Design question ... 2003-07-14 - By Rafal Kedziorski
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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
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