xpcom/ds/nsObserverService.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
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsObserverService_h___
   8 #define nsObserverService_h___
   9
  10 #include "nsIObserverService.h"
  11 #include "nsObserverList.h"
  12 #include "nsIMemoryReporter.h"
  13 #include "nsTHashtable.h"
  14 #include "mozilla/Attributes.h"
  15
  16 // {D07F5195-E3D1-11d2-8ACD-00105A1B8860}
  17 #define NS_OBSERVERSERVICE_CID                      \
  18   {                                                 \
  19     0xd07f5195, 0xe3d1, 0x11d2, {                   \
  20       0x8a, 0xcd, 0x0, 0x10, 0x5a, 0x1b, 0x88, 0x60 \
  21     }                                               \
  22   }
  23
  24 class nsObserverService final : public nsIObserverService,
  25                                 public nsIMemoryReporter {
  26  public:
  27   NS_DECLARE_STATIC_IID_ACCESSOR(NS_OBSERVERSERVICE_CID)
  28
  29   nsObserverService();
  30
  31   NS_DECL_ISUPPORTS
  32   NS_DECL_NSIOBSERVERSERVICE
  33   NS_DECL_NSIMEMORYREPORTER
  34
  35   void Shutdown();
  36
  37   [[nodiscard]] static nsresult Create(const nsIID& aIID, void** aInstancePtr);
  38
  39   // Unmark any strongly held observers implemented in JS so the cycle
  40   // collector will not traverse them.
  41   NS_IMETHOD UnmarkGrayStrongObservers();
  42
  43  private:
  44   ~nsObserverService(void);
  45   void RegisterReporter();
  46   nsresult EnsureValidCall() const;
  47   nsresult FilterHttpOnTopics(const char* aTopic);
  48
  49   static const size_t kSuspectReferentCount = 100;
  50   bool mShuttingDown;
  51   nsTHashtable<nsObserverList> mObserverTopicTable;
  52 };
  53
  54 NS_DEFINE_STATIC_IID_ACCESSOR(nsObserverService, NS_OBSERVERSERVICE_CID)
  55
  56 #endif /* nsObserverService_h___ */