0223 Events and Logs¶

Processing is often triggered when a specific event or situation occurs. There are also sources of data that provide a continuous feed of data - for example a sensor monitoring the temperature. This model introduces the different types of Assets associated with events and continuous data feeds.

Topic entity¶

A Topic is a type of DataSet that is accessed using a publish-subscribe event interface. There are processes that add events to the topic, and other processes that subscribe to the topic and receive a copy of each event that is added. It is shown as a data set because some topics are in memory and some make use of an underlying DataStore to provide a persistent/reliable delivery service.

The additional attributes for Topic are:

• topicName holds the fully qualified name of the topic. This frees up the name property to hold a shorter, more human-readable name.
• topicType identifies the type of topic. This may refer to its reliability or other features supported by the event broker.

KafkaTopic entity¶

Apache Kafka is a popular open source technology that provides support for Topics. There is a specific type for an Apache Kafka topic because there is a resource connector for Apache Kafka and this type identifies when it is appropriate to use this connector to access the topic contents.

SubscriberList entity and TopicSubscribers relationship¶

Some services manage a specific subscriber list. This is represented by the SubscriberList entity type. The links to the topics that the subscription refers to is represented by the TopicSubscribers relationship type.

LogFile entity¶

A LogFile entity is a subtype of DataFile that contains events that have been captured and stored. The purpose attribute describes the use of log file - for example, it is a debug log, audit log, ....

AssociatedLog relationship¶

The AssociatedLog relationship shows the Asset (typically a LogFile) where logging information for the linked Referenceable is located.

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