Reland 2:Geolocation: move from content/browser to device/

content/browser/geolocation/geolocation_provider_impl.cc

-// 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/lazy_instance.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/memory/ptr_util.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"
-#include "content/public/browser/content_browser_client.h"
-#include "content/public/browser/geolocation_delegate.h"
-
-namespace content {
-
-namespace {
-base::LazyInstance<std::unique_ptr<GeolocationDelegate>>::Leaky g_delegate =
-    LAZY_INSTANCE_INITIALIZER;
-}  // anonymous namespace
-
-// static
-GeolocationProvider* GeolocationProvider::GetInstance() {
-  return GeolocationProviderImpl::GetInstance();
-}
-
-// static
-void GeolocationProvider::SetGeolocationDelegate(
-    GeolocationDelegate* delegate) {
-  DCHECK(!g_delegate.Get());
-  g_delegate.Get().reset(delegate);
-}
-
-std::unique_ptr<GeolocationProvider::Subscription>
-GeolocationProviderImpl::AddLocationUpdateCallback(
-    const LocationUpdateCallback& callback,
-    bool enable_high_accuracy) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  std::unique_ptr<GeolocationProvider::Subscription> subscription;
-  if (enable_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;
-}
-
-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));
-}
-
-// static
-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) {
-  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 task_runner()->BelongsToCurrentThread();
-}
-
-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 enable_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), enable_high_accuracy);
-  }
-
-  task_runner()->PostTask(FROM_HERE, task);
-}
-
-void GeolocationProviderImpl::StopProviders() {
-  DCHECK(OnGeolocationThread());
-  DCHECK(arbitrator_);
-  arbitrator_->StopProviders();
-}
-
-void GeolocationProviderImpl::StartProviders(bool enable_high_accuracy) {
-  DCHECK(OnGeolocationThread());
-  DCHECK(arbitrator_);
-  arbitrator_->StartProviders(enable_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());
-  arbitrator_.reset();
-}
-
-std::unique_ptr<LocationArbitrator>
-GeolocationProviderImpl::CreateArbitrator() {
-  LocationArbitratorImpl::LocationUpdateCallback callback = base::Bind(
-      &GeolocationProviderImpl::OnLocationUpdate, base::Unretained(this));
-  // Use the embedder's |g_delegate| or fall back to the default one.
-  if (!g_delegate.Get())
-    g_delegate.Get().reset(new GeolocationDelegate);
-
-  return base::WrapUnique(
-      new LocationArbitratorImpl(callback, g_delegate.Get().get()));
-}
-
-}  // namespace content