I have been looking into using abstract classes and methods. In other languages, if a superclass is defined as abstract, subclasses inheriting from the superclass will not compile until all abstract methods have been implemented in the subclass.
I have created the following classes to try this in Cache:
Class User.Music.AbstractClass [ Abstract ]
{

             Method testabs(inp As %String) [ Abstract ]{}

}

Class User.Music.AbstractTest Extends (User.Music.AbstractClass, %Persistent)

{    

           Method testabs(inp1 As %Integer) { w !!,"Input:",$g(inp,"undefined") }

}

When I compile User.Music.Ab

I have just started to experiment with Using IRIS in Docker.

My first objective was to be able to enable global persistence within a Docker container. Using the following command I have managed to achieve this:

docker run --detach --publish 52773:52773 --volume /data/dur:/dur --env ISC_DATA_DIRECTORY=/dur/iconfig --name iris21 store/intersystems/iris-community:2020.1.0.199.0

Within this container, I have created a simple global:

for i=1:1:10 set ^tmp(i)=""

I then stopped and removed the container. On reloading and restarting the container the global has persisted.

However, I have just discovered