Teaching Management System-Session Bean

Collegeservice is a remote interface. Most remote interfaces have similar operations to add, delete, modify, and query. Therefore, a parent interface iservice is defined. To reduce unnecessary type conversions, use generics when defining iservice. When collegeservice is derived from iserive, it is bound to define the college.

Collegeservicebean is a stateless Session Bean identified by @ stateless. It implements the collegeservice interface and derives from abstractserviebean. Abstractbean provides the default implementation for adding, deleting, modifying, and querying operations.

Iservice_college and abstractservicebean_college in the figure indicate the binding to the generic type. They do not have Code and are embodied when the child type is derived.

package org.bnuitse.tms.service.security;

import java.util.List;

import org.bnuitse.tms.model.security.College;
import org.bnuitse.tms.service.IService;

public interface CollegeService extends IService<College>{
 String jndiName = "tms/security/CollegeService";
 College find(String name);
}

package org.bnuitse.tms.service.security.impl;

import java.util.List;

import javax.ejb.Remote;
import javax.ejb.Stateless;

import org.bnuitse.tms.model.security.College;
import org.bnuitse.tms.service.AbstractServiceBean;
import org.bnuitse.tms.service.security.CollegeService;
import org.jboss.annotation.ejb.RemoteBinding;

@Stateless
@Remote(CollegeService.class)
@RemoteBinding(jndiBinding = CollegeService.jndiName)
public class CollegeServiceBean extends AbstractServiceBean<College> implements CollegeService {
 public College find(String name) {
  return (College) em.createQuery("from College o where o.name = :name").setParameter("name", name).getSingleResult();
 }
}