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TIBCO Rendezvous® 8.7.0

# TibrvFtMonitor()

Constructor

## Declaration

    TibrvFtMonitor(
        TibrvQueue                queue,
        TibrvFtMonitorCallback    callback,
        TibrvTransport            transport,
        java.lang.String          groupName,
        double                    lostInterval,
        java.lang.Object          closure)
      throws TibrvException

## Purpose

Monitor a fault tolerance group.

## Remarks

The monitor callback method receives the number of active members as an argument.

The group need not have any members at the time of this constructor call.

Parameter | Description
`queue` | Place events for this monitor on this event queue.
`callback` | On dispatch, process the event with this callback method.
`transport` | Listen on this transport for fault tolerance internal protocol messages (such as heartbeat messages).
`groupName` | Monitor the fault tolerant group with this name. The group name must conform to the syntax required for Rendezvous subject names. For details, see Subject Names on page 37 in TIBCO Rendezvous Concepts. See also, Group Name.
`lostInterval` | When the heartbeat signal from an active member has been silent for this interval (in seconds), Rendezvous fault tolerance software considers that member lost, and queues a monitor event. The interval must be positive. To determine the correct value, see Step 4: Choose the Intervals on page 207 in TIBCO Rendezvous Concepts. See also, Lost Interval.
`closure` | Store this closure data in the monitor object.

## Lost Interval

The monitor uses the `lostInterval` to determine whether a member is still active. When the heartbeat signal from an active member has been silent for this interval (in seconds), the monitor considers that member lost, and queues a monitor event.

We recommend setting the `lostInterval` identical to the group’s `activationInterval`, so the monitor accurately reflects the behavior of the group members.

## Group Name

The group name must be a legal Rendezvous subject name (see Subject Names on page 37 in TIBCO Rendezvous Concepts). You may use names with several elements; for examples, see Multiple Groups on page 191 in TIBCO Rendezvous Concepts.

## See Also

TibrvFtMonitorCallback.

TibrvFtMonitor.destroy().

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