Add Annotation configuration support for Continuous Queries [DATAGEODE-38]

[spring-projects-issues]

John Blum opened DATAGEODE-38 and commented

After building an example (CQ with JavaConfig) in the Spring GemFire Examples project showing how to configure SDG's Continuous Queries infrastructure support in JavaConfig, I realized that I could add additional support in thew new Annotation configuration model to simplify the setup and configuration of registers CQs and Listeners/callbacks that process CQ events.

Essentially, I will introduce 2 new Annotations, @EnableContinuousQueries to enable the SDG CQ infrastructure along with @ContinuousQuery.

@ContinuousQuery will be a POJO method-level annotation meant to defined the CQ query and handler method that should be called back upon receiving a CQ event for that particular query.

For example...

class MyApplicationContinuousQueriesAndHandlers {

  @ContinuousQuery(query = "SELECT * FROM /Orders o WHERE o.total > 1000")
   public void handleExpensiveOrders(CqEvent event) {
       ...
    }

The user can enable CQ using the @EnableContinuousQueries annotation, as stated above, like so...

@Configuration
@EnableContinuousQueries
class ApplicationConfiguration {
...
}

This will be very similar to the core Spring Framework's "Annotation driven listener endpoints"

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No further details from DATAGEODE-38