message-bus | Go simple async message bus | Pub Sub library

After reading about C4 model and listening Simon Brown's talk I still don't understand how to use it in practice.

AFAIK, the main contribution of C4 model is "agreement" on simple abstraction that brings diagrams and documentation closer to developers. In the same C4 is more about advice, and you have to figure out some stuff by yourself (which breaks an "agreement" with custom abstractions again).

What should I do in case C4 lacks details? Till which degree I should customize it?

For example:

1. How supporting diagrams like Infrastructure, Data Flow or Business process fit into C4?
   For example, are routers/firewalls/api-gateways/service-buses a C4's Containers at Infrastructure diagram? I couldn't find any example.
2. Is that a good idea to extend C4's levels?
   C4 model has only 4 level (isn't recursive). What if I need the 5th subsystem level.
3. Should "Database Container" at container diagram (level 2) contain information about about database name, schema name or database technology?
   From examples, doesn't contain, ro does contain.
4. Is that possible to find C4 examples besides trivial from the official doc?

Update: check out the example at the bottom

I need to message between classes. The publisher will loop indefinitely, call some method to get data, and then pass the result of that call into OnNext. There can be many subscribers, but there should only ever be one IObservable, and one long-running task. Here is an implementation.

I need to parse some YAML in C++ (sort of newish to YAML). I'm looking to use yaml-cpp. My objectives are:

• To create some generic/reusable utility functions to help parsing of this YAML.
• To be able to update a YAML::Node and/or add missing values (by specifying default values)

If I take some example YAML, it might appear as:

On Windows, angular 6: I tried use many port but no any port work. I always receive error message: Port xxx is already in use. Use '--port' to specify a different port.

I also researched and tried many ways: - turn of firewall - using netstat to view ports and no any process use them - change other version of angular-cli, typescript in package.json But no solution for this.

This is my package.json file:

I'm working on a small programm where i'm evaluating if reactive ui is the right framework for another project. So far so good... At the moment i'm a little bit lost in a DynamicData related function. I'm trying to execute a command in the MainViewWindow every time a combo box in a ReactiveUserControl is changed. All my Models are extending ReactiveObject and the Properties are set up with the RaiseAndSetIfChanged setter.

In my ReactiveUserControl ViewModel I invoke my Command SaveImage from the ReactiveUserControl ViewModel as it is described here: https://reactiveui.net/docs/handbook/message-bus/#ways-to-avoid-using-messagebus

Defining the ObservableCollection

I don't know much about ruby/rails. My app is currently producing some json to be consumed by message-bus:

I have a tool that analyze some ruby projects having Gemfile and Gemfile.lock files. This tool given in input the path where ruby project is, list all its dependencies.

My problem is that I only need to print production dependencies excluding development and test. Today I find out that my code does not exclude them and I do not know how to modify it for my purpose. How I can remove development and test dependencies from the list?

Here a simplified version of the ruby code I use to list dependencies: