File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
http://aspose.com/file-tools
The moose likes Developer Certification (SCJD/OCMJD) and the fly likes NX: lock and unlock Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Murach's Java Servlets and JSP this week in the Servlets forum!
JavaRanch » Java Forums » Certification » Developer Certification (SCJD/OCMJD)
Bookmark "NX: lock and unlock" Watch "NX: lock and unlock" New topic
Author

NX: lock and unlock

jq zhu
Greenhorn

Joined: Aug 20, 2003
Posts: 12
my assignment is :
"public void lock(int record)
public void unlock(int record)
The unlock method simply removes the lock from the specified record. If an attempt is made to unlock a record that has not been locked by this connection, then no action is be taken."

so my question: how can iimplement the unlock without modified its definition?
i have two choice :
one is :
call lock(i)-modify(Data)-unlock(i) from client site, but client will call server three time in this way. i think how can modified a record does need known by client too.
second :
call lock(i)-modify(Data)-unlock(i) from server site,and server implements rmi interface, but i can't make sure it correspond with sun's requeriment.
which one should i chose , and is there any other good idea to implment it?
what your advice? thanks!


scjp1.2,scjd1.2,scwcd1.4,scea1.2 part1
jq zhu
Greenhorn

Joined: Aug 20, 2003
Posts: 12
lock requirement description:
The lock method should block until the requested lock can be applied. The integer argument indicates the record to be locked. If the method is called with an argument of -1, the entire database should be locked
jq zhu
Greenhorn

Joined: Aug 20, 2003
Posts: 12
why no person replay, it is very urgent!
jq zhu
Greenhorn

Joined: Aug 20, 2003
Posts: 12
closed, i have resolved it.
thanks.
Andrew Monkhouse
author and jackaroo
Marshal Commander

Joined: Mar 28, 2003
Posts: 11404
    
  81

Hi JQ,
Welcome to JavaRanch.
Sorry I didnt get to your post until now. I hope you will still stick around and give us more chances to help.
I am glad you solved your problem. Davidd was tackling the same problem in this thread - you may be interested in the solution we were discussing there.
Regards, Andrew


The Sun Certified Java Developer Exam with J2SE 5: paper version from Amazon, PDF from Apress, Online reference: Books 24x7 Personal blog
jq zhu
Greenhorn

Joined: Aug 20, 2003
Posts: 12
thank you very much! i have gone to the Topic: NX: About data consistent.
it is very good.
i will not level here.
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: NX: lock and unlock
 
Similar Threads
Locking/Unlocking, -- Am I Done Or I Don't Understand Requirements?
lock and unlock
pls give some comments on my lock/unlock
Does this guarantee a unique client?
lock and unlock