xpcom/ds/nsObserverService.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef nsObserverService_h___
   7 #define nsObserverService_h___
   8
   9 #include "nsIObserverService.h"
  10 #include "nsObserverList.h"
  11 #include "nsIMemoryReporter.h"
  12 #include "nsTHashtable.h"
  13 #include "mozilla/Attributes.h"
  14
  15 // {D07F5195-E3D1-11d2-8ACD-00105A1B8860}
  16 #define NS_OBSERVERSERVICE_CID \
  17     { 0xd07f5195, 0xe3d1, 0x11d2, { 0x8a, 0xcd, 0x0, 0x10, 0x5a, 0x1b, 0x88, 0x60 } }
  18
  19 class nsIMemoryReporter;
  20
  21 class nsObserverService MOZ_FINAL
  22   : public nsIObserverService
  23   , public nsIMemoryReporter
  24 {
  25 public:
  26   NS_DECLARE_STATIC_IID_ACCESSOR(NS_OBSERVERSERVICE_CID)
  27
  28   nsObserverService();
  29
  30   NS_DECL_ISUPPORTS
  31   NS_DECL_NSIOBSERVERSERVICE
  32   NS_DECL_NSIMEMORYREPORTER
  33
  34   void Shutdown();
  35
  36   static nsresult Create(nsISupports* aOuter, const nsIID& aIID,
  37                          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
  47   static const size_t kSuspectReferentCount = 100;
  48   static PLDHashOperator CountReferents(nsObserverList* aObserverList,
  49                                         void* aClosure);
  50   bool mShuttingDown;
  51   nsTHashtable<nsObserverList> mObserverTopicTable;
  52 };
  53
  54 NS_DEFINE_STATIC_IID_ACCESSOR(nsObserverService, NS_OBSERVERSERVICE_CID)
  55
  56 #endif /* nsObserverService_h___ */