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.
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Parameter |
Description |
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Place events for this monitor on this event queue. |
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On dispatch, process the event with this callback method. |
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Listen on this transport for fault tolerance internal protocol messages (such as heartbeat messages). |
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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 . See also, Group Name. |
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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 . See also, Lost Interval. |
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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 ). You may use names with several elements; for examples, see Multiple Groups on page 191 in .