Added configuration examples

grails-app/services/deep/dive/NewsletterSubscriberService.groovy

@@ -1,22 +1,36 @@
 package deep.dive
 
+import grails.config.Config
+import grails.core.GrailsApplication
+import grails.core.support.GrailsConfigurationAware
 import groovy.util.logging.Slf4j
 import org.springframework.beans.factory.annotation.Value
 
 @Slf4j
-class NewsletterSubscriberService {
+class NewsletterSubscriberService { //implements GrailsConfigurationAware {
 
+// Implement setConfiguration when using GrailsConfigurationAware trait
+//    @Override
+//    void setConfiguration(Config co) {
+//        demo = co.getProperty('demo')
+//    }
 
     @Value('${demo}')
     String demo
 
+    //Injecting Grails Application context
+    //GrailsApplication grailsApplication
+
 
     void save(Subscriber subscriber) {
         log.info "Saving subscriber: [${subscriber.email}]"
 
+        //Inject config via grailsApplication.config
+        //grailsApplication.config.getProperty("demo", Integer)
+
         log.info("Value of demo: ${demo}")
 
-        //TODO
+        //TODO: Implement subscriber saving
 
     }