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From "Norval Hope (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DIRSERVER-760) reading .schema files at server start-up
Date Thu, 02 Nov 2006 03:24:17 GMT
    [ http://issues.apache.org/jira/browse/DIRSERVER-760?page=comments#action_12446439 ] 
            
Norval Hope commented on DIRSERVER-760:
---------------------------------------

No problem, always trying to help.

Here are the answers to your questions:
1) no classes are generated, I just parse the .schema file and create the same objects that
the Maven plugin-generated code would when run.
2) N/A
3) Dependencies are handled by simple ordering (ala Unix init tasks) rather then explicit
statement of dependencies. Hence a core schema needs to appear before one that relies on it.
Two methods are currently supported: 1) reading list of files explicitly named in server.xml
or 2) read alpha-sorted list of files matching a regex in a named directory (in which case
file names need to be chosen carefully so dependency ordering is respected).

The per-partition schema concept is one of my target use-cases and I included some extra code
which can contribute schema information for an external directory server via standard LDAP
querying it. The problem I had when running it was that contributing content to the global
registries after startup had no effect as the it seems the bootstrap registries were always
used. In the past I had a hack which got around this problem but is stopped working three
months or so ago and I haven't bothered revisting it.

Two points remain that I'm not clear on:
a) Whether my proposed patch needs further thought in the "embedded" ADS use-case 
b) Whether syntax defs and matching rule defs are as dynamic as attribute types and object
classes. OpenLdapSchemaParser doesn't have any methods returning them as it does for attr
types/object classes so I presume they are simply deduced via "create on reference" or something
like that. My current code ignores them (assuming they have all been defined via the Maven
generated code), but will be easily updated once I know what to do.

Thanks for the PS too. I completely understand, but at the same time was expecting at least
a glimmer of interest ;-)

> reading .schema files at server start-up
> ----------------------------------------
>
>                 Key: DIRSERVER-760
>                 URL: http://issues.apache.org/jira/browse/DIRSERVER-760
>             Project: Directory ApacheDS
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 1.1.1
>         Environment: N/A
>            Reporter: Norval Hope
>         Attachments: schema_loader.patch
>
>
> I am submitting a patch for a feature I required, and which I've seen a number of queries
about on the DEV list. Currently the only way to get new .schema information into ApacheDS
is to use the Maven2 plugin, requiring a rebuild of the server (not to mention working around
problems like methods being generated which are too long for Java to handle).
> Instead this patch adds support for reading of  specified .schema files from server.xml
at server startup, via a new interface SchemaLoader and a default implementation FileSystemSchemaLoader.
The latter supports reading all files matching a specified regex in a specified directory
(in which case users must be careful to ensure that files appear lexicographically before
their dependant files, ala init.rc in Linux) or reading an ordered list of file names under
a specified directory. An example server.xml snippet is as follows:
>     <property name="bootstrapSchemas">
>       <set>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.AutofsSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.CorbaSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.CoreSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.CosineSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.ApacheSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.CollectiveSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.InetorgpersonSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.JavaSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.Krb5kdcSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.NisSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.SystemSchema"/>
>         <bean class="org.apache.directory.server.core.schema.bootstrap.ApachednsSchema"/>
>       </set>
>     </property>
>     <property name="schemaLoaders">
>         <list>
>             <bean class="org.apache.directory.server.core.schema.FileSystemSchemaLoader">
>                 <constructor-arg><value>./</value></constructor-arg>
>                 <!--<constructor-arg><value>.*_openldap.schema</value></constructor-arg>-->
>                 <constructor-arg>
>                     <list>
>                         <value>my1_openldap.schema</value>
>                         <value>my2_openldap.schema</value>
>                     </list>
>                 </constructor-arg>
>             </bean>
>         </list>
>     </property>
> noting that the Maven2 style approach is of course still supported where desired. A list
is used so that multiple SchemaLoader implementations can be appended if required (which I
do). 
> I have also included SchemaFromSearchConverter which can read a schema from another directory
via conventional query, which may come in useful for people using ApacheDS as a virtual directory
container of sorts. It is not required by the core patch and can be excluded if no generic
use is seen for it.
> A few issues are still outstanding:
>    1. Is the patch seen as worthwhile by the DEV list and/or are there any issues with
my implementation of it?
>    2. At it's core the patch uses the OpenLdapSchemaParser to read the .schema files,
which is currently only available in the Maven2 plugin artifact     
> <groupId>org.apache.directory.server</groupId>
> <artifactId>apacheds-core-plugin</artifactId>
>    
>     which is a bit clunky as it means people need to include this jar in their classpath
(or in the UberJar). Perhaps this parsing component should be separated from the rest of the
maven plugin to tidy this up (I don't know maven well enough to do this myself).
>    
>    3. If the feature and implementation are ok, what further steps should I take re preparing
the patch for inclusion?
> Thanks (by the way I was previously known as Norbert Reilly)

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