Werner,
I have resolved my issues with lazy loading and upgrading from castor
.9.5.3 to 1.0m1.
Here are my findings.
1) You can't lazy load a list of dependent objects that are self
referential. I think the main issue is that castor uses a collection for
lazy-loading and the order can't be maintained. You really need to be able
to lazy-load a List. Although I did try using a mapping entry w/o
lazy-loading and I still ran into issues with updating and creating.
Resolution: you have to do all your loading, updating and deleting of
self-referential objects programmatically. You can't use the mapping file.
2) 1-to-many OQL is dramatically slower from from castor .9.5.3 to1.0m1.
Resolution: use jdbc sql to get all the ids, and then use castor to load
the objects independently.
3) Performance improvement loading,updating, and deleting objects in Castor
1.0m1. I did have a performance patch for .9.5.3 and it is not needed any
more. I think castor is now using a hash set, to keep track of identities
for a transaction.
4) I was intermittently getting duplicate identity errors but that seems to
be resolved.
I can do a bug report for 1 and 2. Let me know if you thing I need more
details.
Steve
----- Original Message -----
From: "Werner Guttmann" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, February 01, 2006 8:45 AM
Subject: RE: [castor-user] bug in lazy loading in 1.01m
Thanks, Steve.
Werner
-----Original Message-----
From: Stephen Ince [mailto:[EMAIL PROTECTED]
Sent: Mittwoch, 01. Februar 2006 14:39
To: [email protected]
Subject: Re: [castor-user] bug in lazy loading in 1.01m
Werner,
Thanx for the reply. No. I am going to try a few things.
I can't really use a sortedset, it doesn't allow for
duplicate entries. I will submit a bug report and a work around.
Steve
----- Original Message -----
From: "Werner Guttmann" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, January 31, 2006 3:49 PM
Subject: Re: [castor-user] bug in lazy loading in 1.01m
> Stephen,
>
> does the approach as suggested by Ralf address your issue ?
If not, can
> you please provide me with a fully working sample (ideally
following the
> bug submission guidelines available at
http://castor.codehaus.org) to
> replay your problem ?
>
> Thanks
> Werner Guttmann
>
> Ralf Joachim wrote:
>> Hi Stephen,
>>
>> Werner recently added collection="sortedset" (included
with 1.0M1). I
>> don't know how it behaves together with lazy loading but
it should be
>> the best option for you.
>>
>> You may want to have a look at release-notes for a short
description on
>> how to use it.
>>
>> Regards
>> Ralf
>> Castor JDO, committer
>>
>>
>> Stephen Ince schrieb:
>>
>>>I am getting duplicate entries when I am using lazy loading for a
>>>collection. It only happens when I add all the items to
the arraylist.
>>>What is the best way to model lazy loading when the
collection needs to
>>>be sorted?
>>>
>>>1--- N
>>>WebResource ------> FormData.
>>>
>>>Here is my implementation and mapping file.
>>>
>>>Class WebResource {
>>>:
>>> ArrayList formData = new ArrayList();
>>>
>>> public void setFormData(Collection formData) {
>>>
>>> this.formData.clear();
>>> if ( formData == null ) return;
>>>
>>> this.formData.addAll(formData);
>>>
>>> final Iterator iter = this.formData.iterator();
>>> while(iter.hasNext() ) {
>>> FormData f = (FormData) iter.next();
>>> f.setWebResource(this);
>>> }
>>> java.util.Collections.sort(this.formData);
>>> }
>>>
>>>
>>>
>>><class name="com.opendemand.jdo.WebResource" auto-complete="false"
>>>identity="webResourceId" key-generator="keygen"
>>>depends="com.opendemand.jdo.UserScenario">
>>>
>>><field name="formData" type="com.opendemand.jdo.FormData"
>>>
>>>required="false" direct="false" transient="false"
>>>collection="collection" lazy="true">
>>>
>>><sql many-key="web_resource_id" dirty="ignore" />
>>>
>>></field>
>>>
>>></class>
>>>
>>>Steve
>>>
>>>
>>>-------------------------------------------------
>>>If you wish to unsubscribe from this list, please send an
empty message
>>>to the following address:
>>>
>>>[EMAIL PROTECTED]
>>>-------------------------------------------------
>>
>>
>
> -------------------------------------------------
> If you wish to unsubscribe from this list, please
> send an empty message to the following address:
>
> [EMAIL PROTECTED]
> -------------------------------------------------
>
>
-------------------------------------------------
If you wish to unsubscribe from this list, please
send an empty message to the following address:
[EMAIL PROTECTED]
-------------------------------------------------
-------------------------------------------------
If you wish to unsubscribe from this list, please
send an empty message to the following address:
[EMAIL PROTECTED]
-------------------------------------------------
-------------------------------------------------
If you wish to unsubscribe from this list, please
send an empty message to the following address:
[EMAIL PROTECTED]
-------------------------------------------------
