This topic explains discusses events in VMware GemFire for TAS.
The cluster within a VMware GemFire for Tanzu Application Service service instance can handle events. An app registers interest in a particular event, and when the server detects the event, an app-defined callback (also called a handler or a listener) is invoked to handle the event.
There are three aspects to configuring and implementing an event:
Continuous queries use an OQL query on region data to define an event. A change in query results is the event. The app registers both the query and the callback to set up a continuous query. Each region operation invokes the query, leading to the naming of this type of event handling as continuous.
See Querying with OQL for details on the Object Query Language (OQL) and generating queries.