[tcljava-user] Advice Porting Tcl C API Tcl_CreateObjCommand to TclJava tcl.lang.Interp#createCommand

[Brian B. (US) <Bri...@da...>]

We're porting a TCL-based C app to Java using TclJava (technically, jtcl).

We have a lot of TCL commands written in C which utilize the ClientData passed to Tcl_CreateObjCommand https://www.tcl.tk/man/tcl/TclLib/CrtObjCmd.htm.

TclJava lacks command ClientData support.  So I'm trying to come up with an alternative that works with TclJava tcl.lang.Interp#createCommand http://tcljava.sourceforge.net/docs/TclJavaLib/createCmd.htm.

A couple of Intra-Process-Communication approaches I've considering:
1. Use AssocData http://tcljava.sourceforge.net/docs/TclJavaLib/AssocData.htm.
2. Use a Java class static member (guarded for thread-safety) e.g. 

Package org.myorg.myprod;

public class GlobalData {
    public static Map<String,Object> clientData = new HashMap<>();
}

We have hundreds of TCL scripts which already use these commands, so altering the scripts to pass the "ClientData" as command arguments isn't really an option.

Has anyone already successfully solved this problem?  Are there examples of how to do this already?  Any advice?

Sincerely,
Brian Brooks
Sr Software Engineer
Duluth, GA 30096

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