[ApacheDS] Need idea on allowing/prohibiting modification of request parameters and operation results by Triggers

[Ersin Er <er...@gmail.com>]

Hi all,

I'm currently working LDAP Triggers as a somewhat cool addition to 
ApacheDS. The progress can be partially followed from:

http://docs.safehaus.org/display/APACHEDS/Triggers

We allow interception of each LDAP operation with BEFORE, AFTER and 
INSTEADOF triggers. There are lots of details to share but currently I 
have an important question where I need some suggestions. (I'll be 
sharing much more in a month.)

We allow operation specific parameters to be injected to Stored 
Procedures fired by Triggers. The question is: Shall we allow 
modification of these parameters by stored procedures? Shall we pass 
references of real (meaning the object itself which takes place in the 
operation) mutable objects and allow modification of those values? For 
example, if someone performs a add operation, shall we allow the 
Trigger/SP writer to modify the attributes of the entry to be added? Or 
from the other perspective, shall we allow modification of search 
results for instance?

Another problem is, if we allow this modification, what shall we do with 
immutable types? For example, a compare operation results a boolean (I 
mean the Java type) and it cannot be altered within a method it's passed.

BTW, we'll have some working Triggers/SPs in one month as we plan and 
wish. Then we may further investigate what's missing and what can be 
improved all together.

Thanks.

-- 
Ersin

Re: [ApacheDS] Need idea on allowing/prohibiting modification of request parameters and operation results by Triggers

[Trustin Lee <tr...@gmail.com>]

This is what I really disliked about LdapName and Attributes.  There had to
be both an immutable version and a mutable version of them.  For now we
could use clone() heavily so any changes on the returned result set or added
entry won't affect the stored entries at all.

On 6/6/06, Ersin Er <er...@gmail.com> wrote:
>
> Hi all,
>
> I'm currently working LDAP Triggers as a somewhat cool addition to
> ApacheDS. The progress can be partially followed from:
>
> http://docs.safehaus.org/display/APACHEDS/Triggers
>
> We allow interception of each LDAP operation with BEFORE, AFTER and
> INSTEADOF triggers. There are lots of details to share but currently I
> have an important question where I need some suggestions. (I'll be
> sharing much more in a month.)
>
> We allow operation specific parameters to be injected to Stored
> Procedures fired by Triggers. The question is: Shall we allow
> modification of these parameters by stored procedures? Shall we pass
> references of real (meaning the object itself which takes place in the
> operation) mutable objects and allow modification of those values? For
> example, if someone performs a add operation, shall we allow the
> Trigger/SP writer to modify the attributes of the entry to be added? Or
> from the other perspective, shall we allow modification of search
> results for instance?
>
> Another problem is, if we allow this modification, what shall we do with
> immutable types? For example, a compare operation results a boolean (I
> mean the Java type) and it cannot be altered within a method it's passed.
>
> BTW, we'll have some working Triggers/SPs in one month as we plan and
> wish. Then we may further investigate what's missing and what can be
> improved all together.
>
> Thanks.
>
> --
> Ersin
>



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