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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 BASE_TEST_STATISTICS_DELTA_READER_H_ | |
6 #define BASE_TEST_STATISTICS_DELTA_READER_H_ | |
7 | |
8 #include <map> | |
9 #include <string> | |
10 | |
11 #include "base/basictypes.h" | |
12 #include "base/memory/scoped_ptr.h" | |
13 | |
14 namespace base { | |
15 | |
16 class HistogramSamples; | |
17 | |
18 // This class acts as a differential reader for histogram samples, enabling | |
19 // tests to check that metrics were recorded as they should be. | |
20 // | |
21 // This class is DEPRECATED. | |
22 // TODO(mlerman): Remove all references to this class with UMAHistogramHelper | |
23 // references. crbug.com/384011 | |
24 class StatisticsDeltaReader { | |
25 public: | |
26 StatisticsDeltaReader(); | |
27 ~StatisticsDeltaReader(); | |
28 | |
29 // Returns the histogram data accumulated since this instance was created. | |
30 // Returns NULL if no samples are available. | |
31 scoped_ptr<HistogramSamples> GetHistogramSamplesSinceCreation( | |
32 const std::string& histogram_name); | |
33 | |
34 private: | |
35 // Used to determine the histogram changes made during this instance's | |
36 // lifecycle. This instance takes ownership of the samples, which are deleted | |
37 // when the instance is destroyed. | |
38 std::map<std::string, HistogramSamples*> original_samples_; | |
39 | |
40 DISALLOW_COPY_AND_ASSIGN(StatisticsDeltaReader); | |
41 }; | |
42 | |
43 } // namespace base | |
44 | |
45 #endif // BASE_TEST_STATISTICS_DELTA_READER_H_ | |
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