[Zope] audio order

Aaron aamehl at bezeqint.net
Sat May 22 14:36:31 EDT 2004

Thanks for everyones advice,

I will indeed have massive amount of data to store. I don't envision
massive bandwidth. I also don't envision letting users to actually
download audio files, rather to create playlist to listen to streaming.

After reading the replies I see I have a lot of learning to do before I
get to far afield.


I am now reading about 
On Fri, 2004-05-21 at 19:24, Paul Winkler wrote:
> On Fri, May 21, 2004 at 05:14:54PM +0200, Jerome R. Westrick wrote:
> > Basically. the way I see it is as follows:
> > 
> > In Zope I implent my Objects (if I'm using that model)
> > 
> > In Zope I implement my seperation of "Display code" and "application
> > code".
> > 
> > In my last project I tried to keep the database mostly read only,
> > and stored all data in postgress.  I had applicational reasons for this
> > but it also worked out rather well, having code in Zope and Data in PG.
> > 
> > In a preveous project, I stored PDF's in the Zope DB.  This is
> > definatetly a mistake, which causes problems with an Over fulled Zope DB
> > holding a history of PDFs for nothing.
> *shrug* there are a lot of options there.
> It is now possible to "mount" multiple databases in one Zope instance.
> So all the audio files could go in a dedicated ZODB - something
> capable of scaling to many GB of data, so I'd probably
> choose DirectoryStorage.  Activity in this database wouldn't affect
> any other zope data.  And you could pack it however often you like.
> Re. some of the earlier comments:
> > On Fri, 2004-05-21 at 08:04, Aaron wrote:
> > > On Fri, 2004-05-21 at 03:02, Jerome R. Westrick wrote:
> > > > Hi Aaron...
> > > > 
> > > > I wouldn't place the songs in Zope...
> > > > Instead I would use LocalFS to get access to them...
> At one time I would have agreed, to keep the ZODB from getting
> unwieldy; but nowadays, unless I had another reason that I wanted
> the files easily accessible as plain files on the filesystem, I 
> would just use DirectoryStorage instead. It's robust, and given 
> an appropriate filesystem it can handle really massive amounts of data, 
> and it's easier to set up than fiddling around with LocalFS
> or ExternalFile or whatever.
> Download speed of blobs is still an issue. 
> Note that the commonly deployed versions of LocalFS and many other 
> attempts at keeping Zope data on the filesystem actually perform MUCH
> worse than the normal ZODB-based File class.
> I would handle the speed issue by throwing massive amounts of 
> disk caching at the problem. If the content is anonymously 
> downloadable I'd use Squid or apache + caching; if not, I'd use the 
> FileCacheManager that we hacked up at Pycon. 
> And if using ZEO, I'd use an enormous ZEO client cache.
> For more background on blobs in zope, see:
> http://www.slinkp.com/code/zopestuff/blobnotes
> Sure, you could end up eating several times the size of your data set
> for all these disk caches... but who cares?
> At roughly a dollar per gigabyte, buying more disk space is a much
> better investment than spending even an hour worrying about it.
> > > Would I use the zope db to keep track of the audio or a relational db?
> If it were me, regardless of where the data is stored, I would use 
> zope's Catalog to provide searching and browsing capabilities based 
> on metadata. But I guess it depends on what kind of queries you 
> need to be able to do. The Catalog is pretty flexible, but probably
> not as flexible as a full-blown query language (SQL).
> To get an idea of what zope's catalog can do, take a look at plone.org.
> The front page uses the catalog for all the cool stuff on the right:
> * the Search feature
> * the News portlet to the right
> * the Upcoming Events portlet 
> * the Calendar at lower right
> > > My question Is generally more generic, what advantage does zope give me
> > > over another solution.
> It's just a different way of working / thinking.
> Once you have some understanding of zope, you can work pretty darn fast.
> And it allows you to cleanly separate business logic from
> presentation code and from content (although many
> people do not do so).

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