Modeling applications and Quality of Service (QoS) features is now quite easy using UML and its extensions (profiles). However, to write code ensuring properties such as deadlines remains difficult. For non-critical systems, a simpler approach attempting to supply QoS properties but without guarantee may be satisfactory. In this direction, we propose to build adaptable autonomous systems that modify dynamically their behavior in order to fit their execution context, and to provide services with the expected QoS properties. Such systems have common properties: this paper defines first a generic component based framework, and then gives a general model for the code of adaptable applications. Finally, code generation using Model Driven Architecture (MDA) is outlined.