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From Emmanuel Lecharny <elecha...@apache.org>
Subject [schema refactoring] Disbaled schema issues
Date Mon, 28 Sep 2009 23:48:04 GMT
Hi,

another problem I'm currently facing, and can't simply fix : when a 
schema is disabled, it must still be loaded into the server as we should 
allow users to enable it using a simple Ldap Modify request (changing 
its m-disabled AT). Another aspect of the story is that if we want to 
enable a schema globally, we must have a list of all its SchemaObjects 
available, and this structure is build on startup.

Now, the big problem is that when loading the schema on startup, we have 
to check that the AT, MR, OC... are correct (ie, all the OC's 
attributeType are present in the server, for instance). We are using the 
registries for that purpose, but sadly, if an element is disabled, it is 
not present inits registry, and the next step fails.

An option would be not to check the SchemaObject structure when loading 
them (either at startup or when the element is injected into the 
server), but to do it when enabling the element (or disabling, as it may 
impact some other elements). We do that on Studio, checking the whole 
loaded schema after every operation : costly.

Using the 'isEnabled' flag present in each SchemaObject would be 
overkilling, assuming that the registries contain all the SchemaObject, 
enabled or not : it will have to be done for every search request, in 
the SchemaInterceptor. Simply unaceptable.

An easier possible option would probably to have to sets of registries : 
one with the enabled SchemaObject and another one with the disabled 
SchemaObject. That would have an impact on the way the schema is 
handled, as we will have to update either one or the other structure, 
and we also will have to check on both registries when checking the 
SchemaObjects.  That's a lot of code too.

We can also use a shadow registries, containing all the schemaObject, 
but only used by the schema subsystem. A bit of duplication...

any thought before I make a choice ?

-- 
--
cordialement, regards,
Emmanuel L├ęcharny
www.iktek.com
directory.apache.org



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