docker compose?

Unless you need inprocess communication (you don't for NodeJS native API) you can just refer from one container to another.

If records are never deleted and you're okay with a few misses, use ExtentSizeFast, if you need the fastest precise runtime implementation use ExtentSize, in you need better compile speed and don't care about runtime speed use GetExtentSize.

/// w ##class(Utils.Persistent).GetGlobal("Utils.Persistent")
ClassMethod GetDataGlobal(Class As %Dictionary.CacheClassname) As %String
{
    Quit:'$$$comClassDefined(Class) ""
    Set Strategy = $$$comClassKeyGet(Class, $$$cCLASSstoragestrategy)
    Quit $$$defMemberKeyGet(Class, $$$cCLASSstorage, Strategy, $$$cSDEFdatalocation)
}

/// w ##class(Utils.Persistent).ExtentSizeFast("Utils.Persistent")
ClassMethod ExtentSizeFast(Class As %Dictionary.CacheClassname) As %String [ CodeMode = expression ]
{
$Get(@..GetDataGlobal(Class), 0)
}


/// w ##class(Utils.Persistent).GetExtentSize("Utils.Persistent")
ClassMethod GetExtentSize(Class As %String) As %Integer
{
    Set Global = ..GetDataGlobal(Class)
    Quit:Global="" 0
   
    Set Id = $Order(@Global@(""))
    Set Count = 0
    While Id '= "" {
        Set Id = $Order(@Global@(Id))
        Set Count = Count + 1
    }
    Quit Count
}

ClassMethod ExtentSize() As %Integer [ CodeMode = objectgenerator ]
{
    set Strategy = $$$comClassKeyGet(%classname, $$$cCLASSstoragestrategy)
    set Global = $$$defMemberKeyGet(%classname, $$$cCLASSstorage, Strategy, $$$cSDEFdatalocation)
    Do %code.WriteLine(" Set Id = $Order(" _ Global _ "(""""))")
    Do %code.WriteLine(" Set Count = 0")
    Do %code.WriteLine(" While Id '= """" {")
    Do %code.WriteLine("     Set Id = $Order(" _ Global _ "(Id))")
    Do %code.WriteLine("     Set Count = Count + 1")
    Do %code.WriteLine(" }")
    Do %code.WriteLine(" Quit Count")
    Quit $$$OK
}

set user = $username
set role = "MyOperation"
set sc = ##class(EnsLib.Workflow.UserDefinition).CreateUser(user)
set sc = ##class(EnsLib.Workflow.RoleDefinition).CreateRole(role)
set sc = ##class(EnsLib.Workflow.RoleDefinition).AddUserToRole(role, user)

Export role/user globals as xml.

$STORAGE is a special variable which contains the number of bytes available for a current process. After it hits zero you get STORE error. You can profile your code to see which part leaks memory. Small example:

write $STORAGE
>268326112
set i=1
write $STORAGE
>268326104
kill i
write $STORAGE
>268326112

Check that:

• $storage before and after EvaluateClone call is the same
• $storage on each loop cycle is the same

Another approach is throwing/catching and logging an exception and checking what's available in each frame.

do clone.Children.RemoveAt(key) // update clone

RemoveAt returns oref, maybe you need to kill it.

I'm wondering if IS has a java-like garbage collector (as in "the object is automatically destroyed"), and if so, is this keeping up with the clone construction and killing, over a 200k+ loop? Is it an immediate thing, or is there a garbage collector crawling around looking for un-referenced objects?

InterSystems products have automatic garbage collector. I'm not sure on the specifics. Calling @Dan Pasco.

You can use Java Gateway and this project.

On a first overview this looks like a container specification with standard crypto algorithms. So you can definitely implement it in InterSystems IRIS. I have done Xades implementation for InterSystems IRIS and it's doable (500 sloc total).