Hi!
>JESS doesn't inherently possess transaction support.
I've implemented a package called Java Object Transaction Service (JOTS),
which is based on the CORBA Object Transaction Service. Currently, only
local transactions are supported, i.e., the transactional objects plus the
transaction coordinator all reside in the same Java process.
Jess integration is achieved via a Userpackage providing the following
functions:
1) (jots-current-begin) - begin a new transaction
2) (jots-current-commit) - commit current transaction
3) (jots-current-rollback) - rollback current transaction
4) (jots-current) - return current transaction context
Below is a sample showing how to use these functions. The (state-create)
function will eventually call the Java connector that creates a record in
the database for the given fact. The connectors (in this simple example
it's only one) are automatically registered with the transaction
coordinator.
(deffunction create-emp-in-new-dept (?empno ?ename ?deptno ?dname)
;; Begin a new transaction
(try
(jots-current-begin)
catch
(return FALSE))
;; Perform transactional operations
(try
(state-create (assert (scott-dept (deptno ?deptno) (dname ?dname))))
(state-create (assert (scott-emp
(empno ?empno) (ename ?ename)
(deptno ?deptno))))
;; Commit changes
(bind ?result (jots-current-commit))
catch
(bind ?result FALSE)
(jots-current-rollback))
(return ?result))
Greetings
Thomas
________________________________
Dipl.-Inform. Thomas Barnekow
Fraunhofer IAO, Competence Center Software Technology
mail: Nobelstra�e 12, D-70569 Stuttgart,
Germany
phone: +49 (0) 711 / 970 - 2346
fax: +49 (0) 711 / 970 - 2300
mobile: +49 (0) 172 / 7126018
email: [EMAIL PROTECTED]
web: http://www.swt.iao.fhg.de
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