:enh: performance improvement (avoid recreating the entire KapuaEntit…

…y;ManagerFactory every time)

Signed-off-by: dseurotech <[email protected]>

commons/src/main/java/org/eclipse/kapua/commons/jpa/KapuaJpaTxManagerFactory.java

@@ -23,6 +23,7 @@ public KapuaJpaTxManagerFactory(int maxInsertAttempts) {
     }
 
     public TxManager create(String persistenceUnitName) {
-        return new TxManagerImpl(() -> new JpaTxContext(new KapuaEntityManagerFactory(persistenceUnitName)), maxInsertAttempts);
+        final KapuaEntityManagerFactory entityManagerFactory = new KapuaEntityManagerFactory(persistenceUnitName);
+        return new TxManagerImpl(() -> new JpaTxContext(entityManagerFactory), maxInsertAttempts);
     }
 }