64   virtual uint32_t GetLength(nsIPrincipal& aSubjectPrincipal,
68                    nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) = 0;
71                        nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) = 0;
76                    nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) {  in NamedGetter()  argument
77     GetItem(aKey, aResult, aSubjectPrincipal, aRv);  in NamedGetter()
82                        nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) = 0;
85                    nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) {  in NamedSetter()  argument
86     SetItem(aKey, aValue, aSubjectPrincipal, aRv);  in NamedSetter()
90                           nsIPrincipal& aSubjectPrincipal,
94                     nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) {  in NamedDeleter()  argument
95     RemoveItem(aKey, aSubjectPrincipal, aRv);  in NamedDeleter()
100   virtual void Clear(nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) = 0;
114   virtual void Open(nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) {}  in Open()  argument
116   virtual void Close(nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv) {}  in Close()  argument
118   virtual void BeginExplicitSnapshot(nsIPrincipal& aSubjectPrincipal,  in BeginExplicitSnapshot()  argument
121   virtual void EndExplicitSnapshot(nsIPrincipal& aSubjectPrincipal,  in EndExplicitSnapshot()  argument
124   virtual bool GetHasSnapshot(nsIPrincipal& aSubjectPrincipal,  in GetHasSnapshot()  argument
129   virtual int64_t GetSnapshotUsage(nsIPrincipal& aSubjectPrincipal,
159   bool CanUseStorage(nsIPrincipal& aSubjectPrincipal);