MessageChannel - a pub-sub message-passing pattern

[pdeschain]

Description (*)

MessasgeChannel is a pub-sub mechanism that is heavily inspired by https://github.com/Cysharp/MessagePipe (but is much simpler in implementation an can do drastically less than the big library).

Also adding DIScope extensions - this messaging system is particularly useful with DI and the extension provided allows to easily bind all the necessary interfaces to the DI Scope for easy retrieval of either publisher or subscriber interfaces to the message channel.

When we use DI to pass the Pub or Sub references to classes - we facilitate less strong coupling in our code.

Usage would look like this:

struct Msg
{
//some message
}

//...

scope.BindMessageChannel<Msg>();

//and after the scope is resolved we can fetch IPublisher or ISubbscriber like this:

    public class PubUserExample
    {
        private IPublisher<Msg> _msgPublisher;
        
        [Inject]
        public PubUserExample(IPublisher<Msg> msgPublisher)
        {
            _msgPublisher = msgPublisher;
        }
    }

    public class SubUserExample : IDisposable
    {
        private IDisposable _subscription;
        
        [Inject]
        public SubUserExample(ISubscriber<Msg> msgSubscriber)
        {
            _subscription = msgSubscriber.Subscribe(Callback);
        }

        private void Callback(Msg msg)
        {
            
        }
        
        public void Dispose()
        {
            _subscription?.Dispose();
        }
    }
 

Related Pull Requests

Issue Number(s) (*)

Fixes issue(s):

Manual testing scenarios

1. ...
2. ...

Questions or comments

• Buffered pub-sub channel could be added - it would remember the last message passed and would replay it to any new subscriber.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[pdeschain]

closing this PR - the content in here was merged with Lobby PR