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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ | 5 #ifndef BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ |
6 #define BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ | 6 #define BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ |
7 | 7 |
8 #include <map> | 8 #include <map> |
9 #include <string> | 9 #include <string> |
10 | 10 |
11 #include "base/basictypes.h" | 11 #include "base/basictypes.h" |
12 #include "base/metrics/histogram.h" | 12 #include "base/metrics/histogram_base.h" |
13 | 13 |
14 namespace base { | 14 namespace base { |
15 | 15 |
16 class HistogramSamples; | 16 class HistogramSamples; |
17 class HistogramFlattener; | 17 class HistogramFlattener; |
18 | 18 |
19 // HistogramSnapshotManager handles the logistics of gathering up available | 19 // HistogramSnapshotManager handles the logistics of gathering up available |
20 // histograms for recording either to disk or for transmission (such as from | 20 // histograms for recording either to disk or for transmission (such as from |
21 // renderer to browser, or from browser to UMA upload). Since histograms can sit | 21 // renderer to browser, or from browser to UMA upload). Since histograms can sit |
22 // in memory for an extended period of time, and are vulnerable to memory | 22 // in memory for an extended period of time, and are vulnerable to memory |
23 // corruption, this class also validates as much rendundancy as it can before | 23 // corruption, this class also validates as much rendundancy as it can before |
24 // calling for the marginal change (a.k.a., delta) in a histogram to be | 24 // calling for the marginal change (a.k.a., delta) in a histogram to be |
25 // recorded. | 25 // recorded. |
26 class BASE_EXPORT HistogramSnapshotManager { | 26 class BASE_EXPORT HistogramSnapshotManager { |
27 public: | 27 public: |
28 explicit HistogramSnapshotManager(HistogramFlattener* histogram_flattener); | 28 explicit HistogramSnapshotManager(HistogramFlattener* histogram_flattener); |
29 virtual ~HistogramSnapshotManager(); | 29 virtual ~HistogramSnapshotManager(); |
30 | 30 |
31 // Snapshot all histograms, and ask |histogram_flattener_| to record the | 31 // Snapshot all histograms, and ask |histogram_flattener_| to record the |
32 // delta. The arguments allow selecting only a subset of histograms for | 32 // delta. The arguments allow selecting only a subset of histograms for |
33 // recording, or to set a flag in each recorded histogram. | 33 // recording, or to set a flag in each recorded histogram. |
34 void PrepareDeltas(Histogram::Flags flags_to_set, bool record_only_uma); | 34 void PrepareDeltas(HistogramBase::Flags flags_to_set, bool record_only_uma); |
35 | 35 |
36 private: | 36 private: |
37 // Snapshot this histogram, and record the delta. | 37 // Snapshot this histogram, and record the delta. |
38 void PrepareDelta(const Histogram& histogram); | 38 void PrepareDelta(const HistogramBase& histogram); |
39 | 39 |
40 // Try to detect and fix count inconsistency of logged samples. | 40 // Try to detect and fix count inconsistency of logged samples. |
41 void InspectLoggedSamplesInconsistency( | 41 void InspectLoggedSamplesInconsistency( |
42 const HistogramSamples& new_snapshot, | 42 const HistogramSamples& new_snapshot, |
43 HistogramSamples* logged_samples); | 43 HistogramSamples* logged_samples); |
44 | 44 |
45 // For histograms, track what we've already recorded (as a sample for | 45 // For histograms, track what we've already recorded (as a sample for |
46 // each histogram) so that we can record only the delta with the next log. | 46 // each histogram) so that we can record only the delta with the next log. |
47 std::map<std::string, HistogramSamples*> logged_samples_; | 47 std::map<std::string, HistogramSamples*> logged_samples_; |
48 | 48 |
49 // List of histograms found to be corrupt, and their problems. | 49 // List of histograms found to be corrupt, and their problems. |
50 std::map<std::string, int> inconsistencies_; | 50 std::map<std::string, int> inconsistencies_; |
51 | 51 |
52 // |histogram_flattener_| handles the logistics of recording the histogram | 52 // |histogram_flattener_| handles the logistics of recording the histogram |
53 // deltas. | 53 // deltas. |
54 HistogramFlattener* histogram_flattener_; // Weak. | 54 HistogramFlattener* histogram_flattener_; // Weak. |
55 | 55 |
56 DISALLOW_COPY_AND_ASSIGN(HistogramSnapshotManager); | 56 DISALLOW_COPY_AND_ASSIGN(HistogramSnapshotManager); |
57 }; | 57 }; |
58 | 58 |
59 } // namespace base | 59 } // namespace base |
60 | 60 |
61 #endif // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ | 61 #endif // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ |
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