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What are channel-exit programs?

 

Channel-exit programs are called at defined places in the processing carried out by MCA programs.

Some of these user-exit programs work in complementary pairs. For example, if a user-exit program is called by the sending MCA to encrypt the messages for transmission, the complementary process must be functioning at the receiving end to reverse the process.

The different types of channel-exit program are described below. Table 1 shows the types of channel exit that are available for each channel type.

Channel exits available for each channel type

Channel Type	Message exit	Message- retry exit	Receive exit	Security exit	Send exit	Auto- definition exit
Sender channel	Yes		Yes	Yes	Yes
Server channel	Yes		Yes	Yes	Yes
Cluster- sender channel	Yes		Yes	Yes	Yes	Yes
Receiver channel	Yes	Yes	Yes	Yes	Yes	Yes
Requester channel	Yes	Yes	Yes	Yes	Yes
Cluster- receiver channel	Yes	Yes	Yes	Yes	Yes	Yes
Client- connection channel			Yes	Yes	Yes
Server- connection channel			Yes	Yes	Yes	Yes
Notes: On z/OS, the auto-definition exit applies to cluster-sender and cluster-receiver channels only.

If you are going to run channel exits on a client, we cannot use the MQSERVER environment variable. Instead, create and reference a client channel definition table as described in the WebSphere MQ Clients book.

• Processing overview
  

• Channel security exit programs
  

• Channel send and receive exit programs
  

• Channel send exit programs — reserving space
  

• Channel message exit programs
  

• Channel message retry exit program
  

• Channel auto-definition exit program
  

 

Parent topic:

Channel-exit programs

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