Re: Design question ...

hi,
see singleton in cluster, you can resolve your problem similar way
http://www.javaspecialists.co.za/archive/Issue052.html

martin

Rafal Kedziorski <rafcio@POLONIUM.DE>
Odeslal: An interest list for Sun Java Center J2EE Pattern Catalog <J2EEPATTERNS-INTEREST@JAVA.SUN.COM>
13.07.2003 13:09
Odpovězte prosím uživateli An interest list for Sun Java Center J2EE Pattern Catalog

Komu: J2EEPATTERNS-INTEREST@JAVA.SUN.COM
Kopie:
Předmět: Design question ...

hi,

I have a small design question for our problem which is working on a single
instance of an appicaltion server. we are working with JBoss 3.2.2.

Our application - multimedia content management system - is an modules
based application. You can store media files with partient mata data. You
can admin category trees and keywords. If some user want for example edit
categories or keywords, this module will be locked for this user for the
duration of the edit session. our lock is working on a singe instance
without problems. how we do this. we have this method:

public synchronized boolean lockKeywords(Long user_id, Integer mandant_id,
Long project_id)
throws CreateException, ProjectException {
...
}

for each module we writes a history (created, changed, removed, locked,
unlocked, ...) to the db. this table we use for locking. we are searching
for the last unlock. id we found one, than the module can be locked for the
given user.

but this wan't works in an cluster environment. are the a pattern, which
can we use to solve our problem? or should we user other implementation?

Best Regards,
Rafal

====================================================================
Community Web Site (Core J2EE Patterns Catalog - Online Version):
http://java.sun.com/blueprints/corej2eepatterns
Getting Started (Beta Version):
http://developer.java.sun.com/developer/technicalArticles/J2EE/patterns/
Get the book:
http://www.amazon.com/exec/obidos/ASIN/0130648841/corej2eepatte-20
List Archive:
http://archives.java.sun.com/archives/j2eepatterns-interest.html
Unsubscribing:
email "signoff J2EEPATTERNS-INTEREST" to listserv@java.sun.com

Re: Design question ...

Martin Zuzcak

2003-07-15