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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.
#ifndef COMPONENTS_SYNC_DRIVER_LOCAL_DEVICE_INFO_PROVIDER_H_
#define COMPONENTS_SYNC_DRIVER_LOCAL_DEVICE_INFO_PROVIDER_H_
#include <string>
#include "base/callback_list.h"
namespace sync_driver {
class DeviceInfo;
// Interface for providing sync specific informaiton about the
// local device.
class LocalDeviceInfoProvider {
public:
typedef base::CallbackList<void(void)>::Subscription Subscription;
virtual ~LocalDeviceInfoProvider() {}
// Returns sync's representation of the local device info;
// NULL if the device info is unavailable.
// The returned object is fully owned by LocalDeviceInfoProvider (must not
// be freed by the caller). It remains valid until LocalDeviceInfoProvider
// is destroyed.
virtual const DeviceInfo* GetLocalDeviceInfo() const = 0;
// Constructs a user agent string (ASCII) suitable for use by the syncapi
// for any HTTP communication. This string is used by the sync backend for
// classifying client types when calculating statistics.
virtual std::string GetSyncUserAgent() const = 0;
// Returns a GUID string used for creation of the machine tag for
// this local session; an empty sting if LocalDeviceInfoProvider hasn't been
// initialized yet.
virtual std::string GetLocalSyncCacheGUID() const = 0;
// Starts initializing local device info.
virtual void Initialize(
const std::string& cache_guid,
const std::string& signin_scoped_device_id) = 0;
// Registers a callback to be called when local device info becomes available.
// The callback will remain registered until the
// returned Subscription is destroyed, which must occur before the
// CallbackList is destroyed.
virtual scoped_ptr<Subscription> RegisterOnInitializedCallback(
const base::Closure& callback) = 0;
};
} // namespace sync_driver
#endif // COMPONENTS_SYNC_DRIVER_LOCAL_DEVICE_INFO_PROVIDER_H_
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