AEM / CQ5上的Java批注（构造后和预销毁）

Question

Is it possible to use a method with the annotations @PostConstruct or @PreDestroy on the Service class of an OSGI Bundle in AEM 6, because I am planning to create a separate bundle for the database connectivity and the way I will use these 2 annotations is to open the database connection on the @PostConstruct and to close the connection and to perform to commit or rollback on the @PreDestroy . If it is not possible are there any other way or work around on the approach that I am planning?

Answer 1

OSGi uses a different set of annotations for handling the activation and deactivation of a bundle.

These are the @Activate and @Deactivate annotations from org.apache.felix.scr.annotations

For example:

@Component
public class Foo implements Bar {

   @Activate
   void activate(ComponentContext ctx) {
      System.out.println("Activating bundle: " + ctx.getUsingBundle());
   }

   @Deactivate
   void deactivate(ComponentContext ctx) {
      System.out.println("Deactivating bundle: " + ctx.getUsingBundle());
   }
}

For more information, check out the OSGi wiki

However, I don't think you should keep a database connection open throughout the entire lifecycle of the bundle. Just open and close it ad-hoc when you really need it.

What you should create when activating your bundle is not a connection but an object capable of building and maintaining a connection pool.

Google around for the DataSourceFactory interface

Also, I think AEM already provides a set of JDBC connectors OOTB. Be sure to check the Adobe documentation on the subject before diving into developing a custom solution.