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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_SAMPLES_H_ | 5 #ifndef BASE_METRICS_HISTOGRAM_SAMPLES_H_ |
6 #define BASE_METRICS_HISTOGRAM_SAMPLES_H_ | 6 #define BASE_METRICS_HISTOGRAM_SAMPLES_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 #include <stdint.h> | 9 #include <stdint.h> |
10 | 10 |
11 #include "base/atomicops.h" | 11 #include "base/atomicops.h" |
12 #include "base/macros.h" | 12 #include "base/macros.h" |
13 #include "base/memory/scoped_ptr.h" | 13 #include "base/memory/scoped_ptr.h" |
14 #include "base/metrics/histogram_base.h" | 14 #include "base/metrics/histogram_base.h" |
15 | 15 |
16 namespace base { | 16 namespace base { |
17 | 17 |
18 class Pickle; | 18 class Pickle; |
19 class PickleIterator; | 19 class PickleIterator; |
20 class SampleCountIterator; | 20 class SampleCountIterator; |
21 | 21 |
22 // HistogramSamples is a container storing all samples of a histogram. All | 22 // HistogramSamples is a container storing all samples of a histogram. All |
23 // elements must be of a fixed width to ensure 32/64-bit interoperability. | 23 // elements must be of a fixed width to ensure 32/64-bit interoperability. |
24 // If this structure changes, bump the version number for kTypeIdHistogram | 24 // If this structure changes, bump the version number for kTypeIdHistogram |
25 // in histogram_persistence.cc. | 25 // in persistent_histogram_allocator.cc. |
26 class BASE_EXPORT HistogramSamples { | 26 class BASE_EXPORT HistogramSamples { |
27 public: | 27 public: |
28 struct Metadata { | 28 struct Metadata { |
29 // Initialized when the sample-set is first created with a value provided | 29 // Initialized when the sample-set is first created with a value provided |
30 // by the caller. It is generally used to identify the sample-set across | 30 // by the caller. It is generally used to identify the sample-set across |
31 // threads and processes, though not necessarily uniquely as it is possible | 31 // threads and processes, though not necessarily uniquely as it is possible |
32 // to have multiple sample-sets representing subsets of the data. | 32 // to have multiple sample-sets representing subsets of the data. |
33 uint64_t id; | 33 uint64_t id; |
34 | 34 |
35 // The sum of all the entries, effectivly the sum(sample * count) for | 35 // The sum of all the entries, effectivly the sum(sample * count) for |
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112 | 112 |
113 // Get the index of current histogram bucket. | 113 // Get the index of current histogram bucket. |
114 // For histograms that don't use predefined buckets, it returns false. | 114 // For histograms that don't use predefined buckets, it returns false. |
115 // Requires: !Done(); | 115 // Requires: !Done(); |
116 virtual bool GetBucketIndex(size_t* index) const; | 116 virtual bool GetBucketIndex(size_t* index) const; |
117 }; | 117 }; |
118 | 118 |
119 } // namespace base | 119 } // namespace base |
120 | 120 |
121 #endif // BASE_METRICS_HISTOGRAM_SAMPLES_H_ | 121 #endif // BASE_METRICS_HISTOGRAM_SAMPLES_H_ |
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