September 2001
Intermediate to advanced
592 pages
18h 22m
English
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Nontransactional Beans
Beans that reside outside a transaction scope normally provide some kind of stateless service that does not directly manipulate data in a data store. While these types of enterprise beans may be necessary as utilities during a transaction, they do not need to meet the stringent ACID requirements of a transaction.
Consider a nontransactional stateless session bean, the Quote EJB,
that provides live stock quotes. This EJB may respond to a request
from a transactional EJB involved in a stock purchase transaction.
The success or failure of the stock purchase, as a transaction, will
not impact the state or operations of the Quote EJB, so it does not
need to be part of the transaction. Beans that are involved in
transactions are subjected to the isolated ACID property, which means
that their services cannot be shared during the
life of the transaction. Making an enterprise bean transactional can
be an expensive runtime activity. Declaring an EJB to be
nontransactional (i.e.,
NotSupported)
leaves it out of the transaction scope, which may improve the
performance and availability of that service.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.