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// Copyright 2014 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/wifi_data_provider_manager.h"
#include "content/browser/geolocation/wifi_data_provider.h"
namespace content {
// static
WifiDataProviderManager* WifiDataProviderManager::instance_ = NULL;
// static
WifiDataProviderManager::ImplFactoryFunction
WifiDataProviderManager::factory_function_ = DefaultFactoryFunction;
// static
void WifiDataProviderManager::SetFactoryForTesting(
ImplFactoryFunction factory_function_in) {
factory_function_ = factory_function_in;
}
// static
void WifiDataProviderManager::ResetFactoryForTesting() {
factory_function_ = DefaultFactoryFunction;
}
// static
WifiDataProviderManager* WifiDataProviderManager::Register(
WifiDataUpdateCallback* callback) {
bool need_to_start_data_provider = false;
if (!instance_) {
instance_ = new WifiDataProviderManager();
need_to_start_data_provider = true;
}
DCHECK(instance_);
instance_->AddCallback(callback);
// Start the provider after adding the callback, to avoid any race in
// it running early.
if (need_to_start_data_provider)
instance_->StartDataProvider();
return instance_;
}
// static
bool WifiDataProviderManager::Unregister(WifiDataUpdateCallback* callback) {
DCHECK(instance_);
DCHECK(instance_->has_callbacks());
if (!instance_->RemoveCallback(callback)) {
return false;
}
if (!instance_->has_callbacks()) {
// Must stop the data provider (and any implementation threads) before
// destroying to avoid any race conditions in access to the provider in
// the destructor chain.
instance_->StopDataProvider();
delete instance_;
instance_ = NULL;
}
return true;
}
WifiDataProviderManager::WifiDataProviderManager() {
DCHECK(factory_function_);
impl_ = (*factory_function_)();
DCHECK(impl_.get());
}
WifiDataProviderManager::~WifiDataProviderManager() {
DCHECK(impl_.get());
}
bool WifiDataProviderManager::GetData(WifiData* data) {
return impl_->GetData(data);
}
void WifiDataProviderManager::AddCallback(WifiDataUpdateCallback* callback) {
impl_->AddCallback(callback);
}
bool WifiDataProviderManager::RemoveCallback(WifiDataUpdateCallback* callback) {
return impl_->RemoveCallback(callback);
}
bool WifiDataProviderManager::has_callbacks() const {
return impl_->has_callbacks();
}
void WifiDataProviderManager::StartDataProvider() {
impl_->StartDataProvider();
}
void WifiDataProviderManager::StopDataProvider() {
impl_->StopDataProvider();
}
} // namespace content
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