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TIBCO Rendezvous® 8.7.0

# DELIVERY.UNAVAILABLE

Advisory

## Subject Name Syntax

    _RV.ERROR.RVCM.DELIVERY.UNAVAILABLE.subject

## Purpose

A listener presents this advisory when one or more messages are no longer available for retransmission.

## Remarks

Consider this example situation. Message number `49` arrives at the listener out of sequence—it has not yet received messages number `46`, `47` and `48`. Rendezvous software automatically requests that the sender retransmit messages `46`–`48`. However, the time-out has expired for those messages, and they are no longer available in the sender’s ledger. The listening transport first presents a `DELIVERY.UNAVAILABLE` advisory, indicating that messages `46–48` are lost; then it queues message `49`.

In this example a range of messages are unavailable. The advisory indicates this range by noting the sequence numbers of the first unavailable message (`seqno_begin` is `46`) and the last unavailable message (`seqno_end` is `48`). In a situation where only one message is unavailable, the fields `seqno_begin` and `seqno_end` both contain the same value.

The `subject` element is the subject name of the unavailable certified messages. The subject often consists of several elements, so the wildcard character `">"` (rather than `"*"`) is the correct way to match all subjects in this position.

## Message Fields

Field Name | Description
`subject` | The subject name of the unavailable certified messages. It is identical to the `subject` element. This field has datatype `TIBRVMSG_STRING.`
`seqno_begin` | The sequence number of the first unavailable message in the range. This field has datatype `TIBRVMSG_U64.`
`seqno_end` | The sequence number of the last unavailable message in the range. This field has datatype `TIBRVMSG_U64.`
`sender` | The name of the sender that cannot retransmit the message. This field has datatype `TIBRVMSG_STRING.`

## Diagnosis

This advisory indicates an error, and reports unexpected and usually undesirable behavior.

`DELIVERY.UNAVAILABLE` advisories can indicate either of these difficulties:

| • | The physical network is unreliable.

| • | The sending program is using a time-out value that is too low.

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