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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_
#define COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_
#include <string>
namespace metrics {
// Provides machine characteristics used as a machine id. The implementation is
// platform specific. GetMachineId() must be called on a thread which allows
// I/O. GetMachineId() must not be called if HasId() returns false on this
// platform.
class MachineIdProvider {
public:
MachineIdProvider();
MachineIdProvider(const MachineIdProvider&) = delete;
MachineIdProvider& operator=(const MachineIdProvider&) = delete;
virtual ~MachineIdProvider();
// Returns true if this platform provides a non-empty GetMachineId(). This is
// useful to avoid an async call to GetMachineId() on platforms with no
// implementation.
virtual bool HasId() const;
// Get a string containing machine characteristics, to be used as a machine
// id. The implementation is split into Windows and non-Windows. The former
// returns the drive serial number and the latter returns the hardware
// model name. Should not be called if HasId() returns false.
// The return value should not be stored to disk or transmitted.
virtual std::string GetMachineId() const;
};
} // namespace metrics
#endif // COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_
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