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// Copyright (c) 2010 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 "chrome/browser/geolocation/geolocation_provider.h"
#include "base/singleton.h"
#include "chrome/browser/geolocation/location_arbitrator.h"
// This class is guaranteed to outlive its internal thread, so ref counting
// is not required.
DISABLE_RUNNABLE_METHOD_REFCOUNT(GeolocationProvider);
GeolocationProvider* GeolocationProvider::GetInstance() {
return Singleton<GeolocationProvider>::get();
}
GeolocationProvider::GeolocationProvider()
: base::Thread("Geolocation"),
client_loop_(base::MessageLoopProxy::CreateForCurrentThread()),
arbitrator_(NULL) {
}
GeolocationProvider::~GeolocationProvider() {
DCHECK(observers_.empty()); // observers must unregister.
DCHECK(!IsRunning());
Stop();
DCHECK(!arbitrator_);
}
void GeolocationProvider::AddObserver(GeolocationObserver* observer,
const GeolocationObserverOptions& update_options) {
DCHECK(OnClientThread());
observers_[observer] = update_options;
OnObserversChanged();
if (position_.IsInitialized())
observer->OnLocationUpdate(position_);
}
bool GeolocationProvider::RemoveObserver(GeolocationObserver* observer) {
DCHECK(OnClientThread());
size_t remove = observers_.erase(observer);
OnObserversChanged();
return remove > 0;
}
void GeolocationProvider::OnObserversChanged() {
DCHECK(OnClientThread());
if (observers_.empty()) {
Stop();
} else {
if (!IsRunning())
Start();
// The high accuracy requirement may have changed.
Task* task = NewRunnableMethod(this,
&GeolocationProvider::SetObserverOptions,
GeolocationObserverOptions::Collapse(observers_));
message_loop()->PostTask(FROM_HERE, task);
}
}
void GeolocationProvider::NotifyObservers(const Geoposition& position) {
DCHECK(OnClientThread());
DCHECK(position.IsInitialized());
position_ = position;
ObserverMap::const_iterator it = observers_.begin();
while (it != observers_.end()) {
// Advance iterator before callback to guard against synchronous unregister.
GeolocationObserver* observer = it->first;
++it;
observer->OnLocationUpdate(position_);
}
}
void GeolocationProvider::SetObserverOptions(
const GeolocationObserverOptions& options) {
DCHECK(OnGeolocationThread());
if (!arbitrator_)
arbitrator_ = GeolocationArbitrator::Create(this);
arbitrator_->SetObserverOptions(options);
}
void GeolocationProvider::OnPermissionGranted(const GURL& requesting_frame) {
if (!OnGeolocationThread()) {
DCHECK(OnClientThread());
most_recent_authorized_frame_ = requesting_frame;
Task* task = NewRunnableMethod(this,
&GeolocationProvider::OnPermissionGranted, requesting_frame);
message_loop()->PostTask(FROM_HERE, task);
return;
}
DCHECK(OnGeolocationThread());
arbitrator_->OnPermissionGranted(requesting_frame);
}
void GeolocationProvider::Init() {
DCHECK(OnGeolocationThread());
}
void GeolocationProvider::CleanUp() {
DCHECK(OnGeolocationThread());
delete arbitrator_;
arbitrator_ = NULL;
}
void GeolocationProvider::OnLocationUpdate(const Geoposition& position) {
DCHECK(OnGeolocationThread());
Task* task = NewRunnableMethod(this,
&GeolocationProvider::NotifyObservers,
position);
client_loop_->PostTask(FROM_HERE, task);
}
bool GeolocationProvider::HasPermissionBeenGranted() const {
DCHECK(OnClientThread());
return most_recent_authorized_frame_.is_valid();
}
bool GeolocationProvider::OnClientThread() const {
return client_loop_->BelongsToCurrentThread();
}
bool GeolocationProvider::OnGeolocationThread() const {
return MessageLoop::current() == message_loop();
}
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