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[EMF/GMF] - Performance issue on load and save model. [message #1063868]

Fri, 14 June 2013 11:21

Eclipse User

Hello,
I use the : org.eclipse.emf.ecore.uri_mapping to map my logical URI (business URI) to physical URI (HTTP url).
It's a RESTFULL API to save, load and delete EMF/GMF resource. XMI model (EMF and diagram resources) are saved server-side into a database.
Everything works. All EMF mechanisms are completely transparent.

But the number of requests sent to the server is very too important.
With the resolveProxy option à false i have:

A) Loading a GMF diagram => 5 queries
1 query for load the GMF diagram
2 query for load the corresponding EMF model
2 query for load the container of the EMF model

B) Saving a GMF diagram => 9 queries
2 update for saving GMF model and diagram : OK
7 query for reload : GMF resource / EMF model and his container.

As each GMF diagram own it's resourceSet, every openDiagram action do a lot of HTTP and SQL queries.

Then i search a solution to cache model at the client side and then limit query between client and server.

Thanks for help.

Re: [EMF/GMF] - Performance issue on load and save model. [message #1063871 is a reply to message #1063868]

Fri, 14 June 2013 11:39

Eclipse User

Philippe,

Comments below.

On 14/06/2013 5:21 PM, Philippe EUGENE wrote:
> Hello,
> I use the : org.eclipse.emf.ecore.uri_mapping to map my logical URI
> (business URI) to physical URI (HTTP url).
> It's a RESTFULL API to save, load and delete EMF/GMF resource. XMI
> model (EMF and diagram resources) are saved server-side into a database.
> Everything works. All EMF mechanisms are completely transparent.
>
> But the number of requests sent to the server is very too important.
> With the resolveProxy option à false i have:
> A) Loading a GMF diagram => 5 queries
> 1 query for load the GMF diagram
> 2 query for load the corresponding EMF model
I wonder why two?
> 2 query for load the container of the EMF model
Perhaps there's a read-only test?
>
> B) Saving a GMF diagram => 9 queries
> 2 update for saving GMF model and diagram : OK
> 7 query for reload : GMF resource / EMF model and his container.
What's being queries?
>
> As each GMF diagram own it's resourceSet, every openDiagram action do
> a lot of HTTP and SQL queries.
>
> Then i search a solution to cache model at the client side and then
> limit query between client and server.
What would you cache? How could you be sure the cache is consistent
with what's one the server?
>
> Thanks for help.
>
>

Re: [EMF/GMF] - Performance issue on load and save model. [message #1064617 is a reply to message #1063871]

Thu, 20 June 2013 05:12

Eclipse User

Ed,
My first improvement was only on the use of options for loading and saving resources EMF.
No need to customize a URIHandler, just (re)-read chapter 15 of the EMF modeling book. Options in PerformanceXMIResourceFactoryImpl (p. 495) works very well.

Now I'll work on the part GMF editor to see if I can reduce the number of queries (especially saving a diagram).
Thanks for your time.
--
Philippe

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