Bugs item #665008, was opened at 2003-01-09 13:16
You can respond by visiting:
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Category: JBossCMP
Group: v3.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Markus Menner (morphace)
Assigned to: Nobody/Anonymous (nobody)
Summary: cache lists
Initial Comment:
Hi,
apparently cache-lists are not cleared correctly.
In my case I used JB3.2b3 but it is the same with 3.0.4.
My OS: WinXP, JDK 1.4.1_01
Yes, I have the CMP docs ... ;-)
Here my standardjbosscmp-jdbc.xml settings:
<read-ahead>
<strategy>on-find</strategy>
<page-size>500</page-size>
<eager-load-group>*</eager-load-group>
</read-ahead>
<list-cache-max>1000</list-cache-max>
I use commit-option B, instance per transaction
configuration for my CMP EJB's.
When you execute a finder (in my case a dynamic EJB-QL
finder) JBossCMP uses the read-ahead mechanism to
optimize loading. So far, so good.
For example three entites A, B and C.
A's relationship to B is (A) 1-n (B) with a foreign-key.
B's relationship to C is (B) n-1 (C) with a foreign-key.
The B entities are read-ahead correctly.
Now, the second case:
Three entites D, E and B.
D's relationship to E is (D) 1-n (E) with a foreign-key.
B's relationship to E is (E) n-1 (B) with a foreign-key.
When you execute a finder on D the cache-lists from the
first finder execution are used!
I noticed, that read-ahead is only working for 1-n
relationships :-(, not for n-1 (is it a bug ? Anyway,
I'll submit it). So normally you should get a query for
each B, which is the case if you do not execute the
first query, but if you do it, the B's are read-ahead
corresponding to the cache-lists of the first query!?
I hope that I explained everything enough.
TX
Markus
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