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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 <string>
#include "base/macros.h"
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 {
// 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.
static bool HasId();
// Get a string containing machine characteristics, to be used as a machine
// id. The implementation is platform specific, with a default implementation
// returning an empty string.
// The return value should not be stored to disk or transmitted.
static std::string GetMachineId();
} // namespace metrics