Chapter 3 Service Endpoint Design
93
Customer
Weather Web Service Endpoint
Processing Layer
Request weather information
Request weather information
Return weather information
Return weather information
Figure 3.5
Weather Information Service Interaction
The weather information service is a good example of a synchronous interac 
tion between a client and a service. When it receives a client's request, the weather
service must look up the required information and send back a response to the
client. This look up and return of the information can be achieved in a relatively
short time, during which the client can be expected to block and wait. The client
continues its processing only after it obtains a response from the service. (See
Figure 3.5.)
Interaction Layer
Processing Layer
Business
Web
Web
Logic
Service
Service
Client
Endpoint
Figure 3.6
Synchronous Interaction Between Client and Service
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