Re: [Prevayler-discussion] Fwd: Large images
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From: Rob W. <r.w...@gm...> - 2006-09-17 06:56:04
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Hi chaps, I would pass something to the prevalent system so that it could be processed. An image is an ideal subject, since the image is passed on further processing, and doesn't exist until you decide what you want it to be. In my object model the image is processed into one of many forms depending on the state of the model. Without knowing the state of the model (which you can't until you get there) you don't know what to do with the image. Hence a set of information is made available to the prevaylent system which it will not end up storing. Sorry chaps but when developing any system you have to think out of the box... However you intend a system to be used, people will want the flexibility to be able to use in any way they want. What's with this control thing :-) projects should liberate not constrain :-) cheers Rob On 16/09/06, Justin T. Sampson <ju...@kr...> wrote: > > On 9/16/06, Klaus Wuestefeld <kla...@gm...> wrote: > > > http://en.wikipedia.org/wiki/Mu_(Japanese_word) > > > > "According to the Jargon File, a collection of hacker jargon and > > culture, Mu (here pronounced "moo") is considered by Discordians to be > > the correct answer to the classic logical fallacy of the loaded > > question "Have you stopped beating your wife?" [...] > > > > Why would you pass something to the prevalent system that you don't > > want persisted? > > Yes. I didn't mean to be flippant, and hope I didn't offend, but that > was the first answer that came to mind, so I offered it in the hope it > might help. :) > > What I'm doing on my current project, which is a photo-processing web > application, is to use a naming convention for the files rather than > storing the filenames. When a photo is uploaded, it is first saved to > "temporary.jpg", and then some metadata is read out of it. Then a > Prevayler transaction is executed, which stashes the metadata and > generates a unique identifier which it associates with the metadata > within the prevalent system. The unique identifier is then returned > from the transaction, and used by the calling code -- outside of > Prevayler -- to rename the file to, say, "0000005283.jpg". At the > moment, the photos directory is about 200 Mbytes, while the Prevayler > snapshot file is about 50 Kbytes. > > Cheers, > Justin > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job > easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > To unsubscribe go to the end of this page: > http://lists.sourceforge.net/lists/listinfo/prevayler-discussion > _______________________________________________ > "Databases in Memoriam" -- http://www.prevayler.org > |