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// 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/message_loop/message_loop.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(BrowserThread::CurrentlyOn(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(BrowserThread::CurrentlyOn(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(BrowserThread::CurrentlyOn(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(BrowserThread::CurrentlyOn(BrowserThread::UI));
return Singleton<GeolocationProviderImpl>::get();
}
GeolocationProviderImpl::GeolocationProviderImpl()
: base::Thread("Geolocation"),
user_did_opt_into_location_services_(false),
ignore_location_updates_(false),
arbitrator_(NULL) {
DCHECK(BrowserThread::CurrentlyOn(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(BrowserThread::CurrentlyOn(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);
}
message_loop()->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()) {
message_loop()->PostTask(
FROM_HERE,
base::Bind(&GeolocationProviderImpl::InformProvidersPermissionGranted,
base::Unretained(this)));
return;
}
DCHECK(OnGeolocationThread());
DCHECK(arbitrator_);
arbitrator_->OnPermissionGranted();
}
void GeolocationProviderImpl::NotifyClients(const Geoposition& position) {
DCHECK(BrowserThread::CurrentlyOn(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
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