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Naros |
sfisque: you here? |
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* SoniEx2 |
hugs sfisque and goes to bed |
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syncsys_ |
Naros, hi. |
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| 16:10 |
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Naros |
hi Quest |
| 16:15 |
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Naros |
I'm wondering if there is anyway that when using @EntityListeners that if multiple entities use the same Listener class, is there anyway for those to share the same class instance rather than creating a new instance for every @EntityListener annotation. |
| 16:48 |
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Naros |
or am I just worried about negligible overhead for several thousand entity classes? |
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| 17:07 |
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Quest |
Naros, you have a point |
| 17:08 |
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Naros |
It isn't every entity that uses these listeners but a great deal of them do and to have multiple instances being allocated for the same small piece of callback seems silly |
| 17:09 |
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Quest |
yes. agreed |
| 17:09 |
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Naros |
I thought about using Hibernate's Event system but the issue here is that the event system doesn't fire a pre-insert until post entity validation |
| 17:09 |
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Quest |
hm |
| 17:10 |
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Naros |
the crux of the issue is I have a number of entities with an embeddable property. |
| 17:10 |
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Naros |
What I didn't want to do is have to new this embeddable on new entities. |
| 17:11 |
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Naros |
But if I define the embeddable like this |
| 17:11 |
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Naros |
private AuditColumns auditColumns = new AuditColumns(); |
| 17:11 |
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Naros |
then during the load part of the entity, that's an unnecessary allocation. |
| 17:11 |
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Naros |
because it seems Hibernate allocates it's own AuditColumns(), populates it and then calls setAuditColumns() with it |
| 17:12 |
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Quest |
hm |
| 17:13 |
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Naros |
the only solution I have found has been either in the getAuditColumns(), add a check for null, and allocate if it is null or use JPA EventListeners on @PreInsert to manipulate the entity with a new AuditColumns(). |
| 17:13 |
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Quest |
you are right. but I cant say much as I dont have that much indepth research |
| 17:13 |
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Naros |
Unfortunately I can't refactor a lot of this because many entities have both an AuditColumns and DisabledColumns embeddable, some just a DisabledColumns and some with just Audits |
| 17:13 |
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Quest |
I would go for the later one, JPA evenlistteneres |
| 17:14 |
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Quest |
Naros, have you tried stackoverflow.com to ask? |
| 17:14 |
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Naros |
Not yet, I've been doing a fair amount of google search to see if I could find some best practices |
| 17:14 |
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Naros |
Our old implementation did a fair amount of private variable news |
| 17:15 |
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Quest |
when you finish. that. i suggest a stack post and a link to me too |
| 17:15 |
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Naros |
The issue I have with that is how much stress would that put on the GC when loading entities from the DB. |
| 17:16 |
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Naros |
since hibernate allocates it's own embeddable instance and calls set |
| 17:16 |
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Quest |
sfisque, and whartung are quite experienced here. may be they can comment too. |
| 17:16 |
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Naros |
aye, suspect with weekend - they are out and about. |
| 17:16 |
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Quest |
Naros, hm. a nice elaborated stack post would help a lot |
| 17:17 |
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Quest |
Naros, yes. weekend. and we are having some festival in our place too. so all are busy that i can invite either |
| 17:18 |
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Quest |
Naros, by the way. what do you use to communicate back and forth or with ajax. json or xml? |
| 17:19 |
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Naros |
when you say back and forth, do you mean dynamically on web pages? |
| 17:19 |
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Naros |
We typically use AJAX in combination with JSON. |
| 17:20 |
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Naros |
We only use XML when streaming data from Hibernate to Apache FOP |
| 17:21 |
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Naros |
to create PDF outputs |
| 17:21 |
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Quest |
Mmm to be little more exact. |
| 17:22 |
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Quest |
its a javaee question but its more of a strategy question rather a php/javaee |
| 17:22 |
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Quest |
I need to update the changed elements of a page every 10 seconds by ajax. I populate the elements in the first place on page load is by send an object to jsp. the iterating like wise. the object are e.g a board which have many boxes, and each box may have many tasts. tasks then have child nodes like text and title. Now 1. how do I interchange/pass the data from ajax call and page. 2. how to see/compare for changes and reflect only the changed nodes/ ob |
| 17:22 |
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Quest |
jects? |
| 17:23 |
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Naros |
well I'd suggest you also consider jquery in this mix. |
| 17:23 |
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Quest |
but I think its not a question of updating by ajax. or not. its about choosing a generic and easy thing. I know json occupies less data and xml is more taggy. but thats it? |
| 17:23 |
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Naros |
because then you can serialize a form's parameter list and pass it with your ajax callback. |
| 17:23 |
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Quest |
I would use jQuery obviously |
| 17:23 |
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Naros |
er that doh lol |
| 17:24 |
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Naros |
you tell ajax that the data you're getting back is json |
| 17:24 |
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Quest |
I always had confusion with what serialization is. its just used to transfer data |
| 17:24 |
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Naros |
then the success handler basically has a json object |
| 17:24 |
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Quest |
Naros, ya but why json? |
| 17:24 |
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Quest |
why not xml |
| 17:24 |
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Naros |
Well JSON objects can be iterated like java objects in Javascript. |
| 17:25 |
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Quest |
xml object can be too |
| 17:25 |
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Naros |
I suppose if you have a way to interpret XML in Javascript, you could do that too |
| 17:25 |
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Quest |
hm |
| 17:25 |
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Naros |
but JSON objects are generally lower bandwidth |
| 17:25 |
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Quest |
a bit yes |
| 17:26 |
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Quest |
but thats it i think. |
| 17:26 |
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Naros |
http://stackoverflow.com/questions/325085/when-to-prefer-json-over-xml |
| 17:27 |
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Naros |
seems json data can be parsed/validated in browsers easier and faster than XML |
| 17:27 |
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Quest |
hm |
| 17:27 |
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Naros |
but another post follows in that thread saying XML+XSL is more efficient for larger data sets |
| 17:32 |
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pdurbin |
"FtanML is a notation for data and documents designed to combine the simplicity of JSON with the expressive power of XML" -- http://dev.saxonica.com/blog/mike/2012/08/ via http://programming.oreilly.com/2013/08/can-we-do-better-than-xml-and-json.html and https://plus.google.com/107770072576338242009/posts/SW6riihYxTq |
| 17:35 |
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Quest_ |
hm. thanks |
| 17:37 |
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Quest |
hm. thanks |
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