feat: external resource with generated id support

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/AbstractEventSource.java

@@ -6,6 +6,7 @@
 public abstract class AbstractEventSource implements EventSource {
   private EventHandler handler;
   private volatile boolean running = false;
+  private EventSourceStartPriority eventSourceStartPriority;
 
   protected EventHandler getEventHandler() {
     return handler;
@@ -29,4 +30,14 @@ public void start() throws OperatorException {
   public void stop() throws OperatorException {
     running = false;
   }
+
+  @Override
+  public EventSourceStartPriority priority() {
+    return eventSourceStartPriority;
+  }
+
+  public AbstractEventSource setEventSourcePriority(EventSourceStartPriority eventSourceStartPriority) {
+    this.eventSourceStartPriority = eventSourceStartPriority;
+    return this;
+  }
 }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/EventSource.java

@@ -20,5 +20,7 @@ public interface EventSource extends LifecycleAware {
    */
   void setEventHandler(EventHandler handler);
 
-
+  default EventSourceStartPriority priority() {
+    return EventSourceStartPriority.DEFAULT;
+  }
 }

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/EventSourceStartPriority.java

@@ -0,0 +1,9 @@
+package io.javaoperatorsdk.operator.processing.event.source;
+
+public enum EventSourceStartPriority {
+
+    RESOURCE_STATE_LOADER,
+    DEFAULT
+
+
+}