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TIBCO Rendezvous® 8.8.0

# TibrvCmReviewCallback::onLedgerMsg()

Method

## Declaration

    virtual void* onLedgerMsg(
        TibrvCmTransport* cmTransport,
        const char* subject,
        TibrvMsg& msg,
        void* closure) = 0;

## Purpose

Programs define this method to process ledger review messages.

## Remarks

TibrvCmTransport::reviewLedger() calls this callback method once for each matching subject stored in the ledger.

To continue reviewing the ledger, return `NULL` from this callback method. To stop reviewing the ledger, return non-`NULL` from this callback method; TibrvCmTransport::reviewLedger() cancels the review and returns immediately.

Parameter | Description
`cmTransport` | This parameter receives the transport.
`subject` | This parameter receives the subject for this ledger item.
`msg` | This parameter receives a summary message describing the delivery status of messages in the ledger. The table Message Content describes the fields of the summary message.
`closure` | This parameter receives closure data that the program supplied to TibrvCmTransport::reviewLedger().

## Message Content

This callback method receives ledger summary messages with these fields.

Field Name | Description
`subject` | The subject that this message summarizes. This field has datatype `TIBRVMSG_STRING.`
`seqno_last_sent` | The sequence number of the most recent message sent with this subject name. This field has datatype `TIBRVMSG_U64.`
`total_msgs` | The total number of messages stored at this subject name. This field has datatype `TIBRVMSG_U32.`
`total_size` | The total storage (in bytes) occupied by all messages with this subject name. If the ledger contains several messages with this subject name, then this field sums the storage space over all of them. This field has datatype `TIBRVMSG_U64.`
`listener` | Each summary message can contain one or more fields named `listener`. Each `listener` field contains a nested submessage with details about a single registered listener. This field has datatype `TIBRVMSG_MSG.`
`listener.``name` | Within each `listener` submessage, the `name` field contains the name of the listener transport. This field has datatype `TIBRVMSG_STRING.`
`listener.``last_confirmed` | Within each `listener` submessage, the `last_confirmed` field contains the sequence number of the last message for which the listener confirmed delivery. This field has datatype `TIBRVMSG_U64.`

## See Also

TibrvCmTransport::reviewLedger()

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