Ring Buffer Exporter Component
The Ring Buffer component records events to the memory buffer. When the buffer is full, a fresh recorded event replaces the oldest event in the buffer. When an event is sent to the Ring Buffer's control topic, the content of the Ring Buffer is published. The published data includes the following:
- The topic used to publish an event
- The time at which the event was published in nanoseconds since the Epoch
- The event
Ring Buffer Configuration Variables
The following table describes the configuration variables that can be used with the Ring Buffer component:
| Parameter | Type | Description | Valid Values | Required |
|---|---|---|---|---|
| Bus | String | The name of the Bus component to use | The name of an existing Bus component | Y |
| Logger | String | The name of the Logger component to use | The name of an existing Logger component | N |
| Pattern | String | The pattern to match on the Bus component for subscription | Default: # | N |
| PubTopic | String | The name of the topic on which to publish recorded events | Default: ring/data | N |
| ControlTopic | String |
The name of the topic on which to receive an event to trigger publication
The content of the triggering event is ignored |
Default: ring/control | N |
| BufferSize | Unsigned Integer | The maximum number of events held in the ring buffer | Default: 500 | N |