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TIBCO Rendezvous® 8.8.0

# tibrvcmEventCallback

Function Type

## Declaration

    typedef void (*tibrvcmEventCallback) (
        tibrvcmEvent        cmListener,
        tibrvMsg            message,
        void*               closure);

## Purpose

Programs define functions of this type to process inbound certified or labeled messages.

## Remarks

This callback function must also be able to process uncertified and unlabeled messages.

Parameter | Description
`cmListener` | This parameter receives the listener object. This object is identical to the certified listener object that the program created to begin listening.
`message` | The callback receives the inbound message in this parameter. If the inbound message is empty, this parameter receives a message that has no fields.
`closure` | This parameter receives the closure data, which the program supplied in the call that created the event object.

## CM Label Information

CM callback functions can use CM label information to discriminate these situations:

| • | If tibrvMsg_GetCMSender() returns status code TIBRV_NOT_FOUND, then the message uses the reliable protocol (that is, it was sent from an ordinary transport).

| • | If tibrvMsg_GetCMSender() returns TIBRV_OK, then the message uses the certified delivery protocol (that is, it is a labeled message, sent from a CM transport).

Once the CM callback function determines that the message uses the certified delivery protocol, it can discriminate further:

| — | If tibrvMsg_GetCMSequence() returns status code TIBRV_NOT_FOUND, then the listener is not registered for certified delivery from the sender.

| — | If tibrvMsg_GetCMSequence() returns TIBRV_OK, then a certified delivery agreement is in effect for this subject with the sender.

## See Also

tibrvcmEvent_CreateListener()

tibrvMsg_GetCMSender()

tibrvMsg_GetCMSequence()

tibrvMsg_GetCMTimeLimit()

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