Publish REST service module

Publish a service with one resource.

To publish a service, in the service's main module you code to:
  1. Import the service module.
  2. Call on the com.WebServiceEngine.RegisterRestService() method to register the service.
  3. Call on the com.WebServiceEngine.ProcessServices() method to start the service.

Web service main module

This is an example of a module that runs a Web service. The IMPORT FGL statement imports the service module, "serviceModule".

In the call to the RegisterRestService() method, the GWS REST engine registers the Web service module as a REST service. In the example, "MyService" is the public name of the REST service, which users will see in the service's URI endpoints.

In the call to ProcessServices(), the service process starts within a WHILE loop. The GWS REST engine processes requests for resources and handles Web service engine errors. The Web service runs until interrupted. 

IMPORT com
IMPORT FGL serviceModule

MAIN
  DEFINE ret INTEGER
  DEFER INTERRUPT
  CALL com.WebServiceEngine.RegisterRestService("serviceModule", "MyService")
  DISPLAY "Server started"
  CALL com.WebServiceEngine.Start()
  CONNECT TO "myDatabase""+driver='dbmsqt'"
  WHILE TRUE
    LET ret = com.WebServiceEngine.ProcessServices(-1)
    CASE ret
       WHEN 0
         DISPLAY "Request processed." 
       WHEN -1
         DISPLAY "Timeout reached."
       WHEN -2
         DISPLAY "Disconnected from application server."
         EXIT PROGRAM   # The Application server has closed the connection
       WHEN -3
         DISPLAY "Client Connection lost."
       WHEN -4
         DISPLAY "Server interrupted with Ctrl-C."
       WHEN -9
         DISPLAY "Unsupported operation."
       WHEN -10
         DISPLAY "Internal server error."
       WHEN -23
         DISPLAY "Deserialization error."
       WHEN -35
         DISPLAY "No such REST operation found."
       WHEN -36
         DISPLAY "Missing REST parameter."
       OTHERWISE 
         DISPLAY "Unexpected server error " || ret || "."
        EXIT WHILE 
     END CASE
     IF int_flag<>0 THEN
       LET int_flag=0
       EXIT WHILE
     END IF     
  END WHILE
  DISPLAY "Server stopped"
END MAIN