Fastream Technologies wrote: > On Sun, Dec 4, 2011 at 11:05, Arno Garrels <arno.garr...@gmx.de> > wrote: > >> ----- Original Message ----- >> From: "Fastream Technologies" <ga...@fastream.com> >> To: "ICS support mailing" <twsocket@elists.org> >> Sent: Sunday, December 04, 2011 7:16 AM >> Subject: Re: [twsocket] Converting a cache to AVL tree >> >> >>> The component I tried to use is TCacheTree. It has a timeout >>> argument for each added item. I do not want any timers or any >>> timeouts yet liked the component. Is there a way to omit >>> expiration. I will use my own code for it. >> >> TCacheTree doesn't use any timer, it just provides two TDateTime >> fields. There are two indices, first is Key of type string, second >> is TimeStamp of type TDateTime used to find oldest entries very >> fast. It's two linked AVL trees. >> >> procedure Insert( >> Key : String; // Unique key >> Data : Pointer; // Pointer to data >> Len : Integer; // Optionally data size >> TimeStamp : TDateTime = MinDT; // Second key (dups are allowed >> and handled) >> Expires : TDateTime = MinDT; // What ever you like >> UpdateTime : Boolean = True; // Shall the TDateTime fields be >> updated? >> UpdateData : Boolean = True); // Shall Data be updated? >> >> Use Insert() for both add and update an entry. >> >> Node : TCacheNode; >> begin >> Node := FCacheTree.FindKey(Key); >> if Node <> nil then >> begin >> // Node.IdxRef.TimeStamp // i.e read the TimeStamp >> // i.e update TimeStamp and Expires, don't update Data >> FCacheTree.Insert(Key, nil, 0, time1, time2, TRUE, FALSE); >> end; >> >> Oldest() returns oldest entry. >> Flush() removes all entries older or same DateTime as passed. >> >> Hope this helps. >> >> -- >> Arno Garrels >> >> >> > > Critical question: Node.IdxRef.TimeStamp = updatedDate;
You can't assign a value, property TimeStamp is read-only. > Would this work? Because we may have duplicates... Use Insert() as described above to update the TimeStamp value. Yes, TimeStamp duplicates are allowed. -- Arno Garrels > > Regards, > > SZ -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
