This repository contains a skeleton for an exercise included in the "Basic Erlang Part 2" course/presentation.
A solution proposal is also included.
Write a small Ping-Pong program that runs in 2 nodes. The program sends a message back and forth between the shell processes, which is printed to the shell. Make use of the following erlang functionality:
register
spawn
receive
!The program has to be kickstarted manually via manual interaction - this is okay.
Skeleton for the exercise can be found in pingpong.erl Be aware that the solution needs to be loaded and kickstarted manually.
- Start the server on two different nodes
- Send a ping manually in the same way the program would send it
- The other node should now automatically respond with a pong.
- The first node should now automatically respond with another ping.
There are no tests due to the multi-node nature of the exercise.
There's a single-node version of this program included in the file pingpong_local.erl. The main difference is that the two pingpong processes are on the same node. You can use it as reference.
If you want to, you can try to add the following challenge to the exercise:
While the ping-pong program is running, update the code without interrupting it so that the ping and pong messages are changed.
For example, instead of printing "Received ping", you can print "Received ping v2"
Remember to use fully qualified function calls to call new code.
There's a proposed solution in the file proposal.erl.
Credits for the initial versions of the presentation and the exercise with its solution goes to Gianfranco Alongi, https://github.com/Gianfrancoalongi