Call 2 managed bean passed as parameters to the same method of another class

[daniele galassi]

Hi,

I have a class (X) method that accepts as a parameter manaded bean (Y) which calls the class (X) method and makes a call to a service and returns a user.

In another managed bean (Z) I have to do the exact same thing. Is there a way to abstract the parameter of the managed bean (Y) passed to the class (X) method ? In practice I not want to have to create a new method in the class (X) that accepts as a parameter the managed bean (Z)?
thanks

[Tim Holloway]

Welcome to the JavaRanch, Daniele!

Classes don't have parameters. Methods do, but JSF action methods should not, as they get their "parameters" from the backing bean's properties and therefore don't need to have them explicitly passed.

You can certainly create a shared backing bean (session or application-scoped) that can then be injected as a ManagedProperty into other backing beans.

[daniele galassi]

hi Tim,
this is the code:

CertificatoreDB.class
public class CertificatoreBD{
...
public ResponseDTO getLavoratriceByCodiceFiscale(InserimentoCertificatoGravidanza inserimentoCertificatoGravidanza) throws CertificazioniWebException{
try{
//retrieves information of the worker as a function of the tax code
...
}
}

InserimentoCertificatoGravidanza.class
@ManagedBean
@ViewScoped
public class InserimentoCertificatoGravidanza extends Operazione{
...
public String conferma(){
...
ResponseDTO responseDTO = new CertificatoreBD().validazioneCertificatoDiGravidanza(this);
...
}
}

Here i have engineer new managed bean:
InserimentoCertificatoInterruzione.class
@ManagedBean
@ViewScoped
public class InserimentoCertificatoInterruzione extends Operazione{
...
public String conferma(){
...
ResponseDTO responseDTO = new CertificatoreBD().validazioneCertificatoDiInterruzione(???);
...
}
}

[Tim Holloway]

OK. You can make your code samples easier to read if you use our "Code" button on the editor. It preserves your formatting.

You are looking to include an object which requires an argument to construct it. JSF cannot manufacture such objects, although other systems such as the Spring Framework can.

Lacking such a framework, here's one possibility:

/**
 * Object to allow JSF to pass around a DTO.
 */
@ManagedBean
@SessionScoped
public class DtoHolder {

   /**
    * The DTO. Is set from first accessing bean
   */
   private ResponseDTO responseDTO = null; 

   public void setResponseDTO(ResponseDTO dto) {
       this.responseDTO = dto;
  }

  public ResponseDTO getResponseDTO() {
      return this.responseDTO;
  }
}


@ManagedBean
@ViewScoped
public class InserimentoCertificatoGravidanza extends Operazione{

   /**
    * DTO holder which will be constructed for use here and passed to other backing bean
    */
   @ManagedProperty(value="#{dtoHolder}")
   private DtoHolder dtoHolder;

   public void setDtoHolder(DtoHolder dtoHolder) {
      this.dtoHolder = dtoHolder;
   }

...
public String conferma(){
...
  ResponseDTO responseDTO = new CertificatoreBD().validazioneCertificatoDiGravidanza(this);
  this.dtoHolder.setResponseDTO(responseDTO);
...
  }
} 

//=====
/**
 * Bean that uses ResponseDTO constructed by InserimentoCertificatoGravidanza
 */
public class InserimentoCertificatoInterruzione {
@ManagedBean
@ViewScoped
public class InserimentoCertificatoInterruzione extends Operazione{

   /**
    * DTO holder which will be passed after being initialized in other InserimentoCertificatoGravidanza
    */
   @ManagedProperty(value="#{dtoHolder}")
   private DtoHolder dtoHolder;

   public void setDtoHolder(DtoHolder dtoHolder) {
      this.dtoHolder = dtoHolder;
   }
...
public String conferma(){
...
ResponseDTO responseDTO = dtoHolder.getResponseDTO();
...
}
} 

[daniele galassi]

Sorry Tim,
the since in my 2 managed Bean is not

ResponseDTO responseDTO = new CertificatoreBD().validazioneCertificatoDiGravidanza(this);

but:

ResponseDTO responseDTO = new CertificatoreBD().getLavoratriceByCodiceFiscale(this);

It's the same for your good solution?

another thing: if I do not step away from method getLavoratriceByCodiceFiscale of managed bean "InserimentoCertificatogravidanza" what happens?

[Tim Holloway]

The name and function of the method(s) invoked doesn't matter. What I was attempting to illustrate was the structure. You have a shared bean that is initialized from logic in one bean and used by logic in another bean. Because this shared bean is a ManagedBean, JSF will automatically construct it and inject it into the 2 beans that use it as a ManagedProperty.

[daniele galassi]

Tks Tim i understand it