Re: UPS & AS/400 talking to each other

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

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Ian and James,

Re: MsgKey CHAR(4)

There are two ways to monitor a message queue.

1/ Write a break handling program.

2/ Write a program to receive messages.

The techniques are similar but the interface is different.  A break
handling program must accept three parameters:
        CHAR(10) message queue
        CHAR(10) message queue library
        CHAR(4) message key
The break handling program is attached to the message queue using the
CHGMSGQ command and it MUST receive the message that caused it to break
else it receives CPF2506.  A break handling program does not generally wait
to receive messages.  It is automatically invoked by the OS when a message
that equals or exceeds the break severity arrives on the message queue.
Once it processes the message that caused it to break it simply exits.  The
OS will call it again if another message causes the queue to break.  (It
gets a little more complex if you want to handle messages that arrive while
you are processing one of them.)

A receive message program does not require parameters and it generally
issues a RCVMSG command with a *MAX or specific wait period.  It also
generally loops back to the RCVMSG after processing the message.  It
generally does not use a message key because it has no way of knowing what
that is (at least until it has received the first message).

James' sample code looked like a receive message program rather than a
break handling program.  Examples of each and a discussion can be found in
the CL Programmer's Guide in Chapter 8.

Regards,
Simon Coulter.

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