内容

目次

1. Naming Conventions.- 1.1 Guidelines for the Selection of Identifiers.- Problem: Naming Entities in a Message-Switch Program.- 2. Types.- 2.1 Discrete Types.- Problem: Message Classification Types.- 2.2 Implementation of Set Types.- Problem: Sets of Communities in a Message-Switch Program.- 2.3 Constant Array Declarations.- Problem A: Message Transmission Identifier Strings.- Problem B: A Baud Rate Table for a Message-Switch Program.- 2.4 Record Types.- Problem: Storing Message History Information.- 2.5 Recursive Type Definitions.- Problem A: Linked Lists of Physical Transmission Lines.- Problem B: Defining Data File Elements as Access Types.- 3. Coding Paradigms.- 3.1 Use of Slices.- Problem A: Operations on Message Strings.- Problem B: Constituent Fields of Text Lines.- 3.2 Short Circuit Control Forms.- Problem A: Inappropriate Optimization in a Date Package.- Problem B: Inappropriate Optimization in Message Comparison.- Problem C: Avoiding Constraint—Error in Loops.- 3.3 Loop Statements.- Problem: Three Approaches to Searching an Array.- 3.4 Use of Block Statements for Local Renaming.- Problem: Determining Transmission Line Precedence.- 4. Exceptions.- 4.1 The Use of Exceptions.- Problem A: Implementing a Control Structure (Zahn’s Construct).- Problem B: Handling Expected Counter Wrap Around.- Problem C: Error Conditions in a Stack Package.- Problem D: Responding to Invalid Time Input.- Problem E: Handling Interface Malfunctions in a Message Switch.- Problem F: Unanticipated Message Validation Errors.- 5. Program Structure.- 5.1 Specifying Interfaces for General Purpose, Portable Software: A Study of Ada Input/Output.- Problem A: Preserving Implementation Freedom.- Problem B: Providing Parameters with Default Values.- Problem C: Assumptions about Underlying Hardware/Software Support.- Problem D: Error Recovery and Exceptions.- Problem E: Compiler-Dependent Specifications.- 5.2 Information Hiding.- Problem: A Clock Simulation for Message Interrupts.- 5.3 Reducing Depth of Nesting.- Problem A: Entries in a Message-Switch Log.- Problem B: Conditional Execution of Task Calls.- Problem C: Using Subunits to Condense a Complex Package Body.- 5.4 Library Units Versus Subunits.- Problem: The Modular Structure of a Message-Switch Program.- 6. Ada Life Cycle Design Methodology.- 6.1 Problem Analysis.- 6.2 Requirements Definition.- 6.3 High-Level Design.- 6.4 Low-Level Design.- 6.5 Coding.- 6.6 Unit Testing.- 6.7 Integration Testing.- 6.8 Acceptance Testing.- 6.9 Maintenance.- Appendix A. Areos for Future Study.- A.1 Design Issues.- A.2 Data Abstraction Issues.- A.3 Additional Naming Conventions.- A.4 Additional Coding Paradigms.- A.5 Operational Issues.- Appendix B. Bibliography.