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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.
+
+#ifndef CHROME_FRAME_HISTOGRAM_SNAPSHOTS_H_
+#define CHROME_FRAME_HISTOGRAM_SNAPSHOTS_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/histogram.h"
+#include "base/process.h"
+#include "base/scoped_ptr.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, 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 Histogram& histogram,
+ HistogramPickledList* histograms);
+
+ void GatherHistogramDelta(const Histogram& histogram,
+ const 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_;
+
+ DISALLOW_COPY_AND_ASSIGN(ChromeFrameHistogramSnapshots);
+};
+
+#endif // CHROME_RENDERER_HISTOGRAM_SNAPSHOTS_H_