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// Copyright (c) 2011 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.
#ifndef CHROME_FRAME_HISTOGRAM_SNAPSHOTS_H_
#define CHROME_FRAME_HISTOGRAM_SNAPSHOTS_H_
#include <map>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram.h"
#include "base/process.h"
#include "base/synchronization/lock.h"
#include "base/task.h"
// This class gathers histogram data in the host browser process and
// serializes the data into a vector of strings to be uploaded to the
// Chrome browser process. It records the histogram data which has been
// logged and only uploads the delta with the next log.
// TODO(iyengar)
// This class does not contain any ChromeFrame specific stuff. It should
// be moved to base.
class ChromeFrameHistogramSnapshots {
public:
// Maintain a map of histogram names to the sample stats we've sent.
typedef std::map<std::string, base::Histogram::SampleSet> LoggedSampleMap;
typedef std::vector<std::string> HistogramPickledList;
ChromeFrameHistogramSnapshots();
~ChromeFrameHistogramSnapshots() {}
// Extract snapshot data and return it to be sent off to the Chrome browser
// process.
// Return only a delta to what we have already sent.
HistogramPickledList GatherAllHistograms();
private:
void GatherHistogram(const base::Histogram& histogram,
HistogramPickledList* histograms);
void GatherHistogramDelta(const base::Histogram& histogram,
const base::Histogram::SampleSet& snapshot,
HistogramPickledList* histograms);
// For histograms, record what we've already logged (as a sample for each
// histogram) so that we can send only the delta with the next log.
LoggedSampleMap logged_samples_;
// Synchronizes the histogram gathering operation.
base::Lock lock_;
DISALLOW_COPY_AND_ASSIGN(ChromeFrameHistogramSnapshots);
};
#endif // CHROME_RENDERER_HISTOGRAM_SNAPSHOTS_H_
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