1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_ 6 #define COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_ 7 8 #include <string> 9 10 #include "base/macros.h" 11 #include "base/memory/ref_counted.h" 12 13 namespace metrics { 14 15 // Provides machine characteristics used as a machine id. The implementation is 16 // platform specific with a default implementation that gives an empty id. The 17 // class is ref-counted thread safe so it can be used to post to the FILE thread 18 // and communicate back to the UI thread. 19 // This raw machine id should not be stored or transmitted over the network. 20 // TODO(jwd): Simplify implementation to get rid of the need for 21 // RefCountedThreadSafe (crbug.com/354882). 22 class MachineIdProvider : public base::RefCountedThreadSafe<MachineIdProvider> { 23 public: 24 // Get a string containing machine characteristics, to be used as a machine 25 // id. The implementation is platform specific, with a default implementation 26 // returning an empty string. 27 // The return value should not be stored to disk or transmitted. 28 std::string GetMachineId(); 29 30 // Returns a pointer to a new MachineIdProvider or NULL if there is no 31 // provider implemented on a given platform. This is done to avoid posting a 32 // task to the FILE thread on platforms with no implementation. 33 static MachineIdProvider* CreateInstance(); 34 35 private: 36 friend class base::RefCountedThreadSafe<MachineIdProvider>; 37 38 MachineIdProvider(); 39 virtual ~MachineIdProvider(); 40 41 DISALLOW_COPY_AND_ASSIGN(MachineIdProvider); 42 }; 43 44 } // namespace metrics 45 46 #endif // COMPONENTS_METRICS_MACHINE_ID_PROVIDER_H_ 47
