Programming an Oracle Tuxedo Application Using COBOL

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Writing Request/Response Clients and Servers

This topic includes the following sections:

 


Overview of Request/Response Communication

In request/response communication mode, one software module sends a request to a second software module and waits for a response. Because the first software module performs the role of the client, and the second, the role of the server, this mode is also referred to as client/server interaction. Many online banking tasks are programmed in request/response mode. For example, a request for an account balance is executed as follows:

  1. A customer (the client) sends a request for an account balance to the Account Record Storage System (the server).
  2. The Account Record Storage System (the server) sends a reply to the customer (the client), specifying the dollar amount in the designated account.
  3. Figure 6-1 Example of Request/Response Communication in Online Banking


    Example of Request/Response Communication in Online Banking

Once a client process has joined an application, it can then send the request message to a service subroutine for processing and receive a reply message.

 


Sending Synchronous Messages

The TPCAL L(3cbl) call sends a request to a service subroutine and synchronously waits for a reply. Use the following signature to call the TPCALL routine:

01 TPSVCDEF-REC.
COPY TPSVCDEF.
01 ITPTYPE-REC.
COPY TPTYPE.
01 IDATA-REC.
COPY User Data.
01 OTPYTPE-REC.
COPY TPTYPE.
01 ODATA-REC.
COPY User Data.
01 TPSTATUS-REC.
COPY TPSTATUS.
CALL "TPCALL" USING TPSVCDEF-REC
ITPTYPE-REC
IDATA-REC
OTPTYPE-REC
ODATA-REC
TPSTATUS-REC
.

For more information on the TPSVCDEF data structure, refer to Programming Oracle Tuxedo ATMI Applications Using C. The IDATA-REC and ITPTYPE-REC structures define the request record. The ODATA-REC and OTPTYPE-REC structures define the reply record. The ITPTYPE-REC and OTPTYPE-REC data structures are similar to the TPTYPE-REC data structure.

TPCALL waits for the expected reply.

Note: Calling the TPCALL routine is logically the same as calling the TPACALL routine, immediately followed by TPGETRPLY, as described in Sending Asynchronous Messages.

The request carries the priority set by the system for the specified service (SERVICE-NAME) unless a different priority has been explicitly set by a call to the TPSPRIO routine (described in Setting and Getting Message Priorities).

TPCALL returns an integer. On failure, the value of TP-STATUS is set to a value that reflects the type of error that occurred. For information on valid error codes, refer to TPCALL(3cbl) in the Oracle Tuxedo ATMI COBOL Function Reference.

Note: Communication calls may fail for a variety of reasons, many of which can be corrected at the application level. Possible causes of failure include: application defined errors (TPESVCFAIL), errors in processing return arguments (TPESVCERR), typed record errors (TPEITYPE, TPEOTYPE), timeout errors (TPETIME), and protocol errors (TPEPROTO), among others. For a detailed discussion of errors, refer to “Managing Errors” in Programming Oracle Tuxedo ATMI Applications Using C. For a complete list of possible errors, refer to TPC ALL(3cbl) in the Oracle Tuxedo ATMI COBOL Function Reference.

The Oracle Tuxedo system automatically adjusts a record used for receiving a message if the received message is too large for the allocated record. You should test for whether or not the reply records have been resized.

To access the new size of the record, use the address returned in *LEN IN OTPTYPE-REC. To determine whether a reply record has changed in size, compare the size of the reply record before the call to TPCALL with the value of LEN IN OTPTYPE-REC after its return. If LEN IN OTPTYPE-REC is larger than the original size, the record has grown. If not, the record size has not changed.

Example: Using the Same Record for Request and Reply Messages

The following example shows how the client program makes a synchronous call using the same record for both the request and reply messages. In this case, using the same record is appropriate because the AUDV-REC message record has been set up to accommodate both request and reply information. The following actions are taken in this code:

  1. The service queries the B_ID field, but does not overwrite it.
  2. The application initializes the BALANCE field to zero in preparation for the values to be returned by the service.
  3. The SERVICE-NAME represents the service name requested. In this example, these variables represent account and teller, respectively.
  4. Listing 6-1 Using the Same Record for Request and Reply Messages
    WORKING-STORAGE SECTION.
    *****************************************************
    * Tuxedo definitions
    *****************************************************
      01 TPTYPE-REC.
      COPY TPTYPE.
    *
      01 TPSTATUS-REC.
      COPY TPSTATUS.
    *
      01 TPSVCDEF-REC.
      COPY TPSVCDEF.
    *****************************************************
    * Log messages definitions
    *****************************************************
      01 LOGMSG.
         05 FILLER PIC X(6) VALUE "FIG =>".
         05 LOGMSG-TEXT PIC X(50).
      01 LOGMSG-LEN PIC S9(9) COMP-5.
    *
      01 USER-DATA-REC PIC X(75).
    *****************************************************
    * This VIEW record (audv) will be sent to the server
    *****************************************************
      01 AUDV-REC.
      COPY AUDV.
    *
    ******************************************************
      PROCEDURE DIVISION.
      START-FIG.
      MOVE LENGTH OF LOGMSG TO LOGMSG-LEN.
    *****************************************************
    * Prepare the audv record
    *****************************************************
      MOVE "BRANCH" TO B-ID IN AUDV-REC.
      MOVE 0 TO BALANCE IN AUDV-REC.
      MOVE LENGTH OF AUDV-REC TO LEN.
      MOVE "VIEW" TO REC-TYPE.
      MOVE "audv" TO SUB-TYPE.
      MOVE "SOMESERVICE" TO SERVICE-NAME.
      SET TPBLOCK TO TRUE.
      SET TPNOTRAN TO TRUE.
      SET TPNOTIME TO TRUE.
      SET TPSIGRSTRT TO TRUE.
      SET TPNOCHANGE TO TRUE.
      CALL "TPCALL" USING TPSVCDEF-REC
                    TPTYPE-REC
                    AUDV-REC
                    TPTYPE-REC
                    AUDV-REC
                    TPSTATUS-REC.
      IF NOT TPOK
             MOVE "Service Failed" TO LOGMSG-TEXT
             PERFORM DO-USERLOG
             PERFORM EXIT-PROGRAM.
      DISPLAY BRANCH and BALANCE
      . . .

If the reply is larger than ODATA-REC, then ODATA-REC contains as much of the message as fits in the record. The remainder is discarded and TPCALL sets TP-STATUS IN TPSTATUS-REC to TPTRUNCATE.

Example: Sending a Synchronous Message with TPSIGRSTRT Set

The following example is based on the TRANSFER service, which is part of the XFER server process of bankapp. (bankapp is a sample ATMI application delivered with the Oracle Tuxedo system.) The example is based on a service that assumes the role of a client when it calls the WITHDRAWAL and DEPOSIT services. The application sets the communication flag to TPSIGRSTRT in these service calls to give the transaction a better chance of committing. The TPSIGRSTRT flag specifies the action to take if there is a signal interrupt. For more information on communication flags, refer to TPCALL (3cbl) in the Oracle Tuxedo ATMI COBOL Function Reference.

Listing 6-2 Sending a Synchronous Message with TPSIGRSTRT Set
   WORKING-STORAGE SECTION.
*****************************************************
* Tuxedo definitions
*****************************************************
   01 TPTYPE-REC.
   COPY TPTYPE.
*
   01 TPSTATUS-REC.
   COPY TPSTATUS.
 *
   01 TPSVCDEF-REC.
   COPY TPSVCDEF.
*****************************************************
* This VIEW record (audv) will be sent to the server
*****************************************************
   01 AUDV-REC.
   COPY AUDV.
*
******************************************************
   PROCEDURE DIVISION.
 START-FIG.
*****************************************************
* Prepare the audv record for withdrawal
*****************************************************
  . . .
  MOVE "WITHDRAWAL" TO SERVICE-NAME.
  SET TPSIGRSTRT TO TRUE.
  PERFORM DO-TPCALL.
  IF NOT TPOK
         MOVE "Cannot withdraw from debit account" TO LOGMSG-TEXT
         PERFORM DO-USERLOG
         PERFORM EXIT-PROGRAM.
  MOVE "DEPOSIT" TO SERVICE-NAME.
  SET TPSIGRSTRT TO TRUE.
  PERFORM DO-TPCALL.
  IF NOT TPOK
         MOVE "Cannot deposit into credit account" TO LOGMSG-TEXT
         PERFORM DO-USERLOG
         PERFORM EXIT-PROGRAM.
  . . .
*****************************************************
* Perform a TPCALL
*****************************************************
DO-TPCALL.
   MOVE LENGTH OF AUDV-REC TO LEN.
   MOVE "VIEW" TO REC-TYPE.
   MOVE "audv" TO SUB-TYPE.
   SET TPBLOCK TO TRUE.
   SET TPNOTRAN TO TRUE.
   SET TPNOTIME TO TRUE.
   SET TPNOCHANGE TO TRUE.
   CALL "TPCALL" USING TPSVCDEF-REC
                  TPTYPE-REC
                  AUDV-REC
                  TPTYPE-REC
                  AUDV-REC
                  TPSTATUS-REC.
   . . .

Example: Sending a Synchronous Message with TPNOTRAN Set

The following example illustrates a communication call that suppresses transaction mode. The call is made to a service that is not affiliated with a resource manager; it would be an error to allow the service to participate in the transaction. The application prints an accounts receivable report, ACCRV, generated from information obtained from a database named ACCOUNTS.

The service routine REPORT interprets the specified parameters and sends the byte stream for the completed report as a reply. The client uses TPCALL to send the byte stream to a service called PRINTER, which, in turn, sends the byte stream to a printer that is conveniently close to the client. The reply is printed. Finally, the PRINTER service notifies the client that the hard copy is ready to be picked up.

Note: The example Sending an Asynchronous Message with TPNOTRAN or TPNOREPLY shows a similar example using an asynchronous message call.
Listing 6-3 Sending a Synchronous Message with TPNOTRAN Set
    WORKING-STORAGE SECTION.
*****************************************************
* Tuxedo definitions
*****************************************************
    01 ITPTYPE-REC.
    COPY TPTYPE.
    01 OTPTYPE-REC.
    COPY TPTYPE.
*
    01 TPSTATUS-REC.
    COPY TPSTATUS.
*
    01 TPSVCDEF-REC.
    COPY TPSVCDEF.
*****************************************************
    01 REPORT-REQUEST PIC X(100) VALUE SPACES.
    01 REPORT-OUTPUT PIC X(50000) VALUE SPACES.
******************************************************
    PROCEDURE DIVISION.
  START-FIG.
    . . .
    join application
    start transaction
    . . .
********************************************************
* Send report request to REPORT service
* Receive results into REPORT-OUTPUT
********************************************************
    MOVE "REPORT=accrcv DBNAME=accounts" TO REPORT-REQUEST.
    MOVE "STRING" TO REC-TYPE IN ITYPE-REC.
    MOVE 29 TO LEN IN ITYPE-REC.
    MOVE "STRING" TO REC-TYPE IN OITYPE-REC.
    MOVE 50000 TO LEN IN OTYPE-REC.
    MOVE "REPORT" TO SERVICE-NAME.
    SET TPTRAN TO TRUE.
    SET TPBLOCK TO TRUE.
    SET TPNOTIME TO TRUE.
    SET TPSIGRSTRT TO TRUE.
    SET TPNOCHANGE TO TRUE.
    CALL "TPCALL" USING TPSVCDEF-REC
                  ITPTYPE-REC
                  REPORT-REQUEST
                  OTPTYPE-REC
                  REPORT-OUTPUT
                  TPSTATUS-REC.
    IF NOT TPOK
       error processing
    IF TPETRUNCATE
       The report was truncated
       error processing
********************************************************
* Send REPORT-OUTPUT to PRINTER service
********************************************************
    MOVE "PRINTER" TO SERVICE-NAME.
    SET TPNOTRAN TO TRUE.
    MOVE "STRING" TO REC-TYPE IN ITTYPE-REC.
    MOVE LEN IN OTYPE-REC TO LEN IN ITYPE-REC.
    CALL "TPCALL" USING TPSVCDEF-REC
                  ITPTYPE-REC
                  REPORT-OUTPUT
                  OTPTYPE-REC
                  REPORT-OUTPUT
                  TPSTATUS-REC.
    IF NOT TPOK
          error processing
    . . .
         terminate transaction
          leave application
Note: In the preceding example, the term error routine indicates that the following tasks are performed: an error message is printed, the transaction is aborted, the client leaves the application, and the program is exited.

This example also shows how the TPNOCHANGE communication setting is used to enforce strong record type checking by indicating that the reply message must be returned in the same type of record that was originally allocated. The strong type check flag, TPNOCHANGE, forces the reply to be returned in a record of type STRING.

A possible reason for this check is to guard against errors that may occur in the REPORT service subroutine, resulting in the use of a reply record of an incorrect type. Another reason is to prevent changes that are not made consistently across all areas of dependency. For example, another programmer may have changed the REPORT service to standardize all replies in another STRING format without modifying the client process to reflect the change.

 


Sending Asynchronous Messages

This section explains how to:

The type of asynchronous processing discussed in this section is sometimes referred to as fan-out parallelism because it allows a client’s requests to be distributed (or “fanned out”) simultaneously to several services for processing.

The other type of asynchronous processing supported by the Oracle Tuxedo system is pipeline parallelism in which the TPFORWAR routine is used to pass (or forward) a process from one service to another. For a description of the TPFORWAR routine, refer to “Writing Servers” in Programming Oracle Tuxedo ATMI Applications Using C.

Sending an Asynchronous Request

The TPACA LL(3cbl) routine sends a request to a service and immediately returns. Use the following signature to call the TPACALL routine:

01 TPSVCDEF-REC.
COPY TPSVCDEF.
01 TPTYPE-REC.
COPY TPTYPE.
01 DATA-REC.
COPY User Data.
01 TPSTATUS-REC.
COPY TPSTATUS.
CALL "TPACALL" USING TPSVCDEF-REC TPTYPE-REC DATA-REC TPSTATUS-REC.

For more information on the TPSVCDEF and TPTYPE-REC data structures, refer to “Defining a Service” in Programming Oracle Tuxedo ATMI Applications Using C.

The TPACALL routine sends a request message to the service named in the SERVICE-NAME and immediately returns from the call. Upon successful completion of the call, the TPACALL routine returns an integer that serves as a communication handle used to access the correct reply for the relevant request. While TPACALL is in transaction mode (as described in “Writing Global Transactions” in Programming Oracle Tuxedo ATMI Applications Using C) there may not be any outstanding replies when the transaction commits; that is, within a given transaction, for each request for which a reply is expected, a corresponding reply must eventually be received.

If the value TPNOREPLY is set, the parameter signals to TPACALL that a reply is not expected. When set, on success TPACALL returns a value of 0 as the reply descriptor. If subsequently passed to the TPGETRPLY routine, this value becomes invalid, this value becomes invalid. Guidelines for using this setting correctly when a process is in transaction mode are discussed in “Writing Global Transactions” in Programming Oracle Tuxedo ATMI Applications Using C.

On error, TPACALL sets TP-STATUS to a value that reflects the nature of the error. TPACALL returns many of the same error codes as TPCALL. The differences between the error codes for these functions are based on the fact that one call is synchronous and the other, asynchronous. These errors are discussed at length in “Managing Errors” in Programming Oracle Tuxedo ATMI Applications Using C.

The following example shows how TPACALL uses the TPNOTRAN and TPNOREPLY settings. This code is similar to the code in Example: Sending a Synchronous Message with TPNOTRAN Set. In this case, however, a reply is not expected from the PRINTER service. By setting both TPNOTRAN and TPNOREPLY, the client is indicating that no reply is expected and the PRINTER service will not participate in the current transaction. This situation is discussed more fully in “Managing Errors” in Programming Oracle Tuxedo ATMI Applications Using C.

Listing 6-4 Sending an Asynchronous Message with TPNOTRAN or TPNOREPLY
   WORKING-STORAGE SECTION.
*****************************************************
* Tuxedo definitions
*****************************************************
   01 ITPTYPE-REC.
   COPY TPTYPE.
   01 OTPTYPE-REC.
   COPY TPTYPE.
*
   01 TPSTATUS-REC.
   COPY TPSTATUS.
*
   01 TPSVCDEF-REC.
   COPY TPSVCDEF.
*****************************************************
   01 REPORT-REQUEST PIC X(100) VALUE SPACES.
   01 REPORT-OUTPUT PIC X(50000) VALUE SPACES.
******************************************************
   PROCEDURE DIVISION.
START-FIG.
   . . .
    join application
    start transaction
. . .
********************************************************
* Send report request to REPORT service
* Receive results into REPORT-OUTPUT
********************************************************
    MOVE "REPORT=accrcv DBNAME=accounts" TO REPORT-REQUEST.
    MOVE "STRING" TO REC-TYPE IN ITPTYPE-REC.
    MOVE 29 TO LEN IN ITPTYPE-REC.
    MOVE "STRING" TO REC-TYPE IN OITYPE-REC.
    MOVE 50000 TO LEN IN OTPTYPE-REC.
    MOVE "REPORT" TO SERVICE-NAME.
    SET TPTRAN TO TRUE.
    SET TPBLOCK TO TRUE.
    SET TPNOTIME TO TRUE.
    SET TPSIGRSTRT TO TRUE.
    SET TPREPLY TO TRUE.
    SET TPNOCHANGE TO TRUE.
    CALL "TPCALL" USING TPSVCDEF-REC
                  ITPTYPE-REC
                  REPORT-REQUEST
                  OTPTYPE-REC
                  REPORT-OUTPUT
                  TPSTATUS-REC.
    IF NOT TPOK
       error processing
    IF TPETRUNCATE
       The report was truncated
       error processing
********************************************************
* Send REPORT-OUTPUT to PRINTER service
********************************************************
    MOVE "PRINTER" TO SERVICE-NAME.
    SET TPNOTRAN TO TRUE.
    SET TPNOREPLY TO TRUE.
    MOVE "STRING" TO REC-TYPE IN ITPTYPE-REC.
    MOVE LEN IN OTPTYPE-REC TO LEN IN ITPTYPE-REC.
    CALL "TPACALL" USING TPSVCDEF-REC
                    ITPTYPE-REC
                    REPORT-OUTPUT
                    TPSTATUS-REC.
    IF NOT TPOK
       error processing
    . . .
    commit transaction
    leave application

Getting an Asynchronous Reply

A reply to a service call can be received asynchronously by calling the TPGE TRPLY(3cbl) routine. The TPGETRPLY routine dequeues a reply to a request previously sent by TPACALL.

Use the following signature to call the TPGETRPLY routine:

01 TPSVCDEF-REC.
COPY TPSVCDEF.
01 TPTYPE-REC.
COPY TPTYPE.
01 DATA-REC.
COPY User Data.
01 TPSTATUS-REC.
COPY TPSTATUS.
CALL "TPGETRPLY" USING TPSVCDEF-REC TPTYPE-REC DATA-REC TPSTATUS-REC.

For more information on the TPSVCDEF and TPTYPE-REC data structures, refer to “Defining a Service” in Programming Oracle Tuxedo ATMI Applications Using C.

By default, the function waits for the arrival of the reply that corresponds to the value referenced by the communication handle. During this waiting interval, a blocking timeout may occur. A time-out occurs when TPGETRPLY fails and TP-STATUS is set to TPETIME (unless TPNOTIME is set).

 


Setting and Getting Message Priorities

Two ATMI calls allow you to determine and set the priority of a message request: TPSPRIO (3cbl) and TPGPRIO (3cbl). The priority affects how soon the request is dequeued by the server; servers dequeue requests with the highest priorities first.

This section describes:

Setting a Message Priority

The TPSPRI O(3cbl) routine enables you to set the priority of a message request.

The TPSPRIO routine affects the priority level of only one request: the next request to be sent by TPCALL or TPACALL, or to be forwarded by a service subroutine.

Use the following signature to call the TPSPRIO routine:

01 TPPRIDEF-REC.
COPY TPPRIDEF.
01 TPSTATUS-REC.
COPY TPSTATUS.
CALL "TPSPRIO" USING TPPRIDEF-REC TPSTATUS-REC.

Use the following signature for the TPPRIDEF-REC data structure.

05 PRIORITY     PIC S9(9) COMP-5.
05 PRIO-FLAG PIC S9(9) COMP-5.
88 TPABSOLUTE VALUE 0.
88 TPRELATIVE VALUE 1.

Table 6-1 describes the arguments to the TPSPRIO routine.

Table 6-1 TPSPRIO Routine Fields
Field
Description
PRIORITY
Integer indicating a new priority value. The effect of this argument is controlled by PRIO-FLAG. If PRIO-FLAG is set to 0, PRIORITY specifies a relative value and the sign accompanying the value indicates whether the current priority is incremented or decremented. Otherwise, the value specified indicates an absolute value and PRIORITY must be set to a value between 0 and 100. If you do not specify a value within this range, the system sets the value to 50.
PRIO-FLAG
Indicates whether the value of PRIORITY is treated as a relative value (0, the default) or an absolute value (TPABSOLUTE).

The following sample code is an excerpt from the TRANSFER service. In this example, the TRANSFER service acts as a client by sending a synchronous request, via TPCALL, to the WITHDRAWAL service. TRANSFER also invokes TPSPRIO to increase the priority of its request message to WITHDRAWAL, and to prevent the request from being queued for the WITHDRAWAL service (and later the DEPOSIT service) after waiting on the TRANSFER queue.

Listing 6-5 Setting the Priority of a Request Message
    WORKING-STORAGE SECTION.
*****************************************************
* Tuxedo definitions
*****************************************************
    01 TPTYPE-REC.
       COPY TPTYPE.
*
    01 TPSTATUS-REC.
       COPY TPSTATUS.
*
    01 TPSVCDEF-REC.
       COPY TPSVCDEF.
*
    01 TPPRIDEF-REC.
       COPY TPPRIDEF.
*****************************************************
    01 DATA-REC PIC X(100) VALUE SPACES.
******************************************************
    PROCEDURE DIVISION.
START-FIG.
    . . .
    join application
    . . .
    MOVE 30 TO PRIORITY.
    SET TPRELATIVE TO TRUE.
    CALL "TPSPRIO" USING TPPRIDEF-REC TPSTATUS-REC
    IF NOT TPOK
       error processing
    MOVE "CARRAY" TO REC-TYPE.
    MOVE 100 TO LEN.
    MOVE "WITHDRAWAL" TO SERVICE-NAME.
    SET TPTRAN TO TRUE .
    SET TPBLOCK TO TRUE .
    SET TPNOTIME TO TRUE .
    SET TPSIGRSTRT TO TRUE .
    SET TPREPLY TO TRUE .
    CALL "TPACALL" USING TPSVCDEF-REC
                     TPTYPE-REC
                     DATA-REC
                     TPSTATUS-REC.
    IF NOT TPOK
       error processing
    . . .
    leave application

Getting a Message Priority

The TPGPR IO(3cbl) routine enables you to get the priority of a message request.

Use the following signature to call the TPGPRIO routine:

01 TPPRIDEF-REC.
COPY TPPRIDEF.
01 TPSTATUS-REC.
COPY TPSTATUS.
CALL "TPGPRIO" USING TPPRIDEF-REC TPSTATUS-REC.

A requester can call the TPGPRIO routine after invoking the TPCALL or TPACALL routine to retrieve the priority of the request message. If a requester calls the function but no request is sent, the routine fails, setting TP-STATUS to TPENOENT. Upon success, TPGPRIO sets TP-STATUS to TPOK and returns an integer value in the range of 1 to 100 (where the highest priority value is 100).

If a priority has not been explicitly set using the TPSPRIO routine, the system sets the message priority to that of the service routine that handles the request. Within an application, the priority of the request-handling service is assigned a default value of 50 unless a system administrator overrides this value.

The following example shows how to determine the priority of a message that was sent in an asynchronous call.

Listing 6-6 Determining the Priority of the Sent Request
   WORKING-STORAGE SECTION.
*****************************************************
* Tuxedo definitions
*****************************************************
   01 TPTYPE-REC-1.
   COPY TPTYPE.
   01 TPTYPE-REC-2.
   COPY TPTYPE.
*
   01 TPSTATUS-REC.
   COPY TPSTATUS.
*
   01 TPSVCDEF-REC-1.
   COPY TPSVCDEF.
   01 TPSVCDEF-REC-2.
   COPY TPSVCDEF.
*
   01 TPPRIDEF-REC-1.
   COPY TPPRIDEF.
   01 TPPRIDEF-REC-2.
   COPY TPPRIDEF.
*****************************************************
   01 DATA-REC-1 PIC X(100) VALUE SPACES.
   01 DATA-REC-2 PIC X(100) VALUE SPACES.
******************************************************
   PROCEDURE DIVISION.
START-FIG.
   . . .
   join application
   populate DATA-REC1 and DATA-REC2 with send request
   . . .
   MOVE "CARRAY" TO REC-TYPE IN TYPE-REC-1.
   MOVE 100 TO LEN IN TYPE-REC-1.
   MOVE "SERVICE1" TO SERVICE-NAME IN TPSVCDEV-REC-1.
   SET TPTRAN TO TRUE IN TPSVCDEV-REC-1.
   SET TPBLOCK TO TRUE IN TPSVCDEV-REC-1.
   SET TPNOTIME TO TRUE IN TPSVCDEV-REC-1.
   SET TPSIGRSTRT TO TRUE IN TPSVCDEV-REC-1.
   SET TPREPLY TO TRUE IN TPSVCDEV-REC-1.
   CALL "TPACALL" USING TPSVCDEF-REC-1
                  TPTYPE-REC-1
                  DATA-REC-1
                  TPSTATUS-REC.
   IF NOT TPOK
      error processing
   CALL "TPGPRIO" USING TPPRIDEF-REC-1 TPSTATUS-REC
   IF NOT TPOK
      error processing
   MOVE "CARRAY" TO REC-TYPE IN TYPE-REC-2.
   MOVE 100 TO LEN IN TYPE-REC-2.
   MOVE "SERVICE2" TO SERVICE-NAME IN TPSVCDEV-REC-2.
   SET TPTRAN TO TRUE IN TPSVCDEV-REC-2.
   SET TPBLOCK TO TRUE IN TPSVCDEV-REC-2.
   SET TPNOTIME TO TRUE IN TPSVCDEV-REC-2.
   SET TPSIGRSTRT TO TRUE IN TPSVCDEV-REC-2.
   SET TPREPLY TO TRUE IN TPSVCDEV-REC-2.
   CALL "TPACALL" USING TPSVCDEF-REC-2
                  TPTYPE-REC-2
                  DATA-REC-2
                  TPSTATUS-REC.
   IF NOT TPOK
      error processing
   CALL "TPGPRIO" USING TPPRIDEF-REC-2 TPSTATUS-REC
   IF NOT TPOK
      error processing
   IF PRIORITY IN TPSVCDEF-REC-1 >= PRIORITY IN TPSVCDEF-REC-2
               PERFORM DO-GETREPLY1
               PERFORM DO-GETREPLY2
   ELSE
                    PERFORM DO-GETREPLY2
                    PERFORM DO-GETREPLY1
   END-IF.
   . . .
   leave application
DO-GETRPLY1.
   SET TPGETHANDLE TO TRUE IN TPSVCDEV-REC-1.
   SET TPCHANGE TO TRUE IN TPSVCDEV-REC-1.
   SET TPBLOCK TO TRUE IN TPSVCDEV-REC-1.
   SET TPNOTIME TO TRUE IN TPSVCDEV-REC-1.
   SET TPSIGRSTRT TO TRUE IN TPSVCDEV-REC-1.
   CALL "TPGETRPLY" USING TPSVCDEF-REC-1
                    TPTYPE-REC-1
                    DATA-REC-1
                    TPSTATUS-REC.
   IF NOT TPOK
            error processing
DO-GETRPLY2
   SET TPGETHANDLE TO TRUE IN TPSVCDEV-REC-2.
   SET TPCHANGE TO TRUE IN TPSVCDEV-REC-2.
   SET TPBLOCK TO TRUE IN TPSVCDEV-REC-2.
   SET TPNOTIME TO TRUE IN TPSVCDEV-REC-2.
   SET TPSIGRSTRT TO TRUE IN TPSVCDEV-REC-2.
   CALL "TPGETRPLY" USING TPSVCDEF-REC-2
                    TPTYPE-REC-2
                    DATA-REC-2
                    TPSTATUS-REC.
   IF NOT TPOK
             error processing

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