Dynamically adaptive environment for computer programs

• US 5,179,703 A
• Filed: 04/23/1990
• Issued: 01/12/1993
• Est. Priority Date: 11/17/1987
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Evans, Wayne O.
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): Treat, William M.
• Application Number:
  US07/515,772
• Time in Patent Office: 995 Days
• Field of Search: 364/200, 364/900, 395/700, 395/375, 395/500
• US Class Current: 717/122
• CPC Class Codes: G06F 9/45512 Command shells

Abstract

Multiple versions of a given system command are run on a single operating system by using one command processing program per command irrespective of its version. Each version of the command has a command definition which has the same format for all counterparts of the command. A command analyzer program transforms the parameters of a command character string into the correct data form for its command processing program based on the command definition for that version of the command. Multiple sets of command definitions are place in separate storage directories called libraries. The libraries are searched based on a version identifier to find the command definition for a command. The version identifier may be specified as a program attribute, entered interactively or entered by the system. Multiple programs written with different versions of commands may be run in conjunction with each other and the system will dynamically adapt to the version of each program as it is running. Also more than one command definition library may be searched to process a command. Therefore, commands written in various versions may be embedded in the same program and the system will dynamically adapt to multiple versions of commands in a program.

Claims

1. A dynamically adaptive computer system for executing one or more programs whose commands operate with different versions of the system commands, said system comprising:

means for storing at least two versions of system command definitions;

means responsive to system commands for indicating the version of system commands required by said programs;

means for retrieving command definitions from said means for storing, the version of command definition which is retrieved being dependent on said means for indicating the version of system commands;

analyzing means, responsive to system commands from the program being executed and responsive to retrieved command definitions, for transforming the system commands to a universal format; and

command processing means responsive to said analyzing means for processing the transformed commands so that all versions of the commands are executed by the command processing means.

2. The dynamically adaptive computer system of claim 1 wherein system commands contain one or more parameters, each parameter comprising:

a keyword which specifies a particular action; and

at least one value associated with the keyword for defining options associated with the keyword.

3. The dynamically adaptive computer system of claim 2 wherein the number of parameters in a system command is variable between different versions of the system command and said analyzing means comprises:

means for validating each system command against the parameters of its retrieved command definition; and

means for adding default or constant parameters in the system command in accordance with its command definition when the system command has fewer parameters than the universal format of the command whereby the system command is transformed into the universal format.

4. The dynamically adaptive computer system of claim 3 wherein said means for storing the versions of command definitions passes the parameters of the definitions in a predefined sequence to said analyzing means.

5. The dynamically adaptive computer system of claim 1 wherein the versions of the command definitions are stored in a universal format including command parameters which identify desired results of processing the command, and said analyzing means comprising:

means for parsing the command into parameters in accordance with syntax rules for the version indicated for the command;

means for validating the parameters in the command against the command definition for the indicated version of the command;

means responsive to said validating means for adding a constant parameter from the command definition into the parsed command when the parsed command is missing a parameter;

means for transforming command parameters into the universal format.

6. The dynamically adaptive computer system of claim 5 wherein the name of the program in the command processing means is the same for more than one version of a command.

7. The dynamically adaptive computer system of claim 1 wherein said one or more programs being executed are application programs and each such program specifies its version of commands.