dbus/dbus_statistics.h

   1 // Copyright (c) 2012 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 #ifndef DBUS_DBUS_STATISTICS_H_
   6 #define DBUS_DBUS_STATISTICS_H_
   7
   8 #include <string>
   9
  10 #include "dbus/dbus_export.h"
  11
  12 // The functions defined here are used to gather DBus statistics, and
  13 // provide them in a format convenient for debugging. These functions are only
  14 // valid when called from the main thread (the thread which Initialize() was
  15 // called from). Calls from other threads will be ignored.
  16
  17 namespace dbus {
  18 namespace statistics {
  19
  20 // Enum to specify what level of detail to show in GetAsString
  21 enum ShowInString {
  22   SHOW_SERVICE = 0,  // Service totals only
  23   SHOW_INTERFACE = 1,  // Service + interface totals
  24   SHOW_METHOD = 2,  // Service + interface + method totals
  25 };
  26
  27 // Enum to specify how to format the display in GetAsString
  28 enum FormatString {
  29   FORMAT_TOTALS = 0,  // Raw totals only
  30   FORMAT_PER_MINUTE = 1,  // Per-minute only
  31   FORMAT_ALL = 2  // Include all format details
  32 };
  33
  34 // Initializes / shuts down dbus statistics gathering. Calling Initialize
  35 // more than once will reset the statistics.
  36 CHROME_DBUS_EXPORT void Initialize();
  37 CHROME_DBUS_EXPORT void Shutdown();
  38
  39 // Add sent/received calls to the statistics gathering class. These methods
  40 // do nothing unless Initialize() was called.
  41 CHROME_DBUS_EXPORT void AddSentMethodCall(const std::string& service,
  42                                           const std::string& interface,
  43                                           const std::string& method);
  44 CHROME_DBUS_EXPORT void AddReceivedSignal(const std::string& service,
  45                                           const std::string& interface,
  46                                           const std::string& method);
  47 // Track synchronous calls independently since we want to highlight
  48 // (and remove) these.
  49 CHROME_DBUS_EXPORT void AddBlockingSentMethodCall(const std::string& service,
  50                                                   const std::string& interface,
  51                                                   const std::string& method);
  52
  53 // Output the calls into a formatted string. |show| determines what level
  54 // of detail to show: one line per service, per interface, or per method.
  55 // If |show_per_minute| is true include per minute stats.
  56 // Example output for SHOW_METHOD, FORMAT_TOTALS:
  57 //   org.chromium.Mtpd.EnumerateStorage: Sent: 100
  58 //   org.chromium.Mtpd.MTPStorageSignal: Received: 20
  59 // Example output for SHOW_INTERFACE, FORMAT_ALL:
  60 //   org.chromium.Mtpd: Sent: 100 (10/min) Received: 20 (2/min)
  61 CHROME_DBUS_EXPORT std::string GetAsString(ShowInString show,
  62                                            FormatString format);
  63
  64 namespace testing {
  65 // Sets |sent| to the number of sent calls, |received| to the number of
  66 // received calls, and |blocking| to the number of sent blocking calls for
  67 // service+interface+method. Used in unittests.
  68 CHROME_DBUS_EXPORT bool GetCalls(const std::string& service,
  69                                  const std::string& interface,
  70                                  const std::string& method,
  71                                  int* sent,
  72                                  int* received,
  73                                  int* blocking);
  74 }  // namespace testing
  75
  76 }  // namespace statistics
  77 }  // namespace dbus
  78
  79 #endif  // DBUS_DBUS_STATISTICS_H_