具有共享资源的多线程服务器

Question

I'm trying to make a simple game in Java. I want to code a server that accepts multiple players. Here is the meta of the game:

A player connects to the server to play a game, and indicate a number. Each player plays one game only. The game only starts or resolve if 4 players get connected. If the sum of all players number is greater than 21 all lose, else, all win. After the game resolves each player must be warned if it won or lost.

The algorithms for the win/lose check, or accept multiple clients I get it. My doubt is what should be a thread (or a runnable object) and/or what is a shared resource. Just a few guide lines and so I can implement this.

Answer 1

What i have understood from your statement is that you need exact 4 players to decide game's outcome. each player passes a number while connecting to server and he/she is not allowed to enter or pass anything more.

so the shared resources are TOTAL SUM and NUMBER OF CONNECTION and thread is connection to server . So whenever a player requests to connect you, start a new thread and this thread increment the shared TOTAL SUM and NUMBER OF CONNECTION and after incrementing also check the value of total sum and no. of connection.