handle NodeChildrenChanged event

autohealer/src/main/java/Autohealer.java

@@ -26,6 +26,7 @@ import org.apache.zookeeper.*;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.List;
 
 public class Autohealer implements Watcher {
 
@@ -81,9 +82,13 @@ public class Autohealer implements Watcher {
                     }
                 }
                 break;
-            /**
-             * Add states code here to respond to the relevant events
-             */
+            case NodeChildrenChanged:
+                // This event is triggered when workers are added or removed
+                if (event.getPath() != null && event.getPath().equals(AUTOHEALER_ZNODES_PATH)) {
+                    System.out.println("Detected change in workers. Re-evaluating if new workers are needed...");
+                    launchWorkersIfNecessary();
+                }
+                break;
         }
     }