Re: HttPrevayler
Klaus Wuestefeld <[email protected]>
| Newsgroups | gmane.comp.java.prevayler |
|---|---|
| Message-ID | <[email protected]> |
> If I understood this correctly, it won't be possible to take snapshots > and eventually that would mean a long start-up time. You are right. We are planning of defining an http request that HttPrevayler, the journaling reverse-proxy, on startup, can send to the web app and ask it: "Web app, what is the last transaction id you have?" The web app would only be in charge of doing the snapshot then, which is a much simpler task (trivial on Java and .NET) than creating the transaction classes and using them. Ralph Johnson, co-author of "Design-Patterns", has reported on this list about a system of his that is in use for years only with the transaction log and no snapshots. He had a relatively low transaction rate, of course. > Also, although it is transparent the app must still be a deterministic system. Sure. Klaus. ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ To unsubscribe go to the end of this page: http://lists.sourceforge.net/lists/listinfo/prevayler-discussion _______________________________________________ "Databases in Memoriam" -- http://www.prevayler.org