How can i design my application to prevent multiple login

i need to develop a new application which want to prevent multiple user login. How can i do that? if i put all userid in a stack/arraylist and set it global, then set a filter to check the stack each time, is it ok, or have another better solution to do that. Thanks.

Your client application needs to contain a unique Session identifier and the server application needs to keep a mapping of these Session identifiers against the User that is logged in.
Then if another client app trys to log in with the same User ID and it is not the same as the current logged in Session identifier for that User, you can deny them access.
Make sure the client app has a mechanism for logging out the current User/Session identifier, by way of a button or event.
Events may go as follows:
1. User A logs in
2. Server app creates Session ID 1.
3. Client app is assigned Session ID 1.
4. Server app maps User A to Session ID 1.
then later
5. Different user tries to log in as User A.
6. Server app checks for Session ID.
7. No Session ID exists.
8. Not the same user - go away (or other instruction)
or
5. Original User A (from point 1) logs in again.
6. Server app checks for Session ID.
7. Client app sends Session ID 1.
8. Server app checks mapping of Session ID 1 to User A.
9. Success, User A is the original user - please continue what you're doing.
How you implement the storing of the Session ID on the Client app is dependant on the type of app your building - Cookies for web apps or encrypted files for GUI apps. The same applies for storing the mapping of the User to the Session but a database is the easist route to follow.
Hope this helps.

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How to prevent multiple logins by using HttpBindingListener

Hi,
Can anyone tell me how do i actually use session to prevent multiple login from different machine? From my understanding, i need to use HttpBindingListener to valueBound and valueUnbound when user tries to login, but i encounter a problem is my session is always overwritten since i use setAttribute() method in servlet.
For instance i use username(aaa & bbb) to login in two different machine, my login is always overwritten if i use username bbb to login after username aaa. i know it is because setAttribute() method overwrite existing session data, so i would like to know what other method should i use to achieve what i want, tks.

Hi,
This is the logic for session :
Connect to db for verification, once verified, system return a UserBean and this UserBean will be set in ClientSecurityEngine
When this particular user has been successfully verified, a new session will be created
if(success)
 session = request.getSession();
 User user;
 synchronized(session)
 user = (User) session.getAttribute("user");
 if(user == null)
 user = new User(ClientSecurityEngine.getInstance().getUserBean().getUsername());
 session.setAttribute("user", user);
/* User class */
public class User implements HttpSessionBindingListener {
 private static Map<String, HttpSession> logins = Collections.synchronizedMap(new HashMap<String, HttpSession>());
 private String username;
 public User(String username) {
 this.username = username;
 public String getUsername() {
 return username;
 @Override
 public void valueBound(HttpSessionBindingEvent event) {
 if (logins.containsKey(getUsername())) {
 HttpSession session = logins.remove(getUsername());
 if (session != null) {
 session.invalidate();
 logins.put(getUsername(), event.getSession());
 } else {
 logins.put(getUsername(), event.getSession());
 @Override
 public void valueUnbound(HttpSessionBindingEvent event) {
 logins.remove(getUsername());
}Edited by: EJP on 21/07/2011 14:22: added {noformat}{noformat} tags so we can actually read your code. Please use them.

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Hello everyone. I have my itunes account for some years, and i've purchased far too many apps and music. Now the company i work for, has to change my account in the iphone, in order to use the corporate mails and calendar. How can i keep my applications?

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How can I allow the application to line through a field that has been locked after being digitally signed? We have multiple sections on a form with some fields being proposed information and other in another section having the approved information. once

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We have multiple sections on a form with some fields being proposed information and other in another section having the approved information. once the approved information is entered we line through the proposed field so the data entry clerk won't pick up the wrong information. However we are receiving an error when attempting to enter data in the field which we have this edit. Error property: line through cannot be set because doing so would violate the document permission setting. any idea how we can get around this issue?

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In the dialog I have combo box in which I can select desire language for application. When I select value I save this value in the config file. But language change ONLY when I exit and again enter to the application. How can change language of application dynamic (without exit from application) ?

alexpass wrote:
In the dialog I have combo box in which I can select desire language for application. When I select value I save this value in the config file. But language change ONLY when I exit and again enter to the application. How can change language of application dynamic (without exit from application) ?I guess your application sets the locale at "startup", based on the contents of the config file, using a call to java.util .Locale.setDefault(Locale). Did you try to call this method in response to the selection in the combobox?
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Solved!
Go to Solution.

By the time you spend for the nice diadram you might have done the vi
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Spoiler (Highlight to read)
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

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I entered a script that autoclicks every 0.1 seconds and I didn't turn off the mouse thing so it just keeps entering 5s. I can't do anything except move my cursor(can't click or type). How can I close this application?

> I have an interface (main vi) wich call another interface (pop
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>
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How can i design my application to prevent multiple login

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