1 files changed, 56 insertions, 0 deletions
diff --git a/xpcom/ds/nsObserverService.h b/xpcom/ds/nsObserverService.h
new file mode 100644
index 0000000000..f4e445995b
--- /dev/null
+++ b/xpcom/ds/nsObserverService.h
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsObserverService_h___
+#define nsObserverService_h___
+
+#include "nsIObserverService.h"
+#include "nsObserverList.h"
+#include "nsIMemoryReporter.h"
+#include "nsTHashtable.h"
+#include "mozilla/Attributes.h"
+
+// {D07F5195-E3D1-11d2-8ACD-00105A1B8860}
+#define NS_OBSERVERSERVICE_CID                      \
+  {                                                 \
+    0xd07f5195, 0xe3d1, 0x11d2, {                   \
+      0x8a, 0xcd, 0x0, 0x10, 0x5a, 0x1b, 0x88, 0x60 \
+    }                                               \
+  }
+
+class nsObserverService final : public nsIObserverService,
+                                public nsIMemoryReporter {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_OBSERVERSERVICE_CID)
+
+  nsObserverService();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVERSERVICE
+  NS_DECL_NSIMEMORYREPORTER
+
+  void Shutdown();
+
+  [[nodiscard]] static nsresult Create(const nsIID& aIID, void** aInstancePtr);
+
+  // Unmark any strongly held observers implemented in JS so the cycle
+  // collector will not traverse them.
+  NS_IMETHOD UnmarkGrayStrongObservers();
+
+ private:
+  ~nsObserverService(void);
+  void RegisterReporter();
+  nsresult EnsureValidCall() const;
+  nsresult FilterHttpOnTopics(const char* aTopic);
+
+  static const size_t kSuspectReferentCount = 100;
+  bool mShuttingDown;
+  nsTHashtable<nsObserverList> mObserverTopicTable;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsObserverService, NS_OBSERVERSERVICE_CID)
+
+#endif /* nsObserverService_h___ */