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TIBCO Rendezvous® 8.8.0

# FTGroupMonitor

Class

## Superclasses

    System.Object
      FTGroupMonitor

## Visual Basic

    Public Class FTGroupMonitor

## C#

    public class FTGroupMonitor

## Purpose

Monitor a fault tolerance group.

## Remarks

Upon creating this object, the program monitors a fault tolerance group.

Monitors are passive—they do not affect the group members in any way.

Rendezvous fault tolerance software queues a monitor event whenever the number of active members in the group changes—either it detects a new heartbeat, or it detects that the heartbeat from a previously active member is now silent, or it receives a message from the fault tolerance component of an active member indicating deactivation or termination.

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

By destroying a monitor object, the program stops monitoring the fault tolerance group. The method FTGroupMonitor.Destroy destroys a monitor explicitly and immediately. You can also destroy a monitor implicitly by deleting all references to it, but the garbage collector might introduce a delay before it destroys the object.

Destroying the queue or transport of a monitor automatically destroys the monitor as well.

Member | Description |
## Public Instance Properties
``GroupName`` | ``string`` The instance monitors the fault tolerant group with this name. | Get
``Transport`` | `Transport` The group monitor uses this transport to receive fault tolerance internal protocol messages (such as heartbeat messages). | Get
## Public Events
``GroupStateChanged`` | GroupStateChangedEventHandler The number of active members in a group changed.

Method | Description | Page
FTGroupMonitor | Monitor a fault tolerance group. | FTGroupMonitor
FTGroupMonitor.Destroy | Stop monitoring a fault tolerance group, and free associated resources. | FTGroupMonitor.Destroy

## Related Classes

FTGroupMember

## See Also

GroupStateChangedEventHandler

Subtopics

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