| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "content/browser/geolocation/geolocation_provider_impl.h" |
| |
| #include "base/bind.h" |
| #include "base/bind_helpers.h" |
| #include "base/callback.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/memory/singleton.h" |
| #include "base/single_thread_task_runner.h" |
| #include "content/browser/geolocation/location_arbitrator_impl.h" |
| #include "content/public/browser/browser_thread.h" |
| |
| namespace content { |
| |
| GeolocationProvider* GeolocationProvider::GetInstance() { |
| return GeolocationProviderImpl::GetInstance(); |
| } |
| |
| scoped_ptr<GeolocationProvider::Subscription> |
| GeolocationProviderImpl::AddLocationUpdateCallback( |
| const LocationUpdateCallback& callback, bool use_high_accuracy) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| scoped_ptr<GeolocationProvider::Subscription> subscription; |
| if (use_high_accuracy) { |
| subscription = high_accuracy_callbacks_.Add(callback); |
| } else { |
| subscription = low_accuracy_callbacks_.Add(callback); |
| } |
| |
| OnClientsChanged(); |
| if (position_.Validate() || |
| position_.error_code != Geoposition::ERROR_CODE_NONE) { |
| callback.Run(position_); |
| } |
| |
| return subscription.Pass(); |
| } |
| |
| void GeolocationProviderImpl::UserDidOptIntoLocationServices() { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| bool was_permission_granted = user_did_opt_into_location_services_; |
| user_did_opt_into_location_services_ = true; |
| if (IsRunning() && !was_permission_granted) |
| InformProvidersPermissionGranted(); |
| } |
| |
| void GeolocationProviderImpl::OverrideLocationForTesting( |
| const Geoposition& position) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| ignore_location_updates_ = true; |
| NotifyClients(position); |
| } |
| |
| void GeolocationProviderImpl::OnLocationUpdate(const Geoposition& position) { |
| DCHECK(OnGeolocationThread()); |
| // Will be true only in testing. |
| if (ignore_location_updates_) |
| return; |
| BrowserThread::PostTask(BrowserThread::UI, |
| FROM_HERE, |
| base::Bind(&GeolocationProviderImpl::NotifyClients, |
| base::Unretained(this), position)); |
| } |
| |
| GeolocationProviderImpl* GeolocationProviderImpl::GetInstance() { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| return base::Singleton<GeolocationProviderImpl>::get(); |
| } |
| |
| GeolocationProviderImpl::GeolocationProviderImpl() |
| : base::Thread("Geolocation"), |
| user_did_opt_into_location_services_(false), |
| ignore_location_updates_(false), |
| arbitrator_(NULL) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| high_accuracy_callbacks_.set_removal_callback( |
| base::Bind(&GeolocationProviderImpl::OnClientsChanged, |
| base::Unretained(this))); |
| low_accuracy_callbacks_.set_removal_callback( |
| base::Bind(&GeolocationProviderImpl::OnClientsChanged, |
| base::Unretained(this))); |
| } |
| |
| GeolocationProviderImpl::~GeolocationProviderImpl() { |
| Stop(); |
| DCHECK(!arbitrator_); |
| } |
| |
| bool GeolocationProviderImpl::OnGeolocationThread() const { |
| return base::MessageLoop::current() == message_loop(); |
| } |
| |
| void GeolocationProviderImpl::OnClientsChanged() { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| base::Closure task; |
| if (high_accuracy_callbacks_.empty() && low_accuracy_callbacks_.empty()) { |
| DCHECK(IsRunning()); |
| if (!ignore_location_updates_) { |
| // We have no more observers, so we clear the cached geoposition so that |
| // when the next observer is added we will not provide a stale position. |
| position_ = Geoposition(); |
| } |
| task = base::Bind(&GeolocationProviderImpl::StopProviders, |
| base::Unretained(this)); |
| } else { |
| if (!IsRunning()) { |
| Start(); |
| if (user_did_opt_into_location_services_) |
| InformProvidersPermissionGranted(); |
| } |
| // Determine a set of options that satisfies all clients. |
| bool use_high_accuracy = !high_accuracy_callbacks_.empty(); |
| |
| // Send the current options to the providers as they may have changed. |
| task = base::Bind(&GeolocationProviderImpl::StartProviders, |
| base::Unretained(this), |
| use_high_accuracy); |
| } |
| |
| task_runner()->PostTask(FROM_HERE, task); |
| } |
| |
| void GeolocationProviderImpl::StopProviders() { |
| DCHECK(OnGeolocationThread()); |
| DCHECK(arbitrator_); |
| arbitrator_->StopProviders(); |
| } |
| |
| void GeolocationProviderImpl::StartProviders(bool use_high_accuracy) { |
| DCHECK(OnGeolocationThread()); |
| DCHECK(arbitrator_); |
| arbitrator_->StartProviders(use_high_accuracy); |
| } |
| |
| void GeolocationProviderImpl::InformProvidersPermissionGranted() { |
| DCHECK(IsRunning()); |
| if (!OnGeolocationThread()) { |
| task_runner()->PostTask( |
| FROM_HERE, |
| base::Bind(&GeolocationProviderImpl::InformProvidersPermissionGranted, |
| base::Unretained(this))); |
| return; |
| } |
| DCHECK(OnGeolocationThread()); |
| DCHECK(arbitrator_); |
| arbitrator_->OnPermissionGranted(); |
| } |
| |
| void GeolocationProviderImpl::NotifyClients(const Geoposition& position) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| DCHECK(position.Validate() || |
| position.error_code != Geoposition::ERROR_CODE_NONE); |
| position_ = position; |
| high_accuracy_callbacks_.Notify(position_); |
| low_accuracy_callbacks_.Notify(position_); |
| } |
| |
| void GeolocationProviderImpl::Init() { |
| DCHECK(OnGeolocationThread()); |
| DCHECK(!arbitrator_); |
| arbitrator_ = CreateArbitrator(); |
| } |
| |
| void GeolocationProviderImpl::CleanUp() { |
| DCHECK(OnGeolocationThread()); |
| delete arbitrator_; |
| arbitrator_ = NULL; |
| } |
| |
| LocationArbitrator* GeolocationProviderImpl::CreateArbitrator() { |
| LocationArbitratorImpl::LocationUpdateCallback callback = base::Bind( |
| &GeolocationProviderImpl::OnLocationUpdate, base::Unretained(this)); |
| return new LocationArbitratorImpl(callback); |
| } |
| |
| } // namespace content |