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// 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() {
StatisticsRecorder::Histograms histograms;
StatisticsRecorder::GetHistograms(&histograms);
HistogramPickledList pickled_histograms;
for (StatisticsRecorder::Histograms::iterator it = histograms.begin();
histograms.end() != it;
it++) {
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);
}
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