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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_METRICS_MACHINE_ID_PROVIDER_H_
#define COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_
#include <string>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
namespace metrics {
// Provides machine characteristics used as a machine id. The implementation is
// platform specific with a default implementation that gives an empty id. The
// class is ref-counted thread safe so it can be used to post to the FILE thread
// and communicate back to the UI thread.
// This raw machine id should not be stored or transmitted over the network.
// TODO(jwd): Simplify implementation to get rid of the need for
// RefCountedThreadSafe (crbug.com/354882).
class MachineIdProvider : public base::RefCountedThreadSafe<MachineIdProvider> {
public:
// 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.
std::string GetMachineId();
// Returns a pointer to a new MachineIdProvider or NULL if there is no
// provider implemented on a given platform. This is done to avoid posting a
// task to the FILE thread on platforms with no implementation.
static MachineIdProvider* CreateInstance();
private:
friend class base::RefCountedThreadSafe<MachineIdProvider>;
MachineIdProvider();
virtual ~MachineIdProvider();
DISALLOW_COPY_AND_ASSIGN(MachineIdProvider);
};
} // namespace metrics
#endif // COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_
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