| // 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_ |