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Implementing TCL/CCI commands in JavaTCL

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I'm trying to implement CCI ( common command interface ) using collections as in Synposis TCL-EDA suite ( http://www.eda.org/edps/edp04/submissions/presentationDwight2.pdf) 

I'm not able to think of proper memory management while using CCI , 
let me give an example 

## sizeof_collection will return the collection size ( integer ) 
dc_shell> sizeof_collection [get_cells reset_port*] 
4 

## get_cells will return a pointer to a collection , actually it is an index of a collection list 
dc_shell> get_cells reset_port* 
0x10 

## below command will give error as CCI engine has free'd up memory ( no references pointing to collection ) 
dc_shell>sizeof_collection 0x10 
TCL ERROR 

## now set the collection to a variable , collection pointer increments by one . 
dc_shell> set a [get_cells reset_port*] 
0x11 

## Now the sizeof_collection returns correct value , i.e collection is still in memory 
dc_shell> sizeof_collection $a 
4 
dc_shell>puts $a 
0x11 

## Even in this case sizeof_collection returns the correct value , as it has reference ( pointed by variable "a" ) 
dc_shell > sizeof_collection 0x11 
4 

### Clear reference pointer 
dc_shell > set a "" 

## Now we will get error , as the reference from a has been removed !! 
dc_shell > sizeof_collection 0x11 
TCL ERROR 

Can you tell me know to keep track of TCL_Object and 
free resources when there are no references pointing to them . 

and I'm using TCL-Java where garbage collection is been done by Java.GC 
this is another headache ! 

Jacl Page : http://wiki.tcl.tk/1637

Regards 
Nataraja G 

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Implementing TCL/CCI commands in JavaTCL nataraja.3.833@gmail.com - 2014-11-29 23:54 -0800
  Re: Implementing TCL/CCI commands in JavaTCL Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-11-30 17:40 +0000
    Re: Implementing TCL/CCI commands in JavaTCL nataraja gadikota <nataraja.3.833@gmail.com> - 2014-11-30 21:44 -0800

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