96
Designing a Service's Interaction Layer
Interaction Layer
Processing Layer
JM
Business
Web
Web
S
Logic
Service
Service
Client
Endpoint
Figure 3.7
Asynchronous Interaction Between Client and Service
Figure 3.8 shows how the travel agency service might implement this interac 
tion, and Code Example 3.16 shows the actual code that might be used.
Travel Agency 
Processing
Client
JMS Queue/Topic
Service Endpoint
Layer
Request travel reservation
Delegate request to JMS
after validation
Return correlation ID
Request
Inquire 
Option 1: Polling
Status/result
Option 2: Callback
Request result
Figure 3.8
Travel Agency Service Interaction






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