Nats/Jetstream: naming conventions for commands' subjects

I have been working with Nats/Jetstream for a bit now and within a CQRS/Event sourcing project. Recently, it occurred to me that I have not been following any naming conventions for subjects' names that are used for commands (events are pretty much covered). What have been doing so far is, as follows:

myProjectName.internal.pricing

Meaning the myProjectName as my project name, internal as it is internal to a specific service in my project and then ultimately the action performed by that command (e.g. some pricing logic). Are there any widely used naming conventions I can use? I would appreciate if you can share any view or resource I can use to have a better naming across my project.

Thank you

Solution

There are good articles about it:

General recommendations:

separate.with.dots.lowercase - avoid capitalization.
Keep your subject short. It is recommended to keep the maximum number of tokens in your subjects to a reasonable value of 16 tokens max.
Create a structure for grouping. The separation by a dot (.) and the structure in the sense of the Reverse Domain Name Notation (reverse-DNS) has proven itself. Prefer Domain Service Names (see DDD).
Explicitly mark the data as "private" or "public" with a corresponding prefix - "private" is for internal subjects, "public" - for official.

public.sales.ecommerce.shoppingcarts
private.risk.portfolio.analysis.loans.csvimport

Suffixing by can be a good way to indicate in advance how to consume a topic for example .avro , .json, .text, .protobuf, .csv, .log.
You could prefix JetStream subject: js.in.orders.> (where .in/.out is the prefix for inbound or outbound messages).

What should be avoided?

Appending of a version number - the better way is to add the version number of the used schema as part of the header to the respective record. It is even better to use a schema registry in which all information about the schema, versioning, and compatibility is stored centrally.
Using application names as part of the topic name.
Team name/partition numbers or consumer/producer names.
Namespaces or company names - your colleagues usually know the name of the company where they work

public.com.xeotek.sales.ecommerce.shoppingcarts

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