Improve the way Schema are loaded
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Key: DIRSERVER-883
URL: https://issues.apache.org/jira/browse/DIRSERVER-883
Project: Directory ApacheDS
Issue Type: Improvement
Affects Versions: 1.5.0
Reporter: Emmanuel Lecharny
Fix For: 1.5.1


As far as I understand the way schema are loaded into 1.5.0 version of the s
erver, we can improve it to be more versatile.

We have 5 kind of elements which are part of the schema repository :
1) mandatory elements, like ObjectClass, Top, Name, Desc, any objects withou
t which the server can't load a schema.
2) meta-schema elements, which are used to declare a new schema
3) core schemas, like Core, System, ApacheDs, which are loaded first
4) Extension schema, like Samba, Nis, etc.
5) User defined schema

Right now, we have a bootstrap sequence which is quite complicated :
1) the server is started, and declare the mandatory elements
2) The metaSchema is loaded, with the core schema, from some generated Java 
classes (the schema are only used when compiling the server, to generate tho
se Java classes)
3) The extended classes are loaded from some generated partition (there is a
 file named DBFILES which contains the list of all the backend files, files 
which will be created when compiling the server from the generated Java clas
ses)
4) the server is available.

IMO, we can do the bootsrap differently :
1) server startup : we load the mandatory elements
2-a) if this is the first time the server is started, load the Ldif files re
presenting the MetaSchema, and all the other Ldif files, so that the cn=sche
ma partition is fed with the base and extended schema
2-b) if the schema is already loaded, do nothing except if we have one file 
which date is younger than the last modification date in the cn=schema parti
tion.

The list of schema ldif  files will be stored into the server.xml file, assu
ming that the order must be corect (we must load core.schema before any othe
r shcema, etc.)

This process will be much simpler and easier to modify than the first one, a
nd we will be able to remove some projects and plugins, like the apacheds-bo
otsrap-schema and apacheds-schema-extra projects.

Not sure I'm totally right...

Wdyt ?

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