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ES2(40) Què són els Session Contexts?
Uns dels objectes importants dels Enterprise Java Beans (i que a l'assignatura no tenim gaire temps per explicar-los) són els anomenats EJB Context Objects. En particular, hi ha els EJB Session Context Objects. Us proposo que respongueu el següent:
  1. Què són els EJB Session Context Objects?.
  2. Com estan definits? (atributs, operacions).
  3. Qui els defineix?.
  4. Qui els usa?. Per a què?. S'han d'usar sempre?.
  5. Expliqueu un exemple concret (i raonable) d'ús d'aquests objectes en un cas particular.

Comments:
El objeto SessionContext es el encargado de interactuar con el contenedor de EJB. A través de él se puede acceder a información acerca de si el cliente tiene permisos de ejecución o sobre el
estado transaccional.

El context object contiene:
– Información relacionada con la seguridad
• getCallerPrinciple, isCallerInRole
– Información y métodos relacionados con las transacciones
• getUserTransaction, get/setRollbackOnly
– Información del objeto que implementa la interfaz home
• getEJBHome, getEJBLocalHome
– Información del objeto que implementa la interfaz de componente EJB Object
• getEJBObject, getEJBLocalObject


Los EJBs contienen los siguientes métodos y atributos para el manejo del contexto de la sesión:
– Atributo SessionContext
– Método setSessionContext que sirve para que la
instancia del bean se guarde el contexto
– Método getSessionContext

La operación setSessionContext es llamada por el contenedor después de la creación del EJB y recibe del contenedor la información del contexto. Esta información debe ser almacenada como dato miembro del EJB y a través de ella podemos acceder a información del contenedor.
 
El EJBSessionContextObject es quien actua con el contenedor de EJB.
El EJBSEssionContext tiene el atributo SessionContext y los dos métodos setSessionContext y getSessionContext.
El SJBSessionContext es creado por el contenedor.
 
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