HW18: Chapter 18
18.4 Define an interface specification for the Currency Converter and Check credit rating services shown in Figure 18.7
In this case we are talking about a programmatic web service interface which defines the data available and how it can be accessed and used.
Currency Converter
| Operation | Inputs | Outputs | Exceptions |
| ConvertCurrency | curIn Original Currency, New Currency, Amount | curOut New Amount, New Currency | curFault Invalid Amount, Invalid Currency Type |
| ListCurrency | numIn Maximum number | numOut URL of page with list of valid currency types up to maximum number | listFault Maximum number must be a positive integer |
| SearchCurrency | searchIn Currency Type | searchOut URL of page with search results | searchFault Invalid currency type |
Check Credit Rating Services
| Operation | Inputs | Outputs | Exceptions |
| ListRatingServices | numIn Maximum number | numOut URL of page with list of valid rating services up to maximum number | listFault Maximum number must be a positive integer |
| CheckCreditRating | credIn Social Security, Rating Service code | credOut URL of page with Credit Rating score and how that compares to rest of population | curFault Invalid social security, Invalid rating service code |