Thanks, Chip.
I'm inclined to believe everything you've said. We originally did
something very TOPLink-like, and had to adapt it ourselves to
"shoehorn" it into a JTA environment. The heavy use of runtime stuff
made me really skeptical of TOPLink, as did the runtime pseudo-SQL
query environment (based on query objects). I took what they did and
did a compile-time, auto-generated approach (using the generation gap
pattern), and it worked beautifully. As you say, took about a week to
write.
Thanks,
Ben Flaumenhaft.
At 3:47 PM -0600 12/20/00, Chip Wilson wrote:
>I've used it on three different projects. I don't have the ability to
>support all the following claims right now - so take them for what they are;
>unsupported opinions. TOPLink is bloated, overly-complex, and innapropriate
>for an EJB architecture. The transaction API and implementation have to be
>shoe-horned into a JTA environment. It doesn't support 2PC, or at least it
>didn't a year ago. Debugging problems is a nightmare. Developing and
>maintaining mappings takes longer than writing individual broker/mapper
>classes for each persistent object. The ramp-up time for developers is
>extremely long. TOPLink is really, really slow. The cache is useless in an
>EJB environment. TOPLink is really expensive.
>
>I have written, helped write, designed and used countless O/R frameworks in
>C++, Smalltalk and Java. I even helped develop a commercial competitor to
>TOPLink, but it is no longer supported.
>
>In an EJB environment, I favor a minimalistic O/R framework with
>broker/mapper classes that execute JDBC calls and map between the schema and
>the domain model. Entity beans access the persistence framework through a
>facade. I typically prefer to hard-code the mapping logic, as this is the
>easiest to develop, learn and maintain. If you must do some sort of
>meta-data-based mapper, keep it simple and allow the ability to do it
>manually in specific brokers. A simple framework like this can be designed,
>implemented and tested (minus all the individual broker classes) in 40
>man-hours.
>
>>From: "B. Flaumenhaft" <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED], [EMAIL PROTECTED]
>>Subject: Re: O/R Mapping Tools
>>Date: Wed, 20 Dec 2000 11:55:20 -0800
>>
>>
>>Can you give us some details? I'd be very interested to learn more. I
>>looked at TOPLink some time ago and was very impressed by its feature
>>set and customizability. It was simply too expensive, and I had some
>>doubts about performance and the runtime model.
>>
>>Why should we run away?
>>
>>Thanks,
>>Ben Flaumenhaft
>>
>>At 8:13 AM -0600 12/20/00, Chip Wilson wrote:
>>>Run away from TOPLink as fast as you can. Run far away.
>>>
>>>>From: Thomas Bökamp <[EMAIL PROTECTED]>
>>>>Reply-To: A mailing list for Enterprise JavaBeans development
>>>><[EMAIL PROTECTED]>
>>>>To: [EMAIL PROTECTED]
>>>>Subject: O/R Mapping Tools
>>>>Date: Tue, 19 Dec 2000 23:37:50 -0800
>>>>
>>>>Hi,
>>>>
>>>>Parts of my current work is to evaluate O/R Mapping Tools products. Is
>>>>there
>>>>such a thing a report to study different O/R Mapping Tools . Currently we
>>>>are looking at Cocobase and Toplink. Can somebody help with the following
>>>>questions:
>>>>
>>>>- Anybody know about Cccobase or Toplink the quality and Performance?
>>>>- Any other O/R Mappers worth evaluate? Especially we would like to know
>>>>if
>>>>there is a product that the C++-part of the project can use too.
>>>>
>>>>Thanks in advance
>>>>
>>>>Thomas.
>>>>
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>>>
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>>
>>
>
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