first version of pattern without Tests

extension-objects/src/main/java/abstractextensions/CommanderExtension.java

@@ -0,0 +1,7 @@
+package abstractextensions;
+
+/**
+ * Created by Srdjan on 27-Apr-17.
+ */
+public interface CommanderExtension extends UnitExtension {
+}

extension-objects/src/main/java/abstractextensions/SergeantExtension.java

@@ -0,0 +1,9 @@
+package abstractextensions;
+
+/**
+ * Created by Srdjan on 27-Apr-17.
+ */
+public interface SergeantExtension extends UnitExtension {
+
+  void sergeantReady();
+}

extension-objects/src/main/java/abstractextensions/SoldierExtension.java

@@ -0,0 +1,8 @@
+package abstractextensions;
+
+/**
+ * Created by Srdjan on 26-Apr-17.
+ */
+public interface SoldierExtension extends UnitExtension {
+  void soldierReady();
+}

extension-objects/src/main/java/abstractextensions/UnitExtension.java

@@ -0,0 +1,7 @@
+package abstractextensions;
+
+/**
+ * Created by Srdjan on 26-Apr-17.
+ */
+public interface UnitExtension {
+}