학원 10일차 복습(3/27)

이론

Adapter디자인패턴을 적용한->MouseAdapter의 원리파악하기

        인터페이스의 추상메서드를 필터링해서 제공해주는 기능

        활용도 Dao의 인터페이스와 같은 곳에서 적용할수 있다.

  synchronized :동시화

    withdraw를 호출하는 스레드가 안전하게 lock pool에서

    작업을 끝낼 때 까지 다른 스레드의 간섭을 받지 않는다.

    작업이 끝나면 당연히 다음 스레드가 이일을 같은 방식으로 진행

    public synchronized void withdraw(int money) { - wait(), notify()

    GUI , Network 상에서 스레드들을 사용하게 됨

    WebApplication에서 스레드에 의해서 자원이 관리가 되기 때문에

    싱글톤 패턴으로 동기화가 적용되어진다.

스레드가 사용하는 공유자원을 각 스레드들이 사용할 때 임계영역이 발생하고, 동시성 문제가 발생된다.

서비스 운영 방식 (standalone 과 xinetd) 

standalone 요청받으면 끊어야한다.

xinetd 끊어지면안됨

포트: 서비스번호

OS->IP->서비스(대기)->데몬

TCP/IP:양방향, UDP:단방향, ICMP, 포트,프로토콜,URL

클라이언트 2.요청 

게이트웨이,DNS,TCP/UDP,IP,URL

서버 1.대기(host,port,protocol)

실습

ex1.Ex5_MultiThread

package ex1; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextArea; public class Ex5_MultiThread extends JFrame implements Runnable { //스레드를 구현하는 방법 //run()추상메서드를 재정의하게 된다. 하나의 스레드에게 일을 시키게 프로그래밍을 하도록한다. private JPanel p1, p2; private JButton btn1; private JTextArea res; private JLabel lb; private static boolean inputChk; private static boolean status; public Ex5_MultiThread() { setTitle("단일 스레드!"); p1 = new JPanel(); lb = new JLabel("10초"); //카운트다운에 사용될 라벨.. p1.add(btn1 = new JButton("click")); p1.add(lb); add(p1, "North"); //JFrame에 Panel을 붙이는 메서드 p2 = new JPanel(); res = new JTextArea(20, 50); p2.add(res); add(p2); setBounds(200, 200, 600, 400); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setVisible(true); btn1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { //Thread의 생성자의 인자값으로 Runnable을 구현한 클래스의 주소를 전달한다. new Thread(Ex5_MultiThread.this).start(); new Thread() { @Override public void run() { for (int i = 10; i >= 0; i--) { try { if (inputChk) { lb.setText("Good!"); inputChk = false; i = 10; return; } else { lb.setText(String.valueOf(i) + "초"); } Thread.sleep(1000); } catch (InterruptedException ex) { ex.printStackTrace(); } } status = true; res.append("=====End======\n"); } }.start(); } }); } public static void main(String[] args) { Ex5_MultiThread ref = new Ex5_MultiThread(); } @Override public void run() { String input = JOptionPane.showInputDialog("값을 입력"); if (!status) { res.append("입력한 값" + input + "\n"); inputChk = true; }else{ res.append("값을 입력 못함\n"); } } }

ex1.CanvasDemo

package ex1; import java.awt.Canvas; import java.awt.Color; import java.awt.Graphics; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import javax.swing.JFrame; public class CanvasDemo extends JFrame implements MouseMotionListener { private int x, y; public CanvasDemo() { x = 10; y = 10; Canvas can = new Canvas() { //오버라이딩을 해서 캔버스에서 하고 있던 일을 재정의해서 사용! @Override public void update(Graphics g) { paint(g); } @Override public void paint(Graphics g) { g.setColor(Color.red); g.fillOval(x, y, 50, 50); } }; add(can); //Adapter디자인패턴을 적용한->MouseAdapter의 원리파악하기 //인터페이스의 추상메서드를 필터링해서 제공해주는 기능 //활용도 Dao의 인터페이스와 같은 곳에서 적용할수 있다. can.addMouseMotionListener(new MouseAdapter() { @Override public void mouseDragged(MouseEvent e) { x =e.getX(); y =e.getY(); System.out.println(x+":"+y); can.repaint(); //repaint() -> JVM -> update()호출[캔버스의 화면을 삭제]->paint()호출[그림을 그리는 메서드] } }); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 500, 500); setVisible(true); } public static void main(String[] args) { new CanvasDemo(); } @Override public void mouseDragged(MouseEvent e) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } @Override public void mouseMoved(MouseEvent e) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } }

ex1.Ex3_canvas1

package ex1; import java.awt.Canvas; import java.awt.Color; import java.awt.Graphics; import javax.swing.JFrame; public class Ex3_Canvas1 extends JFrame { private Canvas can; private int arcNum; private int x = 100; public int getX() { return x; } public void setX(int x) { this.x = x; } public Canvas getCan() { return can; } public int getArcNum() { return arcNum; } public void setArcNum(int arcNum) { this.arcNum = arcNum; } public Ex3_Canvas1() throws InterruptedException { add(can = new Canvas() { @Override public void paint(Graphics g) { g.setColor(Color.red); g.drawArc(x, 100, 100, 100, 0, arcNum); } @Override public void update(Graphics g) { paint(g); } }); can.setBackground(Color.white); setBounds(100, 100, 800, 500); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //MyThread가 해야할 작업이 현재 클래스의 캔버스를 그리는 일이기 때문에 //this로 현재객체의 주소값을 전달함 setVisible(true); System.out.println("Test"); Thread t1 = new Thread(new MyThread0(this)); Thread t2 = new Thread(new MyThread0(this)); Thread t3 = new Thread(new MyThread0(this)); t1.start(); t1.join(); t2.start(); t2.join(); t3.start(); } public static void main(String[] args) throws InterruptedException { new Ex3_Canvas1(); } }

ex1.MyThread0

package ex1; public class MyThread0 implements Runnable { private Ex3_Canvas1 myCan; //생성자 호출시 캔버스를 가지고 있는 객체의 주소값을 초기화 public MyThread0(Ex3_Canvas1 myCan) { this.myCan = myCan; } @Override public void run() { //여기에서 스레드 핸들링 작업(원을 그리기 위한..) int temN; while (myCan.getArcNum() <= 360) { try { Thread.sleep(500); } catch (InterruptedException ex) { ex.printStackTrace(); } temN = myCan.getArcNum(); temN = temN + 30; myCan.setArcNum(temN); myCan.getCan().repaint();//스레드에게 캔버스의 그림을 그리도록 repaint를 호출한다. } int x = myCan.getX(); x += 100; myCan.setX(x); temN =0; myCan.setArcNum(temN); } }

ex2.Account

package ex2; import java.util.logging.Level; import java.util.logging.Logger; public class Account { private int balance; // synchronized :동시화 //withdraw를 호출하는 스레드가 안전하게 lock pool에서 //작업을 끝낼 때 까지 다른 스레드의 간섭을 받지 않는다. //작업이 끝나면 당연히 다음 스레드가 이일을 같은 방식으로 진행 //public synchronized void withdraw(int money) { - wait(), notify() //GUI , Network 상에서 스레드들을 사용하게 됨 //WebApplication에서 스레드에 의해서 자원이 관리가 되기 때문에 //싱글톤 패턴으로 동기화가 적용되어진다. public synchronized void withdraw(int money){ // synchronized(this){ //동기화 블록 if(balance>=money){ try { Thread.sleep(1000); } catch (InterruptedException ex) { ex.printStackTrace(); } balance -=money; } // } } public int getBalance() { return balance; } public void setBalance(int balance) { this.balance = balance; } }

ex2.Bank

package ex2; // 스레드가 사용하는 공유자원을 각 스레드들이 사용할 때 import javax.swing.JOptionPane; //임계영역이 발생하고, 동시성 문제가 발생된다. public class Bank extends javax.swing.JFrame implements Runnable{ private Account acc; public Bank() { acc = new Account(); initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); balance = new javax.swing.JTextField(); jButton1 = new javax.swing.JButton(); showMoney = new javax.swing.JLabel(); jScrollPane1 = new javax.swing.JScrollPane(); jTextArea1 = new javax.swing.JTextArea(); jButton2 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jPanel1.setBackground(new java.awt.Color(255, 204, 102)); jLabel1.setText("예치 금액:"); jButton1.setText("적용"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); showMoney.setText("금액 : 000000"); jTextArea1.setColumns(20); jTextArea1.setRows(5); jScrollPane1.setViewportView(jTextArea1); jButton2.setText("인출Start"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(157, 157, 157) .addComponent(showMoney, javax.swing.GroupLayout.PREFERRED_SIZE, 126, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(82, 82, 82) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 620, javax.swing.GroupLayout.PREFERRED_SIZE) .addGroup(jPanel1Layout.createSequentialGroup() .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 88, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(balance, javax.swing.GroupLayout.PREFERRED_SIZE, 261, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(77, 77, 77) .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE))))) .addContainerGap(78, Short.MAX_VALUE)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup() .addGap(0, 0, Short.MAX_VALUE) .addComponent(jButton2) .addGap(92, 92, 92)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addGap(62, 62, 62) .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 34, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(balance, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jButton1)) .addGap(55, 55, 55) .addComponent(showMoney, javax.swing.GroupLayout.PREFERRED_SIZE, 26, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 231, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(18, 18, 18) .addComponent(jButton2) .addContainerGap(36, Short.MAX_VALUE)) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { //입력한 예치금액을 Account객체로 주입 try{ acc.setBalance(Integer.parseInt(balance.getText().trim())); showMoney.setText("금액:"+balance.getText().trim()); }catch(NumberFormatException e){ JOptionPane.showMessageDialog(Bank.this,"정수만 입력하세요."); balance.setText(""); balance.requestFocus(); } } //인출버튼 클릭 private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { jTextArea1.setText(""); Thread t1 = new Thread(Bank.this,"Mom"); Thread t2 = new Thread(Bank.this,"Son"); t1.start(); t2.start(); } /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(Bank.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(Bank.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(Bank.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(Bank.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new Bank().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JTextField balance; private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JLabel jLabel1; private javax.swing.JPanel jPanel1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextArea jTextArea1; private javax.swing.JLabel showMoney; // End of variables declaration //다중스레드가 수행할 작업을 정의 @Override public void run() { while(acc.getBalance() >0){ //메서드가 호출될 때 임의의 수를 선택해서 출금 시킴 //100,200,300 int money = (int)(Math.random()*3 +1)*100; acc.withdraw(money); //스레드 동시성이 일어남! showMoney.setText("금액:"+String.valueOf(acc.getBalance())); System.out.println("Current Thread"+Thread.currentThread().getName()+":"+acc.getBalance()); jTextArea1.append("인출정보 :"+Thread.currentThread().getName()+":"+acc.getBalance()+"\n"); } } }

ex3.MyCar

package ex3; import java.util.ArrayList; import java.util.List; public class MyCar { //생산될 자동차를 저장할 공간 private List<String> carList; public MyCar() { carList = new ArrayList<>(); } //자동차의 이름을 선택(랜덤하게) public String getCar() { String carName = ""; switch ((int) (Math.random() * 3)) { case 0: carName = "그랜저1"; break; case 1: carName = "그랜저2"; break; case 2: carName = "그랜저3"; break; } return carName; } //소비자 패턴! public synchronized String pop(Thread t) { String carName = ""; if (carList.size() == 0) { try { System.out.println("생산된 자동차가 없습니다. VIP룸에서 기다려주세요."); wait(); } catch (InterruptedException ex) { } } carName = carList.remove(carList.size() - 1); System.out.println("손님이 차를 구입했습니다."); System.out.println("구입한 차이름은 :" + carName + ":" + t.getName()); return carName; } //생산자 패턴 public synchronized void push(String car, Thread t) { carList.add(car); System.out.println("자동차가 만들어 졌습니다."); if (carList.size() == 5) { notify(); } } }

ex3.Producer

package ex3; public class Producer implements Runnable { private MyCar car; public Producer(MyCar car) { this.car = car; } @Override public void run() { String carName = null; for (int i = 0; i < 20; i++) { carName = car.getCar(); Thread t = Thread.currentThread(); car.push(carName, t); try { Thread.sleep((int) (Math.random() * 200)); } catch (InterruptedException ex) { ex.printStackTrace(); } } } }

ex3.Customer

package ex3; public class Customer implements Runnable{ private MyCar car; public Customer(MyCar car) { this.car = car; } @Override public void run() { String carName = null; for (int i = 0; i < 20; i++) { carName = car.pop(Thread.currentThread()); try { Thread.sleep((int) (Math.random() * 200)); } catch (InterruptedException ex) { ex.printStackTrace(); } } } }

ex3.ProducerMain

package ex3; public class ProducerMain { public static void main(String[] args) { MyCar c = new MyCar(); Producer producer = new Producer(c); Thread tPThread = new Thread(producer); Customer customer = new Customer(c); Thread cCThread = new Thread(customer); tPThread.start(); cCThread.start(); } }