HW18: Chapter 18

18.4. Define an interface specification for the currency converter and check credit rating services shown in figure 18.7.


Currency Converter
Operation
Description
Lookup
Display information on currency input
Compare
Allow user to compare multiple currency/exchange rates against one
Search
Allow user to search for currency based on country / location

Operation
Input
Output
Exception
Lookup
lookIn
Currency ID
Currency Name
lookOut
URL of page with currency information
lookFault
Invalid currency ID
Invalid Name/None found
Compare
compIn
PrimaryCurrencyID(1)
CurrencyID (Max 10)
Currency Name (Max 10)
compOut
URL of page with comparison search results
compFault
Invalid currency ID’s
Invalid Name/None
Search
searchIn
Search string
searchOut
URL of search results
searchFault
Invalid string input

Check Credit Rating
Operation
Description
Lookup
Display credit rating of individual based on ID
Search
Search through report for specific terms and displays instances of these items when found
MakeReport
Create a credit report based on the ID of user. Can be converted to PDF.

Operation
Input
Output
Exception
Lookup
lookIn
CreditAgency URL
SSN(ID?)
URL of page displaying individuals information
lookFault
SSN not found
CreditAgency URL invalid
Search
searchIn
Report URL
Search string
searchOut
URL of page displaying search results
searchFault
Invalid string input
No results
MakeReport
mrIn
SSN
CreditAgencyID (up to 3)
PDF-Flag
mrOut
URL of report for identified SSN
mrFault
Invalid SSN
Invalid CreditAgencyID

I think the most difficult part of this is trying to understand what the requirements for each of these services would be. For example, I know what I want to see on my credit report, but I'm not sure what type of information if valuable nor how the information is used at a company. The same can be said for currency conversions. I have used services such as XE.com for currency conversion and they have features that I think are valuable (such are switching the input's e.g., US Dollar > British Pound, British Pound > US Dollar.) but should this be implemented at the service level or in some other way.

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