[glue-wg] Foreign Key implementation on GLUE 2.0 LDAP implementation

[David Horat]

In the DN, the UniqueID is included. Example:

Having objects
Contact: EntityId=testContact,o=grid
Service: EntityId=testService,o=grid

To make that Contact point to that Service, it fill be:
ContactServiceFK: EntityId=testService,o=grid

I hope this helps.

Regards,
David

On Thu, Mar 26, 2009 at 10:17 AM, Laurence Field <Laurence.Field at cern.ch>wrote:

> Hi David,
>
> I would prefer to use the UniqueID rather than the DN. Can you provide a
> concrete example.
>
> Laurence
>
> David Horat wrote:
>
>> Hello all,
>>
>> After having a talk with Maarten, a few emails with Laurence, seen the
>> GLUE 1.3 LDAP implementation on lcg-bdii.cern.ch <http://lcg-bdii.cern.ch>
>> and though about it thoroughly, I have come to the next idea for
>> implementing Foreign Keys on LDAP:
>>
>>
>> Having an object ObjectA related to object ObjectB and being the
>> relationship ObjectA 0..* - 0..* ObjectB,
>> - ObjectA will contain the attribute ObjectAObjectBFK pointing to
>> ObjectB's DN
>> - ObjectB will contain the attribute ObjectBObjectAFK pointing to
>> ObjectA's DN
>> - In case the multiplicity was 1..X, with X between 1 and *,
>> ObjectYObjectZFK will be mandatory
>> - In case the multiplicity was 1 or 0..1, ObjectYObjectZFK will be
>> SINGLE-VALUE
>> - In case the relationship was Object A 0..* - 1 Object B, ObjectA will be
>> the only one holding the ForeignKey
>>
>> Since LDAP is not relational, there are a few pitfalls with LDAP:
>> - ObjectYObjectZFK is not checked to be the correct
>> - The duality ObjectAObjectBFK and ObjectBObjectAFK is not checked to have
>> the relation stated in both directions
>> - Moving between relations is done in the client and not the server, which
>> is not optimal
>>
>> These should be checked in an external client at appropriate invertals to
>> ensure the integrity of the LDAP server plus all the specifcations done in
>> GLUE 2.0 that can not be covered in LDAP (types, maximum range, etc.).
>>
>> I would like to have an approval of 1 or 2 people before starting with it.
>> So, do you like it this way? :)
>>
>> Regards,
>> David
>>
>> --
>> David Horat
>> Software Engineer specialized in Grid and Web technologies
>> IT Department – Grid Deployment Group
>> CERN – European Organization for Nuclear Research » Where the web was born
>> Phone +41 22 76 77996
>>
>> http://davidhorat.com/
>> http://cern.ch/horat
>> http://www.linkedin.com/in/davidhorat
>> ------------------------------------------------------------------------
>>
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>>
>>
>
>


-- 
David Horat
Software Engineer specialized in Grid and Web technologies
IT Department – Grid Deployment Group
CERN – European Organization for Nuclear Research » Where the web was born
Phone +41 22 76 77996

http://davidhorat.com/
http://cern.ch/horat
http://www.linkedin.com/in/davidhorat
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