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From "Norval Hope (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DIRSERVER-760) reading .schema files at server start-up
Date Tue, 14 Nov 2006 23:59:39 GMT
    [ http://issues.apache.org/jira/browse/DIRSERVER-760?page=comments#action_12449867 ] 
            
Norval Hope commented on DIRSERVER-760:
---------------------------------------

This is some of the information I knew I didn't know :-)

I suspect Maven skills will need to come into play here, as currently I have "svn cp"d the
.schema files from apacheds/core/ to server-main/conf/ (with new names having appropriate
numeric prefixes) simply so the UberJarMain case could be demonstrated and the general approach
reviewed.

As outlined previously in this (admittedly long) issue thread, I have questions to which I
don't know the answers:
    1. Where should the numerically prefixed .schema files be copied to by Maven so that they
can be used in all release packages (uberjar/embedded/installers etc)? I know so little about
Maven that I wouldn't know how to arrange the copying of the files even if this destination
directory were decided.
    2. Where should the numerically prefixed .schema files  end up in the deployed images
for each of the release packages (uberjar/embedded/installers etc)? I noticed the InstallationLayout.getConfigurationDirectory()
method which looks promising; is this method used/usable for all release packages?

> 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: 1.5.1
>         Environment: N/A
>            Reporter: Norval Hope
>         Attachments: schema_branch.patch, schema_branch.patch, 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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