6.1.4.5 Command Service

Function: make-command-server rdb table-name

Returns a procedure of 2 arguments, a (symbol) command and a call-back procedure. When this returned procedure is called, it looks up command in table table-name and calls the call-back procedure with arguments:

command

The command

command-value

The result of evaluating the expression in the procedure field of table-name and calling it with rdb.

parameter-name

A list of the official name of each parameter. Corresponds to the name field of the command’s parameter-table.

positions

A list of the positive integer index of each parameter. Corresponds to the index field of the command’s parameter-table.

arities

A list of the arities of each parameter. Corresponds to the arity field of the command’s parameter-table. For a description of arity see table above.

types

A list of the type name of each parameter. Correspnds to the type-id field of the contents of the domain of the command’s parameter-table.

defaulters

A list of the defaulters for each parameter. Corresponds to the defaulters field of the command’s parameter-table.

domain-integrity-rules

A list of procedures (one for each parameter) which tests whether a value for a parameter is acceptable for that parameter. The procedure should be called with each datum in the list for nary arity parameters.

aliases

A list of lists of (alias parameter-name). There can be more than one alias per parameter-name.

For information about parameters, See Parameter lists.