NOT FOR REVIEW - Slow Reports Reference Implementation

base/metrics/histogram_base.h

 // Copyright (c) 2012 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 BASE_METRICS_HISTOGRAM_BASE_H_
 #define BASE_METRICS_HISTOGRAM_BASE_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/basictypes.h"
+#include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_piece.h"
 #include "base/time/time.h"
 
 class Pickle;
 class PickleIterator;
 
 namespace base {
 
 class DictionaryValue;
@@ skipping 112 matching lines @@
 
   // The following methods provide graphical histogram displays.
   virtual void WriteHTMLGraph(std::string* output) const = 0;
   virtual void WriteAscii(std::string* output) const = 0;
 
   // Produce a JSON representation of the histogram. This is implemented with
   // the help of GetParameters and GetCountAndBucketData; overwrite them to
   // customize the output.
   void WriteJSON(std::string* output) const;
 
+  typedef base::Callback<void(void)> ModifiedCallback;
+  void SetCallback(const ModifiedCallback&);
+
  protected:
   // Subclasses should implement this function to make SerializeInfo work.
   virtual bool SerializeInfoImpl(Pickle* pickle) const = 0;
 
   // Writes information about the construction parameters in |params|.
   virtual void GetParameters(DictionaryValue* params) const = 0;
 
   // Writes information about the current (non-empty) buckets and their sample
   // counts to |buckets|, the total sample count to |count| and the total sum
   // to |sum|.
   virtual void GetCountAndBucketData(Count* count,
                                      int64* sum,
                                      ListValue* buckets) const = 0;
 
   //// Produce actual graph (set of blank vs non blank char's) for a bucket.
   void WriteAsciiBucketGraph(double current_size,
                              double max_size,
                              std::string* output) const;
 
   // Return a string description of what goes in a given bucket.
   const std::string GetSimpleAsciiBucketRange(Sample sample) const;
 
   // Write textual description of the bucket contents (relative to histogram).
   // Output is the count in the buckets, as well as the percentage.
   void WriteAsciiBucketValue(Count current,
                              double scaled_sum,
                              std::string* output) const;
 
+  ModifiedCallback callback_;
+
  private:
   const std::string histogram_name_;
   int32_t flags_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramBase);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_BASE_H_