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Creating Continuous Queries Using Spring Data GemFire

To create continuous queries with the Spring Data GemFire library, you must have the following:

  • Spring Data GemFire v2.0.1 release
  • Spring Boot v2.0.0+

To create continuous queries, do the following items:

  • Specify attributes subscriptionEnabled and readyForEvents for the ClientCacheApplication annotation. Apply this annotation to the Spring Boot client application class:

    @ClientCacheApplication(name = "GemFireSpringApplication", readyForEvents = true,
      subscriptionEnabled = true)
    

    The annotation for a durable event queue for continuous queries also sets the durableClientId and keepAlive attributes. For example:

    @ClientCacheApplication(name = "GemFireSpringApplication",
      durableClientId = "durable-client-id", keepAlive = true,
      readyForEvents = true, subscriptionEnabled = true)
    
  • Annotate the method that handles the events to specify the query. To make the event queue durable across server failures and restarts, include the durable = true attribute in the annotation, as is done in the example:

    @Component
    public class ContinuousQuery {
    
        @ContinuousQuery(name = "yourQuery",
           query = "SELECT * FROM /yourRegion WHERE someAttribute == true",
           durable = true)
        public void handleChanges(CqEvent event) {
          //PERFORM SOME ACTION
        }
    }
    

    The class that contains the method with the @ContinuousQuery annotation must have the @Component annotation, such that the continuous query is wired up correctly for the server.

For more information, see the Spring Data GemFire documentation.

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