NEW: method ebean_recalc notifies the bean to perform additional computations

src/main/java/io/ebean/bean/EntityBean.java

@@ -96,4 +96,9 @@ public interface EntityBean extends Serializable {
    */
   Object _ebean_getFieldIntercept(int fieldIndex);
 
+  /**
+   * Recalcs the bean. This is invoked by PersistRequestBean.
+   */
+  default void _ebean_recalc() {};
+
 }

src/main/java/io/ebeaninternal/server/core/PersistRequestBean.java

@@ -156,6 +156,7 @@ public final class PersistRequestBean<T> extends PersistRequest implements BeanP
 
     super(server, t, persistExecute);
     this.entityBean = (EntityBean) bean;
+    this.entityBean._ebean_recalc();
     this.intercept = entityBean._ebean_getIntercept();
     this.beanManager = mgr;
     this.beanDescriptor = mgr.getBeanDescriptor();