Ü   Message queues

·         Message is information that is communicated between users, programs and workstation.

·         Message queue is storage for all the messages that are sent to users, programs or a workstation device.

·         We first of all store the message in this storage pool that is sent by a user, program or workstation and then as per the message type, we take the necessary action that suits the respective messages and send it back to different user, program or workstation.

 

Ü  Types of message queues

The system has different types of message queues:

·         workstation message queue

·         user profile message queue

·         job message queue

·         system operator message queue

·         history log message queue

 

Ø  Workstation message queues are used for sending and receiving messages between workstation users and between workstation users and the system operator. The name of the queue is the same as the name of the workstation. The queue is created by the system when the workstation is described to the system. This is permanent message queue.

 

Example: Sending message to a workstation

Here, we have given the workstation name as UKF, hence the same will be used as message queue for the workstation and any message intended to this workstation is sent to UKF.

 

SNDMSG   MSG('Do u want to continue the backup process') 
         TOMSGQ(UKF)
         MSGTYPE(*INQ) RPYMSGQ(*WRKSTN)

 

DSPMSG MSGQ(*WRKSTN)     

 

 


                             Display Messages
System:   UKFAI005
Queue . . . . . :   UKF                     Program . . . . :   *DSPMSG
Library . . . :     QSYS                    Library . . . :
Severity  . . . :   00                      Delivery  . . . :   *NOTIFY
 
Type reply (if required), press Enter.
From  . . . :   AJAISWAL       23/04/13   07:50:53
Do u want to continue the backup process
 Reply . . . __________________________________________________
 
                             
                                                                   Bottom
F3=Exit              F11=Remove a message                 F12=Cancel
F13=Remove all       F16=Remove all except unanswered     F24=More keys

 

 

We send the reply as ‘Y’. The reply is sent to the workstation as RPYMSGQ is *WRKSTN. We can check the reply as below.

 

 

 

DSPMSG MSGQ(*WRKSTN)     

 

 


                                Display Messages                               
                                                       System:   UKFAI005      
 Queue . . . . . :   UKF                     Program . . . . :   *DSPMSG       
   Library . . . :     QSYS                    Library . . . :                 
 Severity  . . . :   00                      Delivery  . . . :   *NOTIFY       
                                                                                
 Type reply (if required), press Enter.                                        
   From  . . . :   AJAISWAL       23/04/13   07:50:53                          
   Do u want to continue the backup process                                   
     Reply . . :   Y                                                           
                                            
 
                                                                    Bottom
 
 F3=Exit              F11=Remove a message                 F12=Cancel          
 F13=Remove all       F16=Remove all except unanswered     F24=More keys 

 

 

 

 

 

Ø  User profile message queues can be used for communication between users. User profile message queues are automatically created in library QUSRSYS when the user profile is created. This is permanent message queue. Whenever we log in, the message queue with the name as that of user is getting created as user profile message queue.

Example: Sending message to a user profile

 

Here, AJAISWAL is the message queue which the name of the user logged in.

 

SNDMSG MSG('Do u want to continue the process') 
       TOUSR(AJAISWAL) 
       MSGTYPE(*INQ) 
       RPYMSGQ(AMIT)  

 

 

DSPMSG MSGQ(*USRPRF)

 

 

 

 


                                Display Messages                               
                                                       System:   UKFAI005      
 Queue . . . . . :   AJAISWAL                Program . . . . :   *DSPMSG       
   Library . . . :     QUSRSYS                 Library . . . :                 
 Severity  . . . :   00                      Delivery  . . . :   *NOTIFY       
                                                                               
 Type reply (if required), press Enter.                                        
   From  . . . :   AJAISWAL       23/04/13   08:47:12                          
   Do u want to continue the process                                           
    Reply . . .  N                                                          
 
 
                                                
                                                                         Bottom
 F3=Exit              F11=Remove a message                 F12=Cancel          
 F13=Remove all       F16=Remove all except unanswered     F24=More keys       


 

 

We can see the reply message in the user profile AMIT.

 


                                Display Messages                               
                                                       System:   UKFAI005      
 Queue . . . . . :   AMIT                    Program . . . . :   *DSPMSG       
   Library . . . :     QUSRSYS                 Library . . . :                 
 Severity  . . . :   00                      Delivery  . . . :   *NOTIFY       
                                                                               
 Type reply (if required), press Enter.
   From  . . . :   AJAISWAL       23/04/13   08:47:12                          
   Do u want to continue the process                                           
     Reply . . :   N                                                           
                                                                                
                                                                               
                                                                              
                                                                         Bottom
 F3=Exit              F11=Remove a message                 F12=Cancel          
 F13=Remove all       F16=Remove all except unanswered     F24=More keys       


 

 

 

Ø  Job message queues are used for receiving requests to be processed (such as commands) and for sending messages that result from processing the requests; the messages are sent to the requester of the job. Job message queues exist for each job and only exist for the life of the job. Hence, it is a temporary message queue. Job message queues consist of an external message queue (*EXT) and program message queues.

 

As the program starts the system creates a message queue for that program, known as program message queue.

External message queue sends information to the external requester of the job who executed it. E.g. if there is any error it will be shown at the bottom of the screen.

 

Example: Sending message to external message queue

Ø  SNDPGMMSG   MSG ('THE END OF FILE IS REACHED') ==> It will display the msg at the bottom row.

 

 


                           Work with Members Using PDM                 USALID09
                                                                                
 File  . . . . . .   QRPGLESRC                                                 
   Library . . . .     AMIT                 Position to  . . . . .             
                                                                               
 Type options, press Enter.                                                    
  2=Edit         3=Copy  4=Delete 5=Display       6=Print     7=Rename         
  8=Display description  9=Save  13=Change text  14=Compile  15=Create module...
                                                                               
 Opt  Member      Type        Text                                             
      READFILE    CLLE                                                         
      READFILEO   CLLE                                                         
      REFER       PF          PHYSICAL FILE FOR REFERNCE                       
                                                                               
                                                                                
                                                                              
                                                                         Bottom
 Parameters or command                                                         
 ===>                                                                           
 F3=Exit          F4=Prompt             F5=Refresh            F6=Create        
 F9=Retrieve      F10=Command entry     F23=More options      F24=More keys
 THE END OF FILE IS REACHED     >>>>>>>>>>>>>>   

 

 

Ø  System operator message queue (QSYSOPR) is used for receiving and replying to messages from the system, display station users, and application programs. This is permanent message queue.

Example: Sending message to the system operator

The message queue name for the system operator is QSYSOPR. If we mention *SYSOPR, the message is sent to system operator message queue.

Any message sent to QSYSOPR automatically has a copy of the message sent to QHST.

 

SNDMSG MSG('The message sent to sys operator') TOUSR(*SYSOPR)

 

 

DSPMSG MSGQ(*SYSOPR)

 

 


                                Display Messages                               
                                                       System:   UKFAI005      
 Queue . . . . . :   QSYSOPR                 Program . . . . :   *DSPMSG       
   Library . . . :     QSYS                    Library . . . :                 
 Severity  . . . :   99                      Delivery  . . . :   *HOLD         
                                                                               
 Type reply (if required), press Enter.                                        
 
     The message sent to sys operator
 
 

 
                                                                         Bottom
 F3=Exit              F11=Remove a message                 F12=Cancel          
 F13=Remove all       F16=Remove all except unanswered     F24=More keys       


 

 

*** NOTE: Use DSPLOG to see the history log.

 

Ø  History log message queue is used for any job in the system to have a record of high-level system activities. This is permanent message queue.

 

Example: Sending message to history log

SNDMSG   MSG('Errors in the batch program at checkpoint 328.20')  TOMSGQ(QHST)

 

DSPLOG PERIOD(('01:01:01' '23/04/13') ('11:21:31' '22/04/13'))      

 

 


                          Display History Log Contents                         
 Job 725522/QSYS/CRTPFRDTA ended on 23/04/13 at 00:00:08; 2.738 seconds used;  
 Job 725643/QTMHHTTP/ADMIN started on 23/04/13 at 00:00:16 in subsystem QHTTPS 
 Job 725643/QTMHHTTP/ADMIN ended on 23/04/13 at 00:00:17; .028 seconds used; e 
 Errors in the batch program at checkpoint 328.20 …….. …..
 
 
 
 
                                                                        More...
 Press Enter to continue.                                                      
                                                                               
 F3=Exit   F10=Display all   F12=Cancel     


 

***NOTE: DSPMSG MSGQ(*WRKUSR)

It will display the messages that have been sent to workstation as well as the user.



 

 







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