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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.
#ifndef CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_
#define CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_
#include <map>
#include <set>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/device_orientation/data_fetcher.h"
#include "content/browser/device_orientation/device_data.h"
#include "content/browser/device_orientation/provider.h"
#include "content/common/content_export.h"
class MessageLoop;
namespace content {
class ProviderImpl : public Provider {
public:
typedef DataFetcher* (*DataFetcherFactory)();
// Create a ProviderImpl that uses the factory to create a DataFetcher that
// can provide data. A NULL DataFetcherFactory indicates that there are no
// DataFetchers for this OS.
CONTENT_EXPORT ProviderImpl(DataFetcherFactory factory);
// From Provider.
virtual void AddObserver(Observer* observer) OVERRIDE;
virtual void RemoveObserver(Observer* observer) OVERRIDE;
private:
class PollingThread;
virtual ~ProviderImpl();
// Starts or Stops the provider. Called from creator_loop_.
void Start(DeviceData::Type type);
void Stop();
void ScheduleInitializePollingThread(DeviceData::Type device_data_type);
void ScheduleDoAddPollingDataType(DeviceData::Type type);
// Method for notifying observers of a data update.
// Runs on the creator_thread_.
void DoNotify(const scoped_refptr<const DeviceData>& data,
DeviceData::Type device_data_type);
static bool ShouldFireEvent(const DeviceData* old_data,
const DeviceData* new_data, DeviceData::Type device_data_type);
// The Message Loop on which this object was created.
// Typically the I/O loop, but may be something else during testing.
MessageLoop* creator_loop_;
// Members below are only to be used from the creator_loop_.
DataFetcherFactory factory_;
std::set<Observer*> observers_;
std::map<DeviceData::Type, scoped_refptr<const DeviceData> >
last_notifications_map_;
// When polling_thread_ is running, members below are only to be used
// from that thread.
base::WeakPtrFactory<ProviderImpl> weak_factory_;
// Polling is done on this background thread. PollingThread is owned by
// the ProviderImpl object. But its deletion doesn't happen synchronously
// along with deletion of the ProviderImpl. Thus this should be a raw
// pointer instead of scoped_ptr.
PollingThread* polling_thread_;
};
} // namespace content
#endif // CONTENT_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_
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