Hi Faisal,
As you can see, the channels in this example are implemented as an in-memory storage singleton class. This means the data will not be persistent if an exception stops the application. While there are various retry mechanisms, their practicality can vary. For instance, if a message in the queue fails to process due to an issue that needs fixing, simply retrying might not resolve the problem, as the same message would likely fail again.
However, if you still want to implement a retry mechanism, you could add a try-catch block and re-queue the message in the catch block. For example, in this line of code: https://github.com/behdad088/Channel-In-Dotnet/blob/main/src/ChannelApi/BackgroundServices/ReportConsumer.cs#L11, you can add a try-catch block and write the failed message back to the channel. Additionally, using logging can provide more information about why and where the failures occur.
I hope this answers your questions. Feel free to continue the discussion if you have more questions. I'll do my best to help as much as I can.