When a client sends an RPC, a typical mainframe server application (short transaction) performs the tasks listed in Table 1-2. The arrows in the table indicate code loops.
Task |
Function |
|---|---|
1. Prepare for incoming requests. Initialize the Gateway-Library environment. Specify the type of IMS TM transaction (used with IMS TM transactions only). |
TDINIT TDSETPT |
2. Accept the incoming request. Accept the incoming request. ← |
TDACCEPT |
3. Handle incoming parameters. Determine how many parameters were sent. Define variables for storing parameter information (datatype, length, data). → Retrieve the parameter (Loop until all parameters are retrieved). |
TDNUMPRM TDINFPRM TDRCVPRM |
4. Process the request. Perform the requested task(s). |
|
5. Prepare to return results to the client. → Set the length and address of each return parameter (Loop until all parameters are described). → Describe each column in a row to be returned (Loop until all columns are retrieved). |
TDSETPRM TDESCRIB |
6. Return data to the client. → Send data to the client, one row at a time (Loop until all rows are sent). Send the return parameters, tell the client when results are finished, and close the connection. |
TDSNDROW TDSNDDON |
7. End the conversation. Free the TDPROC structure. Free the MVS storage (required with IMS TM; optional but recommended with CICS). |
TDFREE TDTERM |
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