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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/location_arbitrator.h"
#include <map>
#include "base/logging.h"
#include "base/non_thread_safe.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "base/string_util.h"
#include "chrome/browser/net/url_request_context_getter.h"
#include "chrome/browser/geolocation/access_token_store.h"
#include "chrome/browser/geolocation/location_provider.h"
#include "chrome/common/geoposition.h"
#include "googleurl/src/gurl.h"
namespace {
const char* kDefaultNetworkProviderUrl = "https://www.google.com/loc/json";
} // namespace
class GeolocationArbitratorImpl
: public GeolocationArbitrator,
public LocationProviderBase::ListenerInterface,
public NonThreadSafe {
public:
GeolocationArbitratorImpl(AccessTokenStore* access_token_store,
URLRequestContextGetter* context_getter);
virtual ~GeolocationArbitratorImpl();
// GeolocationArbitrator
virtual void AddObserver(GeolocationArbitrator::Delegate* delegate,
const UpdateOptions& update_options);
virtual bool RemoveObserver(GeolocationArbitrator::Delegate* delegate);
virtual void SetUseMockProvider(bool use_mock);
// ListenerInterface
virtual void LocationUpdateAvailable(LocationProviderBase* provider);
virtual void MovementDetected(LocationProviderBase* provider);
void OnAccessTokenStoresLoaded(
AccessTokenStore::AccessTokenSet access_token_store);
private:
void CreateProviders();
bool HasHighAccuracyObserver();
scoped_refptr<AccessTokenStore> access_token_store_;
scoped_refptr<URLRequestContextGetter> context_getter_;
const GURL default_url_;
scoped_ptr<LocationProviderBase> provider_;
typedef std::map<GeolocationArbitrator::Delegate*, UpdateOptions> DelegateMap;
DelegateMap observers_;
// The current best estimate of our position.
Geoposition position_;
CancelableRequestConsumer request_consumer_;
bool use_mock_;
};
GeolocationArbitratorImpl::GeolocationArbitratorImpl(
AccessTokenStore* access_token_store,
URLRequestContextGetter* context_getter)
: access_token_store_(access_token_store),
context_getter_(context_getter),
default_url_(kDefaultNetworkProviderUrl),
use_mock_(false) {
DCHECK(default_url_.is_valid());
}
GeolocationArbitratorImpl::~GeolocationArbitratorImpl() {
DCHECK(CalledOnValidThread());
DCHECK(observers_.empty()) << "Not all observers have unregistered";
}
void GeolocationArbitratorImpl::AddObserver(
GeolocationArbitrator::Delegate* delegate,
const UpdateOptions& update_options) {
DCHECK(CalledOnValidThread());
observers_[delegate] = update_options;
if (provider_ == NULL) {
CreateProviders();
} else if (position_.IsInitialized()) {
delegate->OnLocationUpdate(position_);
}
}
bool GeolocationArbitratorImpl::RemoveObserver(
GeolocationArbitrator::Delegate* delegate) {
DCHECK(CalledOnValidThread());
size_t remove = observers_.erase(delegate);
if (observers_.empty() && provider_ != NULL) {
// TODO(joth): Delayed callback to linger before destroying the provider.
provider_->UnregisterListener(this);
provider_.reset();
}
return remove > 0;
}
void GeolocationArbitratorImpl::SetUseMockProvider(bool use_mock) {
DCHECK(CalledOnValidThread());
DCHECK(provider_ == NULL);
use_mock_ = use_mock;
}
void GeolocationArbitratorImpl::LocationUpdateAvailable(
LocationProviderBase* provider) {
DCHECK(CalledOnValidThread());
DCHECK(provider);
provider->GetPosition(&position_);
DCHECK(position_.IsInitialized());
// TODO(joth): Arbitrate.
DelegateMap::const_iterator it = observers_.begin();
while (it != observers_.end()) {
// Advance iterator before callback to guard against synchronous deregister.
Delegate* delegate = it->first;
++it;
delegate->OnLocationUpdate(position_);
}
}
void GeolocationArbitratorImpl::MovementDetected(
LocationProviderBase* provider) {
DCHECK(CalledOnValidThread());
}
void GeolocationArbitratorImpl::OnAccessTokenStoresLoaded(
AccessTokenStore::AccessTokenSet access_token_set) {
DCHECK(provider_ == NULL)
<< "OnAccessTokenStoresLoaded : has existing location "
<< "provider. Race condition caused repeat load of tokens?";
if (use_mock_) {
provider_.reset(NewMockLocationProvider());
} else {
// TODO(joth): Once we have arbitration implementation, iterate the whole
// set rather than cherry-pick our defaul url.
const AccessTokenStore::AccessTokenSet::const_iterator token =
access_token_set.find(default_url_);
// TODO(joth): Follow up with GLS folks if they have a plan for replacing
// the hostname field. Sending chromium.org is a stop-gap.
provider_.reset(NewNetworkLocationProvider(
access_token_store_.get(), context_getter_.get(), default_url_,
token != access_token_set.end() ? token->second : string16(),
ASCIIToUTF16("chromium.org")));
}
DCHECK(provider_ != NULL);
provider_->RegisterListener(this);
const bool ok = provider_->StartProvider();
DCHECK(ok);
}
void GeolocationArbitratorImpl::CreateProviders() {
DCHECK(CalledOnValidThread());
DCHECK(!observers_.empty());
DCHECK(provider_ == NULL);
if (!request_consumer_.HasPendingRequests()) {
access_token_store_->LoadAccessTokens(
&request_consumer_,
NewCallback(this,
&GeolocationArbitratorImpl::OnAccessTokenStoresLoaded));
}
// TODO(joth): Use high accuracy flag to conditionally create GPS provider.
}
bool GeolocationArbitratorImpl::HasHighAccuracyObserver() {
DCHECK(CalledOnValidThread());
for (DelegateMap::const_iterator it = observers_.begin();
it != observers_.end(); ++it) {
if (it->second.use_high_accuracy)
return true;
}
return false;
}
GeolocationArbitrator* GeolocationArbitrator::Create(
URLRequestContextGetter* context_getter) {
return new GeolocationArbitratorImpl(NewChromePrefsAccessTokenStore(),
context_getter);
}
GeolocationArbitrator* GeolocationArbitrator::Create(
AccessTokenStore* access_token_store,
URLRequestContextGetter* context_getter) {
return new GeolocationArbitratorImpl(access_token_store,
context_getter);
}
GeolocationArbitrator::~GeolocationArbitrator() {
}
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