| // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome_frame/chrome_frame_histograms.h" |
| |
| #include "base/histogram.h" |
| #include "base/lazy_instance.h" |
| #include "base/logging.h" |
| #include "base/message_loop.h" |
| #include "base/pickle.h" |
| |
| // Initialize histogram statistics gathering system. |
| base::LazyInstance<StatisticsRecorder> |
| g_statistics_recorder_(base::LINKER_INITIALIZED); |
| |
| ChromeFrameHistogramSnapshots::ChromeFrameHistogramSnapshots() { |
| // Ensure that an instance of the StatisticsRecorder object is created. |
| g_statistics_recorder_.Get(); |
| } |
| |
| ChromeFrameHistogramSnapshots::HistogramPickledList |
| ChromeFrameHistogramSnapshots::GatherAllHistograms() { |
| |
| AutoLock auto_lock(lock_); |
| |
| StatisticsRecorder::Histograms histograms; |
| StatisticsRecorder::GetHistograms(&histograms); |
| |
| HistogramPickledList pickled_histograms; |
| |
| for (StatisticsRecorder::Histograms::iterator it = histograms.begin(); |
| histograms.end() != it; |
| it++) { |
| (*it)->SetFlags(Histogram::kIPCSerializationSourceFlag); |
| GatherHistogram(**it, &pickled_histograms); |
| } |
| |
| return pickled_histograms; |
| } |
| |
| void ChromeFrameHistogramSnapshots::GatherHistogram( |
| const Histogram& histogram, |
| HistogramPickledList* pickled_histograms) { |
| |
| // Get up-to-date snapshot of sample stats. |
| Histogram::SampleSet snapshot; |
| histogram.SnapshotSample(&snapshot); |
| const std::string& histogram_name = histogram.histogram_name(); |
| |
| // Check if we already have a log of this histogram and if not create an |
| // empty set. |
| LoggedSampleMap::iterator it = logged_samples_.find(histogram_name); |
| Histogram::SampleSet* already_logged; |
| if (logged_samples_.end() == it) { |
| // Add new entry. |
| already_logged = &logged_samples_[histogram.histogram_name()]; |
| already_logged->Resize(histogram); // Complete initialization. |
| } else { |
| already_logged = &(it->second); |
| // Deduct any stats we've already logged from our snapshot. |
| snapshot.Subtract(*already_logged); |
| } |
| |
| // Snapshot now contains only a delta to what we've already_logged. |
| if (snapshot.TotalCount() > 0) { |
| GatherHistogramDelta(histogram, snapshot, pickled_histograms); |
| // Add new data into our running total. |
| already_logged->Add(snapshot); |
| } |
| } |
| |
| void ChromeFrameHistogramSnapshots::GatherHistogramDelta( |
| const Histogram& histogram, |
| const Histogram::SampleSet& snapshot, |
| HistogramPickledList* pickled_histograms) { |
| |
| DCHECK(0 != snapshot.TotalCount()); |
| snapshot.CheckSize(histogram); |
| |
| std::string histogram_info = |
| Histogram::SerializeHistogramInfo(histogram, snapshot); |
| pickled_histograms->push_back(histogram_info); |
| } |