216

Developing Client Applications to Use a Web Service

JAXR

Registry

Lookup

Client

Publishes

JAX RPC API

Call Interface

Web Service

JAX RPC Runtime

Figure 5.7

DII Call Interface

Using the DII 

Call

 interface allows a client application to define at runtime

the service name and the operations it intends to call on the service, thus giving

the client the benefit of loosely coupling its code with that of the service. The

client is less affected by changes to the service, whether those changes involve

access to the service or data requirements. In addition, the DII communication

model permits Web service access code to be standardized among a set of clients

and reused as a component.

E

DII involves more work than stubs or dynamic proxies and should be used 

sparingly. You may consider using this mode if a service changes frequently.