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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.
#ifndef CHROME_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_
#define CHROME_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_
#include <set>
#include <vector>
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "chrome/browser/device_orientation/data_fetcher.h"
#include "chrome/browser/device_orientation/orientation.h"
#include "chrome/browser/device_orientation/provider.h"
class MessageLoop;
namespace base {
class Thread;
}
namespace device_orientation {
class ProviderImpl : public Provider {
public:
typedef DataFetcher* (*DataFetcherFactory)();
// Create a ProviderImpl that uses the NULL-terminated factories array to find
// a DataFetcher that can provide orientation data.
ProviderImpl(const DataFetcherFactory factories[]);
// From Provider.
virtual void AddObserver(Observer* observer);
virtual void RemoveObserver(Observer* observer);
private:
virtual ~ProviderImpl();
// Starts or Stops the provider. Called from creator_loop_.
void Start();
void Stop();
// Method for finding a suitable DataFetcher and starting the polling.
// Runs on the polling_thread_.
void DoInitializePollingThread(std::vector<DataFetcherFactory> factories);
void ScheduleInitializePollingThread();
// Method for polling a DataFetcher. Runs on the polling_thread_.
void DoPoll();
void ScheduleDoPoll();
// Method for notifying observers of an orientation update.
// Runs on the creator_thread_.
void DoNotify(Orientation orientation);
void ScheduleDoNotify(Orientation orientation);
static bool SignificantlyDifferent(const Orientation& orientation1,
const Orientation& orientation2);
enum { kDesiredSamplingIntervalMs = 100 };
int SamplingIntervalMs() const;
// 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_.
std::vector<DataFetcherFactory> factories_;
std::set<Observer*> observers_;
Orientation last_notification_;
// When polling_thread_ is running, members below are only to be used
// from that thread.
scoped_ptr<DataFetcher> data_fetcher_;
Orientation last_orientation_;
ScopedRunnableMethodFactory<ProviderImpl> do_poll_method_factory_;
// Polling is done on this background thread.
scoped_ptr<base::Thread> polling_thread_;
};
} // namespace device_orientation
#endif // CHROME_BROWSER_DEVICE_ORIENTATION_PROVIDER_IMPL_H_
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