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// Copyright (c) 2006-2008 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/renderer/renderer_histogram_snapshots.h"
#include <ctype.h>
#include "base/histogram.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "base/pickle.h"
#include "chrome/common/render_messages.h"
#include "chrome/renderer/render_process.h"
#include "chrome/renderer/render_thread.h"
// TODO(raman): Before renderer shuts down send final snapshot lists.
RendererHistogramSnapshots::RendererHistogramSnapshots()
: ALLOW_THIS_IN_INITIALIZER_LIST(
renderer_histogram_snapshots_factory_(this)) {
}
// Send data quickly!
void RendererHistogramSnapshots::SendHistograms(int sequence_number) {
RenderThread::current()->message_loop()->PostTask(FROM_HERE,
renderer_histogram_snapshots_factory_.NewRunnableMethod(
&RendererHistogramSnapshots::UploadAllHistrograms, sequence_number));
}
void RendererHistogramSnapshots::UploadAllHistrograms(int sequence_number) {
StatisticsRecorder::Histograms histograms;
StatisticsRecorder::GetHistograms(&histograms);
HistogramPickledList pickled_histograms;
for (StatisticsRecorder::Histograms::iterator it = histograms.begin();
histograms.end() != it;
it++) {
(*it)->SetFlags(Histogram::kIPCSerializationSourceFlag);
UploadHistrogram(**it, &pickled_histograms);
}
// Send the sequence number and list of pickled histograms over synchronous
// IPC.
RenderThread::current()->Send(
new ViewHostMsg_RendererHistograms(
sequence_number, pickled_histograms));
}
// Extract snapshot data and then send it off the the Browser process
// to save it.
void RendererHistogramSnapshots::UploadHistrogram(
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();
// Find the already sent stats, or 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) {
UploadHistogramDelta(histogram, snapshot, pickled_histograms);
// Add new data into our running total.
already_logged->Add(snapshot);
}
}
void RendererHistogramSnapshots::UploadHistogramDelta(
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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