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TIBCO Rendezvous® 8.8.0

# TibrvFtMonitorCallback::onFtMonitor()

## Declaration

    virtual void onFtMonitor(
        TibrvFtMonitor* ftMonitor,
        const char* groupName,
        tibrv_u32 numActiveMembers ) = 0;

## Purpose

Process fault tolerance events for a monitor.

## Remarks

A program must define a method of this type as a prerequisite to monitor a fault tolerance group. Programs register a monitor callback method with each call to `TibrvFtMonitor::create().`

Rendezvous fault tolerance software queues a monitor event whenever the number of active members in the group changes.

A program need not be a member of a group in order to monitor that group.

Parameter | Description
`ftMonitor` | This parameter receives the monitor object.
`groupName` | This parameter receives a string denoting the name of the fault tolerance group.
`numActiveMembers` | This parameter receives the number of group members now active.

## See Also

TibrvFtMonitor::create().

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