fix: getState now mandatory on EventProvider (#531)

* fix: getState mandatory on EventProvider

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

* fixup: update test class

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

* Update src/test/java/dev/openfeature/sdk/EventProviderTest.java

Co-authored-by: Giovanni Liva <giovanni.liva@dynatrace.com>
Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

---------

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>
Co-authored-by: Giovanni Liva <giovanni.liva@dynatrace.com>

src/main/java/dev/openfeature/sdk/EventProvider.java

@@ -16,6 +16,12 @@ import dev.openfeature.sdk.internal.TriConsumer;
  */
 public abstract class EventProvider implements FeatureProvider {
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public abstract ProviderState getState();
+
     private TriConsumer<EventProvider, ProviderEvent, ProviderEventDetails> onEmit = null;
 
     /**

src/main/java/dev/openfeature/sdk/FeatureProvider.java

@@ -31,7 +31,7 @@ public interface FeatureProvider {
      * if they have special initialization needed prior being called for flag
      * evaluation.
      * <p>
-     * It is ok, if the method is expensive as it is executed in the background. All
+     * It is ok if the method is expensive as it is executed in the background. All
      * runtime exceptions will be
      * caught and logged.
      * </p>
@@ -46,7 +46,7 @@ public interface FeatureProvider {
      * Providers can overwrite this method, if they have special shutdown actions
      * needed.
      * <p>
-     * It is ok, if the method is expensive as it is executed in the background. All
+     * It is ok if the method is expensive as it is executed in the background. All
      * runtime exceptions will be
      * caught and logged.
      * </p>
@@ -57,7 +57,11 @@ public interface FeatureProvider {
 
     /**
      * Returns a representation of the current readiness of the provider.
-     * Providers which do not implement this method are assumed to be ready immediately.
+     * If the provider needs to be initialized, it should return {@link ProviderState#NOT_READY}.
+     * If the provider is in an error state, it should return {@link ProviderState#ERROR}.
+     * If the provider is functioning normally, it should return {@link ProviderState#READY}.
+     * 
+     * <p><i>Providers which do not implement this method are assumed to be ready immediately.</i></p>
      * 
      * @return ProviderState
      */

src/test/java/dev/openfeature/sdk/EventProviderTest.java

@@ -121,6 +121,11 @@ class EventProviderTest {
             // TODO Auto-generated method stub
             throw new UnsupportedOperationException("Unimplemented method 'getObjectEvaluation'");
         }
+
+        @Override
+        public ProviderState getState() {
+            return ProviderState.READY;
+        }
     }
 
     @SuppressWarnings("unchecked")