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(nsISupports* aOuter, const nsIID& aIID,
38                                        void** aInstancePtr);
39 
40   // Unmark any strongly held observers implemented in JS so the cycle
41   // collector will not traverse them.
42   NS_IMETHOD UnmarkGrayStrongObservers();
43 
44  private:
45   ~nsObserverService(void);
46   void RegisterReporter();
47   nsresult EnsureValidCall() const;
48   nsresult FilterHttpOnTopics(const char* aTopic);
49 
50   static const size_t kSuspectReferentCount = 100;
51   bool mShuttingDown;
52   nsTHashtable<nsObserverList> mObserverTopicTable;
53 };
54 
55 NS_DEFINE_STATIC_IID_ACCESSOR(nsObserverService, NS_OBSERVERSERVICE_CID)
56 
57 #endif /* nsObserverService_h___ */
58