René Santaolaya Salgado

Using case-based reasoning for improving precision and recall in web services selection

Web services are currently one of the main technologies employed to create a systematic and extensible framework for application development. However, due to the large number of web services that exist nowadays, locating one or several web services to fulfil the functional requirements of a user or an organisation, is a complex and time consuming activity for application developers, also reducing their productivity. One possible solution for this problem is the implementation of a semantic component, structured as a library and populated with cases which represent web services in such a way that it may extend the functionality of the existing web services directories. This paper describes a model for searching and selecting web services supported by Case-Based Reasoning (CBR). Results showed that the extension to Universal Description, Discovery and Integration (UDDI) yielded 100% recall while precision improved significantly, depending some times on the way the user queried the system.

An Object-Oriented Metric to Measure the Degree of Dependency Due to Unused Interfaces

Object-Oriented frameworks are sets of classes designed to work together in order to offer generic solutions to many specific problems within the same application domain. A situation that often arises from the design of a framework is the interface dependency problem produced by interface inheritance when subclasses do not really need the interfaces. This problem negatively affects frameworks in their reuse and extension qualities. Although we know that this problem exists, we do not have a way to measure to what extent this problem affects frameworks. In this paper an object-oriented metric to measure the degree of dependency due to unused interfaces is proposed. Case studies are presented in order to show how this metric helps to detect when frameworks have a serious interface dependency problem. With this information a quantitative decision can be made to take care of the problem.

Modelo formal para la reestructura de marcos orientados a objetos hacia arquitecturas modelo-vista-adaptador

La reestructura de codigo legado puede realizarse con fines diferentes, entre los que se encuentran la migracion hacia nuevas tecnologias que faciliten el mantenimiento y la reutilizacion del codigo. Los marcos orientados a objetos ( frameworks ) cuentan con caracteristicas que, de cierta manera, limitan el reuso de su codigo. En este trabajo se propone un modelo formal que describe un proceso de reestructura de codigo legado de marcos orientados a objetos (MOO) hacia codigo conforme a la arquitectura modelo-vista-adaptador (MVA). Este proceso se lleva a cabo aplicando 11 metodos de reestructura, con el objetivo de separar el codigo de la logica del negocio (el modelo), la cual es la parte mas reusable del marco, del codigo que implementa la vista y del codigo que controla el procesamiento especifico de la aplicacion. Como resultado, el codigo legado del marco queda preparado para una migracion posterior hacia servicios web.

Frameworks as Web Services

Object oriented frameworks represent one of the most important current approaches in component based software development for achieving high level software reuse. Frameworks for different domains others than those provided by well known development platforms are generally developed within an organization and the people who use them belong to the same organization, although their reuse scope may be widened by making them accessible to other users. One possible approach for doing this is to establish frameworks as web services. However, converting a framework to web services is possible only if the framework needs not to be extended by inheritance or aggregation, and by declaring its interfaces. This paper describes how frameworks may be established as web services and what limitations are faced when the advantages of framework based development such as customizing a framework want to be taken. An example using a framework for the statistical domain is shown.