Thực hành EJB (Enterprise Java Bean) Lab 12

Enterprise Application Development in Java EE Lab 12 Concurrency, Listeners and Caching Mục tiêu - Optimistic locking dùng version attribute - Tạo Web Client để test Concurrent truy cập vào Entity Class Phần I Bài tập step by step Bài 8.1 Xây dựng ứng dụng tích điểm thưởng cho khách hàng Step 1: Tạo table Customer Database ConcurrencyDB Step 2: Tạo JDBC ConnectionPool ConcurrencyPool JDBC Resources jdbc/Concurrency IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE Step 3: Tạo ứng dụng Enterprise ConcurrencyApp Step 4: Tạo Entity Class Customer.java từ JDBC Resources jdbc/Concurrency  ConcurrencyApp-ejb  Source Packages  Persistence  Entity Class (Package: entity)  Customer.java IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE package entity; import java.io.Serializable; import javax.persistence.Basic; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery; import javax.persistence.Table; import javax.persistence.Version; import javax.xml.bind.annotation.XmlRootElement; /** * * @author Quang */ @Entity @Table(name = "Customer") @XmlRootElement @NamedQueries({ @NamedQuery(name = "Customer.findAll", query = "SELECT c FROM Customer c"), @NamedQuery(name = "Customer.findById", query = "SELECT c FROM Customer c WHERE c.id = :customerId"), @NamedQuery(name = "customer.findByCustomerName", query = "SELECT c FROM Customer c WHERE c.customerName like :customerName"), @NamedQuery(name = "customer.findByRewardPts", query = "SELECT c FROM Customer c WHERE c.rewardPts = :rewardPts") }) public class Customer implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Basic(optional = false) @Column(name = "CustomerId") private Long id; @Column(name = "CustomerName") private String customerName; @Column(name = "RewardPts") private int rewardPts; @Version private Long vesion; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getCustomerName() { return customerName; } IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE public void setCustomerName(String customerName) { this.customerName = customerName; } public int getRewardPts() { return rewardPts; } public void setRewardPts(int rewardPts) { this.rewardPts = rewardPts; } public Long getVesion() { return vesion; } public void setVesion(Long vesion) { this.vesion = vesion; } @Override public int hashCode() { int hash = 0; hash += (id != null ? id.hashCode() : 0); return hash; } @Override public boolean equals(Object object) { // TODO: Warning - this method won't work in the case the id fields are not set if (!(object instanceof Customer)) { return false; } Customer other = (Customer) object; if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) { return false; } return true; } @Override public String toString() { return "entity.Customer[ id=" + id + " ]"; } } Step 5: Tạo Stateless Session Bean với Local Interface tên RewardPtsModify  ConcurrencyApp-ejb  Source Packages  new  Other  Enterprise JavaBeans  Session Bean IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE  RewardPtsModifyLocal.java package beanpack; IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE import entity.Customer; import javax.ejb.Local; /** * * @author Quang */ @Local public interface RewardPtsModifyLocal { public void multiplyPts(Customer customer, int modifier); public void addPts(Customer customer, int modifier); public void addCustomer(String customerName, int startPoints); public void rapidMultiply(Customer customer, int times) throws Exception; public void rapidAdd(Customer customer, int times) throws Exception; public Customer getCustomer(String customerName); public void resetPoints(Customer customer); public void setLocking(boolean lockingEnable); }  RewardPtsModify.java package beanpack; import entity.Customer; import entity.Customer_; import javax.ejb.Stateless; import javax.ejb.TransactionManagement; import javax.ejb.TransactionManagementType; import javax.persistence.EntityManager; import javax.persistence.LockModeType; import javax.persistence.PersistenceContext; import javax.persistence.TypedQuery; import javax.persistence.criteria.CriteriaBuilder; import javax.persistence.criteria.CriteriaQuery; import javax.persistence.criteria.Predicate; import javax.persistence.criteria.Root; /** * * @author Quang */ @Stateless @TransactionManagement(TransactionManagementType.CONTAINER) public class RewardPtsModify implements RewardPtsModifyLocal { @PersistenceContext(unitName = "ConcurrencyApp-ejbPU") EntityManager em; IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE private boolean lockingEnable; @Override public void multiplyPts(Customer customer, int modifier) { customer.setRewardPts(customer.getRewardPts() * modifier); } @Override public void addPts(Customer customer, int modifier) { customer.setRewardPts(customer.getRewardPts() + modifier); } @Override public void addCustomer(String customerName, int startPoints) { Customer customer = new Customer(); customer.setCustomerName(customerName); customer.setRewardPts(startPoints); em.persist(customer); } @Override public void rapidMultiply(Customer customer, int times) throws Exception { //Get a managable entity reference customer = em.getReference(Customer.class, customer.getId()); //If locking is set as enabled, set an OPTIMISTIC Lock if (lockingEnable) { em.lock(customer, LockModeType.OPTIMISTIC); } //Repeatedely multiply the point with the modifier of for (int i = 0; i < times; i++) { multiplyPts(customer, 2); Thread.sleep(2000); } if (lockingEnable) { em.lock(customer, LockModeType.NONE); } } @Override public void rapidAdd(Customer customer, int times) throws Exception { //Get a managable entity reference customer = em.getReference(Customer.class, customer.getId()); //If locking is set as enabled, set an OPTIMISTIC Lock if (lockingEnable) { em.lock(customer, LockModeType.OPTIMISTIC); } //Repeatedely increment the points with the modifier of for (int i = 0; i < times; i++) { addPts(customer, 1); Thread.sleep(2000); } if (lockingEnable) { em.lock(customer, LockModeType.NONE); } } IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE @Override public Customer getCustomer(String customerName) { Predicate cond = null; CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery cq = cb.createQuery(Customer.class); Root cust = cq.from(Customer.class); cond = cb.like(cust.get(Customer_.customerName), "%" + customerName + "%"); cq.select(cust); cq.where(cond); TypedQuery query = em.createQuery(cq); return query.getResultList().get(0); } @Override public void resetPoints(Customer customer) { customer = em.getReference(Customer.class, customer.getId()); //Reset the points customer.setRewardPts(1); } @Override public void setLocking(boolean lockingEnable) { this.lockingEnable = lockingEnable; } Step 6: Tạo trang jsp ConcurrencyApp-war  ConcurrencyApp-war  New  Other  Web  JSP  CustomerForm.jsp Customer Form Customer Form Customer Name: Reward Points:  CustomerInfo.jsp IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE Customer Search Page Customer Name:  CustomerReward.jsp Customer Search Increment Reward Points Customer Name: Locking Enable: Yes No Add Times: Multiply Times: IT Research Department @BKAP 2015 Page / 20 Enterprise Application Development in Java EE  CustomerReset.jsp Customer Search Customer Search Customer Name: Step 7: Tạo Servlet  ConcurrencyApp-war  Source Paclages  New  Other  Web  Servlet (package servlet)  CustomerInfo.java package servlet; import beanpack.RewardPtsModifyLocal; import entity.Customer; import java.io.IOException; import java.io.PrintWriter; import javax.ejb.EJB; import javax.servlet.ServletException; IT Research Department @BKAP 2015 Page 10 / 20 Enterprise Application Development in Java EE import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author Quang */ public class CustomerInfo extends HttpServlet { @EJB private RewardPtsModifyLocal rewardPtsModify; /** * Processes requests for both HTTP GET and POST * methods * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); String customerName = request.getParameter("customerName"); try (PrintWriter out = response.getWriter()) { /* TODO output your page here You may use following sample code */ out.println(""); out.println(""); out.println(""); out.println("Servlet CustomerInfo"); out.println(""); out.println(""); Customer customer = rewardPtsModify.getCustomer(customerName); out.println("Customer NameReward Points"); out.println("" + customer.getCustomerName() + "" + customer.getRewardPts() + ""); out.println(""); out.println(""); } } // /** * Handles the HTTP GET method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { IT Research Department @BKAP 2015 Page 11 / 20 Enterprise Application Development in Java EE processRequest(request, response); } /** * Handles the HTTP POST method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; } }  CustomerReset.java package servlet; import beanpack.RewardPtsModifyLocal; import entity.Customer; import java.io.IOException; import java.io.PrintWriter; import javax.ejb.EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author Quang */ public class CustomerReset extends HttpServlet { @EJB private RewardPtsModifyLocal rewardPtsModify; /** * Processes requests for both HTTP GET and POST * methods * IT Research Department @BKAP 2015 Page 12 / 20 Enterprise Application Development in Java EE * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); String custName = request.getParameter("customerName"); try (PrintWriter out = response.getWriter()) { /* TODO output your page here You may use following sample code */ out.println(""); out.println(""); out.println(""); out.println("Servlet CustomerReset"); out.println(""); out.println(""); Customer customer = rewardPtsModify.getCustomer(custName); rewardPtsModify.resetPoints(customer); out.println("Customer Points reset!"); out.println(""); out.println(""); } } // /** * Handles the HTTP GET method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP POST method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** IT Research Department @BKAP 2015 Page 13 / 20 Enterprise Application Development in Java EE * Returns a short description of the servlet * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// }  CustomerReward.java package servlet; import beanpack.RewardPtsModifyLocal; import entity.Customer; import java.io.IOException; import java.io.PrintWriter; import java.util.logging.Level; import java.util.logging.Logger; import javax.ejb.EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author Quang */ public class CustomerReward extends HttpServlet { @EJB private RewardPtsModifyLocal rewardPtsModify; /** * Processes requests for both HTTP GET and POST * methods * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); String customerName = request.getParameter("customerName"); boolean lockingEnable = false; String lockStr = request.getParameter("locking"); if (lockStr.equals("Yes")) { lockingEnable = true; } int addTimes = Integer.parseInt(request.getParameter("add")); int multiplyTimes = Integer.parseInt(request.getParameter("multiply")); IT Research Department @BKAP 2015 Page 14 / 20 Enterprise Application Development in Java EE try (PrintWriter out = response.getWriter()) { /* TODO output your page here You may use following sample code */ out.println(""); out.println(""); out.println(""); out.println("Servlet CustomerReward"); out.println(""); out.println(""); Customer customer = rewardPtsModify.getCustomer(customerName); rewardPtsModify.setLocking(lockingEnable); try { rewardPtsModify.rapidAdd(customer, addTimes); rewardPtsModify.rapidMultiply(customer, multiplyTimes); } catch (Exception ex) { Logger.getLogger(CustomerReward.class.getName()).log(Level.SEVERE, null, ex); } out.println("New Customer Details"); customer = rewardPtsModify.getCustomer(customerName); out.println("Customer NameReward Point"); out.println("" + customer.getCustomerName() + "" + customer.getRewardPts() + ""); out.println(""); out.println(""); out.println(""); } } // /** * Handles the HTTP GET method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP POST method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } IT Research Department @BKAP 2015 Page 15 / 20 Enterprise Application Development in Java EE /** * Returns a short description of the servlet * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// }  CustomerServlet.java package servlet; import beanpack.RewardPtsModifyLocal; import java.io.IOException; import java.io.PrintWriter; import javax.ejb.EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author Quang */ public class CustomerServlet extends HttpServlet { @EJB private RewardPtsModifyLocal rewardPtsModify; /** * Processes requests for both HTTP GET and POST * methods * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); String customerName = request.getParameter("customerName"); int rewardPts = Integer.parseInt(request.getParameter("rewardPts")); try (PrintWriter out = response.getWriter()) { /* TODO output your page here You may use following sample code */ out.println(""); out.println(""); out.println(""); out.println("Servlet CustomerServlet"); out.println(""); IT Research Department @BKAP 2015 Page 16 / 20 Enterprise Application Development in Java EE out.println(""); rewardPtsModify.addCustomer(customerName, rewardPts); out.println("Customer Created!"); out.println("Customer Name: "+customerName+""); out.println("Starting points: "+rewardPts); out.println(""); out.println(""); } } // /** * Handles the HTTP GET method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP POST method * * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet * * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// }  Ứng dụng sau hoàn thành IT Research Department @BKAP 2015 Page 17 / 20 Enterprise Application Development in Java EE Step 8: Build and Run Application IT Research Department @BKAP 2015 Page 18 / 20 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page 19 / 20 Enterprise Application Development in Java EE IT Research Department @BKAP 2015 Page 20 / 20 ... CustomerServlet .java package servlet; import beanpack.RewardPtsModifyLocal; import java. io.IOException; import java. io.PrintWriter; import javax .ejb. EJB; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet;... CustomerInfo .java package servlet; import beanpack.RewardPtsModifyLocal; import entity.Customer; import java. io.IOException; import java. io.PrintWriter; import javax .ejb. EJB; import javax.servlet.ServletException;... CustomerReset .java package servlet; import beanpack.RewardPtsModifyLocal; import entity.Customer; import java. io.IOException; import java. io.PrintWriter; import javax .ejb. EJB; import javax.servlet.ServletException;