Groupy - a group membership service

In this assignment you will implement a group membership service. If everything works ok, you will not only see colors but the same colors.

This is an assignment were you will implement a group membership service that provides atomic multicast. The aim is to have several application layer processes with a coordinated state i.e. they should all perform the same sequence of state changes. A node that wish to perform a state change must first multicast the change to the group so that all nodes can execute it. Since the multicast layer provides total order, all nodes will be synchronized. The problem in this assignment is that all nodes need to be synchronized even though nodes may come and go (crash). As you will see it is not as trivial as one might first think.

To pass, complete the assignment up to, and including, section 3, and be prepared to discuss the questions under section 4 at the reporting seminar. Write up your observations in a short report and be prepared to connect the nodes in a group at the reporting seminar. Section 4 also includes a task for extra bonus. 

This version uses the wxWidgets library.

• Groupy: a group membership service
• worker.erl
• gui.erl
• test.erl

At the corresponding reporting seminar you are required to present and demonstrate results of your homework, discuss your findings and problems (if any) you have faced, pros and cons of your solution, and your suggestions on how it can be improved. Specifically for this homework, be prepared to discuss the questions under section 4 at the reporting seminar.