 ObserverMap::const_iterator it = observers_.begin(); | |
| 73 while (it != observers_.end()) { | |
| 74 // Advance iterator before callback to guard against synchronous unregister. | |
| 75 GeolocationObserver* observer = it->first; | |
| 76 ++it; | |
| 77 observer->OnLocationUpdate(position_); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 void GeolocationProvider::StartProviders( | |
| 82 const GeolocationObserverOptions& options) { | |
| 83 DCHECK(OnGeolocationThread()); | |
| 84 DCHECK(arbitrator_); | |
| 85 arbitrator_->StartProviders(options); | |
| 86 } | |
| 87 | |
| 88 void GeolocationProvider::StopProviders() { | |
| 89 DCHECK(OnGeolocationThread()); | |
| 90 DCHECK(arbitrator_); | |
| 91 arbitrator_->StopProviders(); | |
| 92 } | |
| 93 | |
| 94 void GeolocationProvider::OnPermissionGranted(const GURL& requesting_frame) { | |
| 95 DCHECK(OnClientThread()); | |
| 96 most_recent_authorized_frame_ = requesting_frame; | |
| 97 if (IsRunning()) | |
| 98 InformProvidersPermissionGranted(requesting_frame); | |
| 99 } | |
| 100 | |
| 101 void GeolocationProvider::InformProvidersPermissionGranted( | |
| 102 const GURL& requesting_frame) { | |
| 103 DCHECK(IsRunning()); | |
| 104 DCHECK(requesting_frame.is_valid()); | |
| 105 if (!OnGeolocationThread()) { | |
| 106 Task* task = NewRunnableMethod( | |
| 107 this, | |
| 108 &GeolocationProvider::InformProvidersPermissionGranted, | |
| 109 requesting_frame); | |
| 110 message_loop()->PostTask(FROM_HERE, task); | |
| 111 return; | |
| 112 } | |
| 113 DCHECK(OnGeolocationThread()); | |
| 114 DCHECK(arbitrator_); | |
| 115 arbitrator_->OnPermissionGranted(requesting_frame); | |
| 116 } | |
| 117 | |
| 118 void GeolocationProvider::Init() { | |
| 119 DCHECK(OnGeolocationThread()); | |
| 120 DCHECK(!arbitrator_); | |
| 121 arbitrator_ = GeolocationArbitrator::Create(this); | |
| 122 } | |
| 123 | |
| 124 void GeolocationProvider::CleanUp() { | |
| 125 DCHECK(OnGeolocationThread()); | |
| 126 delete arbitrator_; | |
| 127 arbitrator_ = NULL; | |
| 128 } | |
| 129 | |
| 130 void GeolocationProvider::OnLocationUpdate(const Geoposition& position) { | |
| 131 DCHECK(OnGeolocationThread()); | |
| 132 Task* task = NewRunnableMethod(this, | |
| 133 &GeolocationProvider::NotifyObservers, | |
| 134 position); | |
| 135 client_loop_->PostTask(FROM_HERE, task); | |
| 136 } | |
| 137 | |
| 138 bool GeolocationProvider::HasPermissionBeenGranted() const { | |
| 139 DCHECK(OnClientThread()); | |
| 140 return most_recent_authorized_frame_.is_valid(); | |
| 141 } | |
| 142 | |
| 143 bool GeolocationProvider::OnClientThread() const { | |
| 144 return client_loop_->BelongsToCurrentThread(); | |
| 145 } | |
| 146 | |
| 147 bool GeolocationProvider::OnGeolocationThread() const { | |
| 148 return MessageLoop::current() == message_loop(); | |
| 149 } | |
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Chromium Code Reviews
Issue 6597044:
Revert 76228 - Move core pieces of geolocation from chrome to content.This is... (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src/