Source Code : Stateful Session Bean And Shopping Cart

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Stateful Session Bean And Shopping Cart

File: EmployeeBean.java



import java.util.HashMap;
import java.util.Map;

import javax.ejb.Remove;
import javax.ejb.Stateful;


@Stateful
public class EmployeeBean implements EmployeeServiceLocal, EmployeeServiceRemote {


  public EmployeeBean() {
  }

  private HashMap<String,Integer> items = new HashMap<String,Integer>();

  public void addItem(String item, int quantity) {
      Integer orderQuantity = items.get(item);
      if (orderQuantity == null) {
          orderQuantity = 0;
      }
      orderQuantity += quantity;
      items.put(item, orderQuantity);
  }

  public void removeItem(String item, int quantity) {
      Integer orderQuantity = items.get(item);
      if (orderQuantity == null) {
          return;
      }
      orderQuantity -= quantity;
      if (orderQuantity > 0) {
          items.put(item, orderQuantity);         
      } else {
          items.remove(item);
      }
  }
  
  public Map<String, Integer> getItems() {
      return items;
  }

  @Remove
  public void checkout(int paymentId) {
    System.out.println("checkout");
  }

  @Remove
  public void cancel() {
  }


}


File: EmployeeServiceLocal.java

import java.util.Map;

import javax.ejb.Local;


@Local
public interface EmployeeServiceLocal {
  public void addItem(String id, int quantity);
  public void removeItem(String id, int quantity);
  public Map<String, Integer> getItems();
  public void checkout(int paymentId);
  public void cancel();
}



File: EmployeeServiceRemote.java




import java.util.Map;

import javax.ejb.Remote;


@Remote
public interface EmployeeServiceRemote {
  public void addItem(String id, int quantity);
  public void removeItem(String id, int quantity);
  public Map<String, Integer> getItems();
  public void checkout(int paymentId);
  public void cancel();
}


File: Employee.java


import javax.persistence.Entity;
import javax.persistence.EntityListeners;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.PostRemove;



@Entity

public class Employee implements java.io.Serializable {
  private int id;

  private String firstName;

  private String lastName;

  @Id
  @GeneratedValue
  public int getId() {
    return id;
  }


  @PostRemove
  public void postRemove()
  {
     System.out.println("@PostRemove");
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String first) {
    this.firstName = first;
  }

  public String getLastName() {
    return lastName;
  }

  public void setLastName(String last) {
    this.lastName = last;
  }
}


File: jndi.properties

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099


File: Main.java

import javax.ejb.EJB;
import javax.naming.InitialContext;

public class Main {
  
  public static void main(String[] a) throws Exception {

    EmployeeServiceRemote service = null;

    // Context compEnv = (Context) new InitialContext().lookup("java:comp/env");

    // service = (HelloService)new InitialContext().lookup("java:comp/env/ejb/HelloService");
    service = (EmployeeServiceRemote) new InitialContext().lookup("EmployeeBean/remote");

    service.addItem("item", 10);
    service.removeItem("item", 1);
    service.checkout(10);
    //service.cancel();

  }

}




           
       

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