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
9namespace 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.
23void 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
42