net/base/connection_type_histograms.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/base/connection_type_histograms.h"
   6
   7 #include "base/metrics/histogram.h"
   8
   9 namespace net {
  10
  11 // We're using a histogram as a group of counters.  We're only interested in
  12 // the values of the counters.  Ignore the shape, average, and standard
  13 // deviation of the histograms because they are meaningless.
  14 //
  15 // We use two groups of counters.  In the first group (counter1), each counter
  16 // is a boolean (0 or 1) that indicates whether the user has seen a connection
  17 // of that type during that session.  In the second group (counter2), each
  18 // counter is the number of connections of that type the user has seen during
  19 // that session.
  20 //
  21 // Each histogram has an unused bucket at the end to allow seamless future
  22 // expansion.
  23 void UpdateConnectionTypeHistograms(ConnectionType type) {
  24   // TODO(wtc): Bug 74467 Move these stats up to a higher level.
  25   static bool had_connection_type[NUM_OF_CONNECTION_TYPES];  // Default false.
  26
  27   if (type >= 0 && type < NUM_OF_CONNECTION_TYPES) {
  28     if (!had_connection_type[type]) {
  29       had_connection_type[type] = true;
  30       UMA_HISTOGRAM_ENUMERATION("Net.HadConnectionType3",
  31           type, NUM_OF_CONNECTION_TYPES);
  32     }
  33
  34     UMA_HISTOGRAM_ENUMERATION("Net.ConnectionTypeCount3",
  35         type, NUM_OF_CONNECTION_TYPES);
  36   } else {
  37     NOTREACHED();  // Someone's logging an invalid type!
  38   }
  39 }
  40
  41 }  // namespace net