DataStorm.Topic.*

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DataStorm.Topic.SampleLifetime

Synopsis

DataStorm.Topic.SampleLifetime=num

Description

This property defines the lifetime in milli-seconds of samples queued in the writer or reader sample queue. Samples older that the lifetime are automatically removed from the reader or writer queue. The default lifetime is 0 which is the same as an infinite lifetime.

DataStorm.Topic.SampleCount

Synopsis

DataStorm.Topic.SampleCount=num

Description

This property defines the maximum number of samples queued in the writer or reader sample queue. If the maximum is reached, oldest samples are removed to make room for new samples in the queue. A negative value is equivalent to an infinite sample count. If set to 0, samples are not queued. If not defined, the default value is .

DataStorm.Topic.ClearHistory

Synopsis

DataStorm.Topic.ClearHistory=value

Description

This property determines when the reader or writer sample history is cleared. Legal values and their description are presented in the table below:

Value Description

OnAdd

Clear the sample history when a Add sample is received.
OnRemove Clear the sample history when a Remove sample is received.
OnAll Clear the sample history when a new sample is received.
OnAllExceptPartialUpdates Clear the sample history when a new sample which is not a partial update is received.
Never Never clear the sample history.

If not defined, the default value OnAll.

DataStorm.Topic.DiscardPolicy

Synopsis

DataStorm.Topic.DiscardPolicy=value

Description

This property specifies how samples might be discarded by a reader.

Value Description
Never Samples are never discarded.
SendTime A sample is discarded if its timestamp is older than the last received sample timestamp.
Priority A sample is discarded if it's received from writer with a lower priority than the highest priority connected writer.

If not defined, the default value is Never.

DataStorm.Topic.Priority

Synopsis

DataStorm.Topic.Priority=num

Description

This property specifies the priority assigned to the topic's writers. If not defined, the default value is 0.