dom/quota/ScopedLogExtraInfo.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef DOM_QUOTA_SCOPEDLOGEXTRAINFO_H_
   8 #define DOM_QUOTA_SCOPEDLOGEXTRAINFO_H_
   9
  10 #include "mozilla/dom/quota/Config.h"
  11
  12 #include <map>
  13 #include "mozilla/Assertions.h"
  14 #include "mozilla/Attributes.h"
  15 #include "mozilla/ThreadLocal.h"
  16 #include "nsString.h"
  17 #include "nsXULAppAPI.h"
  18
  19 namespace mozilla::dom::quota {
  20
  21 struct MOZ_STACK_CLASS ScopedLogExtraInfo {
  22   static constexpr const char kTagQuery[] = "query";
  23   static constexpr const char kTagContext[] = "context";
  24
  25 #ifdef QM_SCOPED_LOG_EXTRA_INFO_ENABLED
  26  private:
  27   static auto FindSlot(const char* aTag);
  28
  29  public:
  30   template <size_t N>
  31   ScopedLogExtraInfo(const char (&aTag)[N], const nsACString& aExtraInfo)
  32       : mTag{aTag}, mPreviousValue(nullptr), mCurrentValue{aExtraInfo} {
  33     AddInfo();
  34   }
  35
  36   ~ScopedLogExtraInfo();
  37
  38   ScopedLogExtraInfo(ScopedLogExtraInfo&& aOther) noexcept;
  39   ScopedLogExtraInfo& operator=(ScopedLogExtraInfo&& aOther) = delete;
  40
  41   ScopedLogExtraInfo(const ScopedLogExtraInfo&) = delete;
  42   ScopedLogExtraInfo& operator=(const ScopedLogExtraInfo&) = delete;
  43
  44   using ScopedLogExtraInfoMap = std::map<const char*, const nsACString*>;
  45   static ScopedLogExtraInfoMap GetExtraInfoMap();
  46
  47   static void Initialize();
  48
  49  private:
  50   const char* mTag;
  51   const nsACString* mPreviousValue;
  52   nsCString mCurrentValue;
  53
  54   static MOZ_THREAD_LOCAL(const nsACString*) sQueryValue;
  55   static MOZ_THREAD_LOCAL(const nsACString*) sContextValue;
  56
  57   void AddInfo();
  58 #else
  59   template <size_t N>
  60   ScopedLogExtraInfo(const char (&aTag)[N], const nsACString& aExtraInfo) {}
  61
  62   // user-defined to silence unused variable warnings
  63   ~ScopedLogExtraInfo() {}
  64 #endif
  65 };
  66
  67 }  // namespace mozilla::dom::quota
  68
  69 #endif  // DOM_QUOTA_SCOPEDLOGEXTRAINFO_H_