1 files changed, 46 insertions, 0 deletions
diff --git a/net/disk_cache/stats_histogram.h b/net/disk_cache/stats_histogram.h
new file mode 100644
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--- /dev/null
+++ b/net/disk_cache/stats_histogram.h
@@ -0,0 +1,46 @@
+// Copyright (c) 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.
+
+#ifndef NET_DISK_CACHE_STATS_HISTOGRAM_H_
+#define NET_DISK_CACHE_STATS_HISTOGRAM_H_
+
+#include "base/histogram.h"
+
+namespace disk_cache {
+
+class Stats;
+
+// This class provides support for sending the disk cache size stats as a UMA
+// histogram. We'll provide our own storage and management for the data, and a
+// SampleSet with a copy of our data.
+class StatsHistogram : public Histogram {
+ public:
+  class StatsSamples : public SampleSet {
+   public:
+    Counts* GetCounts() {
+      return &counts_;
+    }
+  };
+
+  explicit StatsHistogram(const wchar_t* name)
+      : Histogram(name, 1, 1, 2), init_(false) {}
+  ~StatsHistogram();
+
+  // We'll be reporting data from the given set of cache stats.
+  bool Init(const Stats* stats);
+
+  virtual Sample ranges(size_t i) const;
+  virtual size_t bucket_count() const;
+  virtual void SnapshotSample(SampleSet* sample) const;
+
+ private:
+  bool init_;
+  static const Stats* stats_;
+  DISALLOW_COPY_AND_ASSIGN(StatsHistogram);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_STATS_HISTOGRAM_H_
+