question about lockCookie

[Yanxin Zhao]

Hi:
I do not know how to deal with the lockCookie ?
I think it is useless in my code, but I have to use it.
So, I want to ask how to generate the lockCookie value, and how to use it.?
And I still have another problem. how to add some blank space at the end of a String ?
Thanks
[ July 28, 2004: Message edited by: Yanxin Zhao ]

[Anton Golovin]

Originally posted by Yanxin Zhao:
Hi:
I do not know how to deal with the lockCookie ?
I think it is useless in my code, but I have to use it.
So, I want to ask how to generate the lockCookie value, and how to use it.?
And I still have another problem. how to add some blank space at the end of a String ?
Thanks

[ July 28, 2004: Message edited by: Yanxin Zhao ]

I am going to have the DataImpl class generate a long and return it to the client. I still have to figure out how to do that.

[Robert Konigsberg]

Which assignment are you using? Boggit&Scrapper? Why do you think it's useless?

[Yanxin Zhao]

Hi: Robert
Thank for your answer. In fact, I just want to ask how or where should I generate the lockCookie ?
And another problem, How to add some blanks space at end of a String, you know there are some blank spaces in any colomn in the db file, so if I want to add a new record I have to add some blank spaces at the of each colomn.
Thanks for your answer, again.

[Yanxin Zhao]

Hi:Anton
First of all, thanks for your answer.you said you will have the Dbimpl class to generate a long value. so I want to ask you how did you generate the long value. I really do not know how to do it, please tell me.

[Anton Golovin]

I would just have it generate sequential values from 0. Client could call a method from the object, public long identifier(), and get a lockCookie back. It would later use it to communicate with the server. I would put this method into the interface Identifiable, for instance, that I would have the DBRemote interface extend. My DataImpl (remote-enabled) class would have the following:

 
public interface DBRemote extends DBClient, Remote, Identifiable {}
 
public class DataImpl extends UnicastRemoteObject implements DBRemote {
  private static int cookie = 0;
  public static int generateCookie() {
   return ++cookie;
 }  
 
  public long identifier() {
   return (long)DataImpl.generateCookie();
} 
 
...
 
} 

[ July 29, 2004: Message edited by: Anton Golovin ]