In what tier should my web service references be?

Question

I have the following structure in my web solution:

• Domain
• DataAccess
• ApplicationServices
• Web
• Tests

I have some application services that I am using to abstract some web services that I am using. (Specifically, I am bundling some shipping web services together into a single application service.) Should my Application Services layer reference the web services I am consuming, and the other tiers remain ignorant, or should I reference the web services in the Web and Tests tiers and inject the web services into the application service?

Answer 1

I would use a Service Gateway pattern to work with Web Services, so I would have another project called ServiceGateway as an additional tier to my application and this will be referenced by ApplciationServices, as stated here..