How to Limit Number of Users Logging into the application?

Question

I have made an application in Java(Struts Framework).

Is there a direct way or web.xml mapping or something else from where i can restrict the number of users logged in my application.

At present, I want only 2 users to login in my web application. Also, i can change the number any time. so want to make it a dynamic application.

P.S. : Don't want to use the traditional servlet concept of static variable and all as its creating problem in my application.

Answer 1

So our goal is to store the current number of logged in user, be able to read it, and be able to modify it by some means. We have a number of alternatives to static variable:

• Store the number in an ordinary file in file system
• Store the number in a database engine data table
• Run an external memory cache