Re: Cocoa EOF
Re: Cocoa EOF
- Subject: Re: Cocoa EOF
- From: Yves Custeau <email@hidden>
- Date: Fri, 02 Jul 2004 09:58:46 -0400
Hello John
Cocoa-Eof is 2-tier by default, unless you make some use of the WO server in
between (through web services maybe). The Java-Client is 3-tier, there is
some processing done at the Wo server level, you can define objects to
either run on the client or server.
I'm currently developing a Cocoa-Java application (2 tier) despite Apple
lack of support for the technology. The development cycle is OK, but the
application itself is rather slow. I think that Java (and the Java JVM) is
partly responsible.
When I start the application memory usage is already around 30 Megs. When I
go through different screen memory usage rises to 120Megs and some screens
are very slow (fetch is rather slow on 10000+ records table at least on a
desktop). I guess that too much stuff gets loaded into objects and NSArrays
of Objects.
Also there is too much processing done on the client. Our Xserve run
Openbase is almost idle when we test the application. I think it only
fetches the entire record set and pass it through to the client.
We cannot afford performance issues. So I took this week to investigate
alternatives.
So far I've tried the following setup:
Cocoa
Objective-C
Openbase Espresso API
Ok, this locks me in to Openbase. But we can live with that.
I redeveloped the login screens, main menu and one screen that caused me
problems with EOF.
Performance is astounding.
The applications load up at 9Meg and it does not break 20Meg despite
intensive usage of the complex screen. Load time is immediate. Switching
between NSTabItems (each fetch a subset of the data) does not cause any
delays.
We also found out that with the OB API some of the processing is done by the
server. We are pretty sure that WHERE and SORT BY clauses are handled on the
server and only the result set is passed back to the application.
I wanted to share my experience with you.
Using Cocoa-EOF is very tempting but the lack of support, lack of
documentation (aside from Javadocs API docs) and questionable performance on
the desktop might steer you to consider other alternatives for desktop-DB
apps.
> From: John Spicer <email@hidden>
> Date: Fri, 02 Jul 2004 07:57:51 -0500
> To: WOdev List List <email@hidden>
> Subject: Cocoa EOF
>
> We were warned away from this (by Apple) because they said it was going
> away. As a result, we didn't spend much time looking at it.
>
> Is it a two tier or three tier? If it's three tier I have to admit I'm
> tempted again....web services is poorly documented!
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| References: | |
| | >Cocoa EOF (From: John Spicer <email@hidden>) |