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jclass lifecycle documentation

801075Sep 27 2010 — edited Sep 28 2010
I am looking for some documentation that describes JNI in terms of the jclass lifecycle.

What I mean by this, is that if a singleton DLL/DSO was loaded but allows the creation of distinct Class types (for different ClassLoader), I'd like to understand better the interaction of that with JNI. For example can I attach an opaque pointer to a jclass/Class from JNI so allow the JNI part of the system to independantly track information relating to that specific instance of a Class.

Also the interaction with the DefineClass (and implied UndefineClass) mechanisms within Java, for example could a class be redefined or undefined (if no longer used by any existing Object), does JavaVM manage class unload callbacks to JNI, allowing the opaque pointer I stored in the jclass to be natively deallocated.

Of course I understand that usage of jclass is shared by multiple users, so the native code using the opaque point would be thread-safe and deadlock free.



I have looked as best I can at the old sun hosted foum and also skimmed through the JNI documentation but have been unable to find any reference to how ClassLoader/Class creation/destruction affect JNI.

Comments

Stijn Gabriels
Hi Andy,

first of all, I don't really understand your SQL query. Nevertheless, I am wondering why you have used Row-Wise Initialization for this session variable, if you only want value "ALL" or the name of the region for the TEST session variable.

Regards,
Stijn
ADB
Stijn

in case a user has 'all' regions dedicated, I want to see all the organisations otherwise I only want to see the organisations linked to the specific region.

As I can't use a 'LIKE' (see error that you can only use =) into the session variable, I've worked something out returning the column name (user has 1 region) or 1 (user has all regions).

I hope it's more clear now.

KR,
A
Stijn Gabriels
So a user is joined to one or all regions and an organizations is joined to a region. Why don't you create one query, in which you join all the required tables?

Regards,
Stijn
ADB
[nQSError: 10058] A general error has occurred. [nQSError: 42040] The session variable, NQ_SESSION.ORGANISATIE, is defined as Row-Wise Initialization. It is restricted to usage with equality comparisons. (HY000)

I transformed my query like this, I don't have any clue why this isn't working...if I run this sql statement it works perfect but not in OBi

select 'ORGANISATIE', organisatie_nummer
from st_organisatie
,(select gebruiker,regio from st_gebruikers) b
where case when b.regio = -1 then 1 else regio_nummer end
like
case when b.regio = -1 then '%' else b.regio end
and upper(gebruiker) = upper(':USER')
ADB
Even after trying to create a view of the query and using this view within my session variable i have the same error.

My query is
select 'PARAM', organisatienummer
from vw_org
where upper(gebruiker) = upper(':USER')

It makes me desperate, so all help is welcome!

Kr,
A
Stijn Gabriels
I think your query should look like this:

SELECT 'ORGANISATIE', o.organisatie_nummer
FROM st_organisatie o, st_gebruikers g
WHERE o.regio_nummer = g.regio_nummer AND g.gebruiker = 'UPPER(VALUEOF(NQ_SESSION.USER))'

Regards, Stijn
ADB
:-) I know it should look like that, but that's the problem.

I don't have organisation for id = -1, that's why a make a translation of it towards a %

And even whenI put my values into a table I receive this error.....I'm lost...

Edited by: ADB on Dec 10, 2008 8:38 AM
Kishore Guggilla
Hi...

For your view approach post..
As per my knowledge... USER is the keyword for ORACLE, so it will n't accept it as bind variable.. as you are using...
So try give other name..

Thanks & Regards
Kishore Guggilla
ADB
Hi kishore,

txs but as I have the same prob when using a table, I guess there's something else;

Also when using valueof(nqsession.user) i have probs :-(
Kishore Guggilla
hi....

I am not sure this.. but try using content filter of particular logical table source...

Thanks & Regards
Kishore Guggilla
Stijn Gabriels
In my opinion this is not an OBIEE problem but a SQL / data problem.
I would advise you to fill your regio table with all correct combinations of regio and gebruiker and create the query as mentioned before.

Regards,
Stijn
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Locked on Oct 26 2010
Added on Sep 27 2010
#java-native-interface-jni
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