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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 <stdint.h> | 8 #include <stdint.h> |
9 | 9 |
| 10 #include <atomic> |
10 #include <map> | 11 #include <map> |
11 #include <string> | 12 #include <string> |
12 #include <vector> | 13 #include <vector> |
13 | 14 |
14 #include "base/gtest_prod_util.h" | 15 #include "base/gtest_prod_util.h" |
15 #include "base/macros.h" | 16 #include "base/macros.h" |
16 #include "base/metrics/histogram_base.h" | 17 #include "base/metrics/histogram_base.h" |
17 #include "base/threading/thread_checker.h" | |
18 | 18 |
19 namespace base { | 19 namespace base { |
20 | 20 |
21 class HistogramSamples; | 21 class HistogramSamples; |
22 class HistogramFlattener; | 22 class HistogramFlattener; |
23 | 23 |
24 // HistogramSnapshotManager handles the logistics of gathering up available | 24 // HistogramSnapshotManager handles the logistics of gathering up available |
25 // histograms for recording either to disk or for transmission (such as from | 25 // histograms for recording either to disk or for transmission (such as from |
26 // renderer to browser, or from browser to UMA upload). Since histograms can sit | 26 // renderer to browser, or from browser to UMA upload). Since histograms can sit |
27 // in memory for an extended period of time, and are vulnerable to memory | 27 // in memory for an extended period of time, and are vulnerable to memory |
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69 // The set of inconsistencies (flags) already seen for the histogram. | 69 // The set of inconsistencies (flags) already seen for the histogram. |
70 // See HistogramBase::Inconsistency for values. | 70 // See HistogramBase::Inconsistency for values. |
71 uint32_t inconsistencies = 0; | 71 uint32_t inconsistencies = 0; |
72 }; | 72 }; |
73 | 73 |
74 // Capture and hold samples from a histogram. This does all the heavy | 74 // Capture and hold samples from a histogram. This does all the heavy |
75 // lifting for PrepareDelta() and PrepareAbsolute(). | 75 // lifting for PrepareDelta() and PrepareAbsolute(). |
76 void PrepareSamples(const HistogramBase* histogram, | 76 void PrepareSamples(const HistogramBase* histogram, |
77 std::unique_ptr<HistogramSamples> samples); | 77 std::unique_ptr<HistogramSamples> samples); |
78 | 78 |
| 79 // |histogram_flattener_| handles the logistics of recording the histogram |
| 80 // deltas. |
| 81 HistogramFlattener* const histogram_flattener_; // Weak. |
| 82 |
79 // For histograms, track what has been previously seen, indexed | 83 // For histograms, track what has been previously seen, indexed |
80 // by the hash of the histogram name. | 84 // by the hash of the histogram name. |
81 std::map<uint64_t, SampleInfo> known_histograms_; | 85 std::map<uint64_t, SampleInfo> known_histograms_; |
82 | 86 |
83 // |histogram_flattener_| handles the logistics of recording the histogram | 87 // A flag indicating if a thread is currently doing an operation. This is |
84 // deltas. | 88 // used to check against concurrent access which is not supported. A Thread- |
85 HistogramFlattener* histogram_flattener_; // Weak. | 89 // Checker is not sufficient because it may be guarded by at outside lock |
86 | 90 // (as is the case with cronet). |
87 ThreadChecker thread_checker_; | 91 std::atomic<bool> is_active_; |
88 | 92 |
89 DISALLOW_COPY_AND_ASSIGN(HistogramSnapshotManager); | 93 DISALLOW_COPY_AND_ASSIGN(HistogramSnapshotManager); |
90 }; | 94 }; |
91 | 95 |
92 } // namespace base | 96 } // namespace base |
93 | 97 |
94 #endif // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ | 98 #endif // BASE_METRICS_HISTOGRAM_SNAPSHOT_MANAGER_H_ |
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