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JTree Update Design Question

Gregg Bolinger
GenRocket Founder
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Joined: Jul 11, 2001
Posts: 15299
    
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I have a JTree with 3 Nodes, Unaccepted, Accepted, and Closed. Under these nodes, the leaves are Trouble Tickets. The tree gets populated from a Database.
Several people will be modifying the database therefore the ticket status will change periodically. I am developing a polling method to update the JTree every 5 minutes.
My question is:
1. Should I just query the database and rebuild the tree everytime no matter what?
2. Should I do some checking so that the Tree is only updated if there are new Trouble Tickets.
And, if 2 is the way to go, should I rebuild the entire tree, or should I only add those Tickets to the appropriate node that are new?
The main thing I am looking for is performance.
Thanks for any suggestions.
[ November 21, 2002: Message edited by: Gregg Bolinger ]

GenRocket - Experts at Building Test Data
Chantal Ackermann
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Joined: Sep 28, 2000
Posts: 508
hi Gregg,
IMHO updating of the tree is done automatically whenever the treemodel fires a change event. so, the kind of the update depends on the event that is fired. very similar to the JTabel-TableModel communication. I would try to reduce the updating as much as possible for if the tree gets big, it might flicker when it is updated from scratch. most of the time, updating the whole thing is simply unnecessary, I suppose.
What I just thought of: you could create a table in the database itself that stores the information that and what data was changed, and when. thus, you won't have to check changes against your treemodel. each client would have to know when the last change happened, or what ID it had or whatever, to know which changes haven't been applied to it, yet. don't know, if that would work.
cheers
Chantal
 
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subject: JTree Update Design Question