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From Alex Karasulu <>
Subject Re: [ApacheDS] Enabling any partition implementation for system
Date Tue, 14 Apr 2009 14:53:13 GMT
Hi Andrea,

On Tue, Apr 14, 2009 at 8:02 AM, Andrea Gariboldi <> wrote:

> Hi alex,
>     back from my vacation :(,
> there are some comments inline.
> 2009/4/13, Alex Karasulu <>:
>> Hi all,
snip ...

> Change #2: Alter Initialization and Startup
>> ------------------------------------------------------------
>> I have modified (and renamed) the init method (now initialize()) on the
>> Partition interface to only require schema Registries. This was done to
>> allow Partitions to be initialized and made usable before the
>> DirectoryService has been started or even created. Before, the Partition
>> interface required a DirectoryService instance to initialize. There was no
>> easy way we could provide a hot Partition to the DirectoryService to
>> startup() itself if Partitions required a live DirectoryService.  Chicken
>> and egg should come to mind.
> Which registries instance are you passing into the partition
> initialization? I mean in the DefaultDirectoryService in the initialize()
> method the registries instance is changed after the schema is loaded:
>         //
> --------------------------------------------------------------------
>         // Initialize schema subsystem and reset registries
>         //
> --------------------------------------------------------------------
>         PartitionSchemaLoader schemaLoader = new PartitionSchemaLoader(
> schemaPartition, registries );
>         Registries globalRegistries = new DefaultRegistries( "global",
> schemaLoader, registries.getOidRegistry() );
>         schemaLoader.loadEnabled( globalRegistries );
>         registries = globalRegistries;  //
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
> Looks like the first registries instance is used only to check
> JdbmPartition indexed attributes are "known" in the schema, and than
> the schema is repopulated with some kind of filter (but i haven't read the
> code schemaLoader.loadEnabled() yet).

Basically you need some sort of minimal bootstrap schema in order to
normalize and search in the schema partition.  This is why an initial
Registries object is created and set immediately.  This is not don't for all
partitions but for the schema partition which uses a limited set of
attributes we control.

Once the real schema is loaded from the schema partition it is then used to
reset the registries on the schema partition.  So hence the registries
should be resettable.

> This is why for example i have to keep a directoryService instance in the
> OraclePartition (for ou=system) instead of having a "broken" registries
> instance (caching the registries in the initialization fase).

Just expose which we have to now ... a setter to reset the registries.

> So that when i getRegistries() on the directoryService i get the right
> instance.

You should be given the right instance after initialization if of course
your partition is used for the schema partition which we will now merge with

> I need registries in the partition only to normalize DN and attributes.
> Specifically the first thing that is asked is to normalize the suffixDN of
> the partition before the DefaultPartitionNexus is bootstrapped or the
> initialization will fail because it will not find the ou=system partition
> when searching for the uid=admin entry existence in the
> DefaultDirectoryService.createBootstrapEntries() method. So sounds like you
> have to initilize the schema before you have a valid registries instance...
> Sounds like this is the reason why we have a separate ou=schema partition,
> so that you can:


> create the schema partition -> initialize the registries from schema data
> -> use the registries to initialize other partitions (even ou=system).
> that make sense. So may be you have to keep separate the ou=schema and the
> ou=system. So that you have a smaller, simpler, and "normailzed" schema
> partition (using predefined meta-objectclasses and meta-attributeTypes, to
> describe objectclasses and attributeTypes), than a more complex system
> partition (with objectclasses and attributeTypes you loaded from the
> ou=schema partition data).

I was worrying about this considerring the schema extensions that will be
added to the server with CiDIT.  No longer will we have a controlled set of
schema elements used by entries under the configuration area.

Alex Karasulu
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