net/ftp/ftp_server_type_histograms.cc

   1 // Copyright (c) 2009 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/ftp/ftp_server_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, with one bucket for each
  12 // enumeration value.  We're only interested in the values of the counters.
  13 // Ignore the shape, average, and standard deviation of the histograms because
  14 // they are meaningless.
  15 //
  16 // We use two histograms.  In the first histogram we tally whether the user has
  17 // seen an FTP server of a given type during that session.  In the second
  18 // histogram we tally the number of transactions with FTP server of a given type
  19 // the user has made during that session.
  20 void UpdateFtpServerTypeHistograms(FtpServerType type) {
  21   static bool had_server_type[NUM_OF_SERVER_TYPES];
  22   if (type >= 0 && type < NUM_OF_SERVER_TYPES) {
  23     if (!had_server_type[type]) {
  24       had_server_type[type] = true;
  25       UMA_HISTOGRAM_ENUMERATION("Net.HadFtpServerType2",
  26                                 type, NUM_OF_SERVER_TYPES);
  27     }
  28   }
  29   UMA_HISTOGRAM_ENUMERATION("Net.FtpServerTypeCount2",
  30                             type, NUM_OF_SERVER_TYPES);
  31 }
  32
  33 }  // namespace net