Aragon DBE Community

We have deveoped OPAALS TOOLS, a set of tools developed in the OPAALs NeO project in order to validate the research done in the Applied methodologies for dynamic service composition task.

XLS2XML The tool has been created for the generation of XML documents and contract-in a more friendly. Does not exist in the market for a publisher of e-contract. This tool will also generate these documents, also validates its syntactic structure. In addition, documentation generated by the semantics of e-contract, and finally creates a base document that serves the Finder tool to generate the search forms.

The tool handles Finder search within each of the utilities, the contracts of providers of services, companies that come closest to our needs. The end user is, who sought in each of the services offered which include a charge of their own to the results of the search. The results shown from the parameters entered by the user are presented with a success rate. This ratio shows the coincidence with the data entered into the contracts offered by the companies served.

The project

OPAALS (Open Philosophies for Associative Autopoietic Digital Ecosystems) is a multi-disciplinary network of research excellence for developing the science and technology behind Digital Ecosystems.

Digital Ecosystems represent the next generation of Internet usage. Applicable to many fields, they will perhaps have the greatest effect in enabling Small and Medium-sized Enterprises (SMEs) to compete on the global stage. Based on open and low-cost peer-to-peer architectures, Digital Ecosystems represent the future of technical, social, and economic aspects of the connected world.Our Task

The Aragón Institute of Technology (ITA) is specialised in consultancy studies and product development (i.e. software engineering) for SMEs and companies in the Aragón region. The Advanced Laboratory for Legal and Business Applications in the Information Society from the University of Zaragoza (UniZar) represents the second main partner in this task. The task aims at describing contracts at a semantic level for dynamic service composition in the field of business negotiation and contractual automatisation processes in the DEs. Additionally, the task includes studies regarding negotiation processes between companies in a specific sector, the contractual relationships that the companies agree on, and the modes how they resolve their disputes. These conflicts may be solved through contractual mechanisms or through “not written” mechanisms, which are normally used in that specific sector. From an academic point of view, this research raises an interesting question, namely, to review the “custom” concept as a source of law in a background such as the DEs. Another interesting question is related to the business processes and the agreements reached by the companies in a specific sector, which is the need for a new culture of “collaborative competition” and its proper legal treatment. This issue is related to the interoperability concept, since any kind of cooperation between companies in the development of an activity, which is essential in our framework, has an impact on market competition, but has not yet a correct treatment by Law.

Reference: http://opaalstools.sourceforge.net/

Este tutorial muestra paso a paso cómo desarrollar un servicio que consume un web-service y desplegarlo en el servENT v0.3.15.

Desde el ITA queremos agradecer la colaboración ofrecida por Techideas en la elaboración de este ejemplo

Aspectos preliminares:

• Debes tener Java 1.5
• Debes tener el servent 0.3.15 ya instalado (puedes leer el tutorial asociado)
• No puedes usar el DBEStudio
• Puedes descargar todo el código fuente asociado desde nuestro CVS aquí
• No puedes usar versiones recientes de AXIS ni otras librerías externas que no sean compatibles con las librerías que ya incluye el propio servENT en la carpeta common. Por este motivo, usaremos AXIS 1.2 para generar el adaptador
• Debes tener el Web-service disponible mediante su descriptor WSDL

Generar el cliente con AXIS:

• En primer lugar debemos tener acceso al WDSL del servicio. En nuestro caso, vamos a utilizar como ejemplo el servicio globalweather.  Copiaremos el fichero wdsl a nuestra carpeta
  
• Seguidamente usaremos axis1.2 para generar el cliente, mediante el WSDL2JAVA, como sigue

java -classpath c://dbe_0_3_15//servent//common//axis-1.2.1.jar;:c://dbe_0_3_15//servent//common//log4j.jar;c://dbe_0_3_15//servent//common//commons-logging-1.0.3.jar;c://dbe_0_3_15//servent//common//commons-discovery-0.2.jar;c://dbe_0_3_15//servent//common//axis-jaxrpc-1.2.jar;c://dbe_0_3_15//servent//common//axis-wsdl4j-1.2-RC2.jar;c://dbe_0_3_15//servent//common//axis-saaj-1.2.1.jar org.apache.axis.wsdl.WSDL2Java globalweather.wsdl

• Nos creará una carpeta NET con las clases, que moveremos a la carpeta src como código fuente del servicio
• Seguidamente debemos crear la interfaz que nuestro servicio va a ofrecer, que en nuestro caso es un proxy del servicio de globalweather

public interface IITAGlobalWeather {

    public String getWeather(String city, String country)
            throws java.rmi.RemoteException;

}

• A continuación debemos desarrollar el propio servicio:

public class ITAGlobalWeatherAdapter implements IITAGlobalWeather, Adapter {

private ServiceContext serviceContext;

private static final QName SERVICE_NAME = new QName(
“http://www.webserviceX.NET”, “GlobalWeather”);

public void destroy() {
System.out
.println(new Date() + ” :: ITAGlobalWeatherAdapter.destroy()”);
}

public void init(ServiceContext arg0) {
System.out.println(new Date() + ” :: ITAGlobalWeatherAdapter.init()”);
this.serviceContext = arg0;
}

public String getWeather(String city, String country)
throws RemoteException {
try {
System.out.println(new Date()
+ ” :: ITAGlobalWeatherAdapter.getWeather city ” + city
+ ” country ” + country);
String wsdlfilename = “globalweather.wsdl”;

URL wsdlURL = new File(serviceContext.getHome(), wsdlfilename)
.toURL();

ServiceFactory serviceFactory = null;
serviceFactory = (ServiceFactory) ServiceFactory.newInstance();
Service afs = (Service) serviceFactory.createService(wsdlURL,
SERVICE_NAME);
GlobalWeatherSoap port = (GlobalWeatherSoap) afs
.getPort(GlobalWeatherSoap.class);

System.out
.println(new Date()
+ ” :: ITAGlobalWeatherAdapter.getWeather Invoking getWeather…”);
String weather = port.getWeather(city, country);
System.out.println(new Date()
+ ” :: ITAGlobalWeatherAdapter.getWeather result ”
+ weather);
return weather;
} catch (Exception ex) {
ex.printStackTrace();
return (ex.getMessage());
} catch (Throwable t) {
if (t instanceof Error) {
Error err = (Error) t;
} else if (t instanceof Exception) {
Exception ex = (Exception) t;
}
System.out.println(t);
throw new RemoteException(t.getCause().toString(), t);
}

}
}

• Seguidamente debemos generar el fichero para desplegar el servicio dentro del servENT:

 
    ITAGlobalWeather
    ITAGlobalWeatherSMID
    Global Weather by ITA
    org.dbe.ita.demos.globalweather.ITAGlobalWeatherAdapter