Re: [Zope-dev] MountedFileStorage

2001-01-19 Thread Johan Carlsson


   http://www.zope.org/Members/hathawsh/ExternalMount
  
  
  Sound interesting.
  Is it possible to mount a read-only database from several different Zope-clients?
 
 Yes.  The database should be inside a ZEO storage server.  ExternalMount
 can mount ZEO ClientStorages (that's how www.zope.org/Wikis works) and
 AFAIK you have the opportunity to provide a "read-only" parameter to the
 storage or the database.
 
 In fact, when you mix in ZEO you can mount the database on one client
 while using it as the root database on another client.  That way you can
 get around the lack of undo.

Is it possible to mix a local storage (a filestorage as the root) and mount a ZEO
server storage as a "mounted storage".

What I really want is several independent Zope servers sharing a mounted
database (containing shared resources, eg. template files, design elements etc.). 
If that is possible I suppose it could be either read-write or read-only.
In that way all clients could share an application, for instance a webbshop or
a user tracking application or a browser tracking application.

Cheers,
Johan Carlsson



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Re: [Zope-dev] MountedFileStorage

2001-01-19 Thread Shane Hathaway

Johan Carlsson wrote:
 Is it possible to mix a local storage (a filestorage as the root) and mount a ZEO
 server storage as a "mounted storage".

Yes.  It's pretty straightforward.

 What I really want is several independent Zope servers sharing a mounted
 database (containing shared resources, eg. template files, design elements etc.).
 If that is possible I suppose it could be either read-write or read-only.
 In that way all clients could share an application, for instance a webbshop or
 a user tracking application or a browser tracking application.

Tell me how it turns out!

Shane

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Re: [Zope-dev] MountedFileStorage

2001-01-18 Thread Shane Hathaway

Steve Alexander wrote:
 
 I've just been trying out the MountedFileStorage product (by Anthony
 Baxter) with Zope 2.3.
 
 I've got it mostly working, by patching a couple of typos, and making
 the SubApplication class derive from Traversable before Application.
 
 I've *almost* got ZClasses defined in the root storage working in a
 mounted storage, but there are still a few issues there.
 
 What product is DC using for the mounted storages on zope.org? Can I get
 a copy of it?

http://www.zope.org/Members/hathawsh/ExternalMount

ExternalMount is simpler and more flexible than MountedFileStorage. 
However, a feature of MountedFileStorage is that it lets you try to
mount the root of a ZODB.  For various reasons, that is a Bad Idea. 
That's why it has all the "subapplication" stuff, which ExternalMount
doesn't need because it won't let you mount the root of a ZODB.

Instead, you mount a subobject.  The application object in Wikis.fs on
zope.org contains a folder called "Wikis".  That folder is what gets
mounted; whatever else is in Wikis.fs (like a Control_Panel, an
acl_users, etc) is ignored.

I think you'll find that if you set up your mounted databases this way,
you'll get the reliability you're looking for.

 I don't see any undo records for objects in the mounted storage. It is a
 FileStorage, so I reckon they should be there.

Currently, undo and mounted databases don't mix.  You can only undo
transactions on the root database.  Besides that, there's the problem of
coordinating the undo of transactions that span multiple
databases--should it be done and how?

Mounted databases are interesting and, for the most part, robust, but
they aren't fully integrated with some of Zope's capabilities yet.

Shane

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Re: [Zope-dev] MountedFileStorage

2001-01-18 Thread Johan Carlsson

 
 http://www.zope.org/Members/hathawsh/ExternalMount
 

Sound interesting.
Is it possible to mount a read-only database from several different Zope-clients?

Regards,
Johan 



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Re: [Zope-dev] MountedFileStorage

2001-01-18 Thread Shane Hathaway

Johan Carlsson wrote:
 
 
  http://www.zope.org/Members/hathawsh/ExternalMount
 
 
 Sound interesting.
 Is it possible to mount a read-only database from several different Zope-clients?

Yes.  The database should be inside a ZEO storage server.  ExternalMount
can mount ZEO ClientStorages (that's how www.zope.org/Wikis works) and
AFAIK you have the opportunity to provide a "read-only" parameter to the
storage or the database.

In fact, when you mix in ZEO you can mount the database on one client
while using it as the root database on another client.  That way you can
get around the lack of undo.

Shane

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