Re: System contracts

From:

Lew <lew@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 24 Jan 2011 10:29:35 -0800 (PST)

Message-ID:

<3766a0cf-bb17-4343-9ff8-680f632f6ca3@e9g2000prn.googlegroups.com>

On Jan 24, 4:13 am, gk <src...@gmail.com> wrote:

On Jan 22, 5:59 pm, Arved Sandstrom <asandstrom3min...@eastlink.ca>
wrote:

On 11-01-22 12:40 AM, gk wrote:

On Jan 21, 7:03 pm, Arne Vajh j<a...@vajhoej.dk> wrote:

On 21-01-2011 04:06, gk wrote:

On Jan 21, 6:29 am, Arne Vajh j<a...@vajhoej.dk> wrote:

On 20-01-2011 06:24, gk wrote:

On Jan 20, 3:35 pm, Arved Sandstrom<asandstrom3min...@eastlink.ca=

wrote:

On 11-01-20 12:29 AM, gk wrote:> JCA has a benefit ov=

er custom solution because System contracts

defined between application server and EIS resource adapter pro=

vides

connection pooling.

Could you please explain what kind of system contract we can th=

ink of

here ? Is it like what XML can be transferred OR what =

sort of

contracts we are after ? I would like to know more information =

at this

part.

The book or article that you pulled the first paragraph from sho=

uld have

listed the JCA contracts, seeing as how it mentioned them; if no=

t, toss

the thing in the trash.

JCA system contracts defined in version 1.0 of the JCA spec pert=

ain to

connection management, transaction management, and security mana=

gement.

"Contract" in this sense simply means a related set of requireme=

nts

between J2EE app server and EIS resource adapter.

Could you please provide one real example here. Is it like 30
concurrent connections , 10 minutes timeout etc ? Do you call =

these a

part of "System Contract" ? What sort of requirements generall=

y takes

place ? I'm not familiar. I'm sure these are not business
requirements ..right ?

I have found System Contract information. I have found this
http://java.sun.com/j2ee/images/Connector.jpg

Could you please be specific at this part.

Those contracts are not specific.

There are some interfaces that must be implemented by
some classes and some expectations about who do what
when.

Not clear . Couple of doubts here.

(i)Are there any popular JCA products who implements by some classe=

s ?

(ii)Does this kind of JCA product connects and bridges between
Application server and EIS ?

All outbound JCA connectors bridges between app server and EIS -
that is what it is intended for.
I think most JCA connectors are internal due to its
nature.

But standard products do exist.

Google found:

http://www.iwaysoftware.com/products/adapters/jca.htmlhttp://sourcefo=

....

Arne

Can not we use JCA Adapters for STANDALONE java applications to bridg=

to EIS ?

Does java applications needs to be deployable in J2EE App server in
order to use JCA Adapters ?

Section 3.4 in both the JCA 1.5 and JCA 1.6 specifications says:

"The connector architecture supports access to EISs from non-managed
application clients; for example, Java applications and applets."

So yes, you can use a resource adapter from a J2SE application.

The advantages of using JCA in a _managed_ environment are large, so JC=

1.6 has specification support for standalone containers. JBoss for one
has an implementation. A standalone JCA container isn't the same thing
as what you asked, but it may very well be what you want.

With either completely "standalone" J2SE access to EIS resource adapter=

(non-managed environment) or using a standalone JCA container (managed
environment, just not a Java EE full profile) the answer to your second
question is No; no, you don't need to use a app server to use JCA adapt=

ers.

AHS

Thanks . That was a lot of information.

By the way , what is a standalone JCA container (managed environment)
you mentioned ? what it contains ?

http://lmgtfy.com/?q=Java+standalone+JCA+container

which, among other fine links, leads one to
http://www.jboss.org/ironjacamar/docs.html

as one example.

--
Lew
Ceci n'est pas un post.