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Side by Side Diff: content/browser/histogram_synchronizer.h

Issue 11340029: Move remaining files in content\browser to the content namespace. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 8 years, 1 month ago
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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 CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_ 5 #ifndef CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
6 #define CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_ 6 #define CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
7 7
8 #include <string> 8 #include <string>
9 #include <vector> 9 #include <vector>
10 10
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42 // There is one final mode of use, where a renderer spontaneously decides to 42 // There is one final mode of use, where a renderer spontaneously decides to
43 // transmit a collection of histogram data. This is designed for use when the 43 // transmit a collection of histogram data. This is designed for use when the
44 // renderer is terminating. Unfortunately, renders may be terminated without 44 // renderer is terminating. Unfortunately, renders may be terminated without
45 // warning, and the best we can do is periodically acquire data from a tab, such 45 // warning, and the best we can do is periodically acquire data from a tab, such
46 // as when a page load has completed. In this mode, the renderer uses a 46 // as when a page load has completed. In this mode, the renderer uses a
47 // reserved sequence number, different from any sequence number that might be 47 // reserved sequence number, different from any sequence number that might be
48 // specified by a browser request. Since this sequence number can't match an 48 // specified by a browser request. Since this sequence number can't match an
49 // outstanding sequence number, the pickled data is accepted into the browser, 49 // outstanding sequence number, the pickled data is accepted into the browser,
50 // but there is no impact on the counters. 50 // but there is no impact on the counters.
51 51
52 class HistogramSynchronizer : public content::HistogramSubscriber { 52 class HistogramSynchronizer : public HistogramSubscriber {
53 public: 53 public:
54 enum ProcessHistogramRequester { 54 enum ProcessHistogramRequester {
55 UNKNOWN, 55 UNKNOWN,
56 ASYNC_HISTOGRAMS, 56 ASYNC_HISTOGRAMS,
57 }; 57 };
58 58
59 // Return pointer to the singleton instance for the current process, or NULL 59 // Return pointer to the singleton instance for the current process, or NULL
60 // if none. 60 // if none.
61 static HistogramSynchronizer* GetInstance(); 61 static HistogramSynchronizer* GetInstance();
62 62
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142 // The sequence number used by the most recent asynchronous update request to 142 // The sequence number used by the most recent asynchronous update request to
143 // contact all processes. 143 // contact all processes.
144 int async_sequence_number_; 144 int async_sequence_number_;
145 145
146 DISALLOW_COPY_AND_ASSIGN(HistogramSynchronizer); 146 DISALLOW_COPY_AND_ASSIGN(HistogramSynchronizer);
147 }; 147 };
148 148
149 } // namespace content 149 } // namespace content
150 150
151 #endif // CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_ 151 #endif // CONTENT_BROWSER_HISTOGRAM_SYNCHRONIZER_H_
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