Single Thread Execution设计模式

public class Test {
    public static void main(String[] args){
//        FlightSercurityTest.test();
//        EatNoodleThread.test();
        EatNoodleThread1.test();
    }
}

/*
    16.1.1 非线程安全
 */
class FlightSecurity{
    private int count = 0;
    private String boardingPass = "null";
    private String idCard = "null";

    public synchronized void pass(String boardingPass, String idCard) {
        this.boardingPass = boardingPass;
        this.idCard = idCard;
        this.count++;
        check();
    }

    private void check(){
        if (boardingPass.charAt(0) != idCard.charAt(0)) {
            throw new RuntimeException("---Exception---"+toString());
        }
    }

    @Override
    public String toString() {
        return "FlightSecurity{" +
                "count=" + count +
                ", boardingPass='" + boardingPass + '\'' +
                ", idCard='" + idCard + '\'' +
                '}';
    }
}

class FlightSercurityTest{
    static class Passenagers extends Thread{
        private final FlightSecurity flightSecurity;
        private final String isCard;
        private final String boardingPass;

        public Passenagers(FlightSecurity flightSecurity, String isCard, String boardingPass) {
            this.flightSecurity = flightSecurity;
            this.isCard = isCard;
            this.boardingPass = boardingPass;
        }

        public void run(){
            while (true){
                flightSecurity.pass(boardingPass,isCard);
            }
        }
    }

    public static void test(){
        final FlightSecurity f= new FlightSecurity();
        new Passenagers(f,"A","A").start();
        new Passenagers(f,"B","B").start();
        new Passenagers(f,"C","C").start();
    }
}

/*
    16.3 吃面问题
 */
class Tableware{
    private final String toolName;

    public Tableware(String toolName) {
        this.toolName = toolName;
    }

    @Override
    public String toString() {
        return "Tableware: "+toolName;
    }
}

class TablewarePair{
    private final Tableware left;
    private final Tableware right;

    public TablewarePair(Tableware left, Tableware right) {
        this.left = left;
        this.right = right;
    }

    public Tableware getLeft(){
        return left;
    }

    public Tableware getRight(){
        return right;
    }
}

class EatNoodleThread extends Thread{
    private final String name;

    private final Tableware left;
    private final Tableware right;

    public EatNoodleThread(String name, Tableware left, Tableware right) {
        this.name = name;
        this.left = left;
        this.right = right;
    }

    public void run(){
        while(true){
            this.eat();
        }
    }

    private void eat(){
        synchronized (left){
            synchronized (right){
                System.out.println(name+" take up "+left+"(left)");
                synchronized (right){
                    System.out.println(name+" take up "+right+"(right)");
                    System.out.println(name+" is eating now.");
                    System.out.println(name+" put down "+right+"(right)");
                }
                System.out.println(name+" put down "+left+"(left)");
            }

        }
    }

    public static void test(){
        Tableware fork = new Tableware("fork");
        Tableware knife = new Tableware("knife");
        new EatNoodleThread("Big",fork,knife).start();
        new EatNoodleThread("Little",knife,fork).start();
    }
}

class EatNoodleThread1 extends Thread{
    private final String name;
    private final TablewarePair pair;

    public EatNoodleThread1(String name, TablewarePair pair) {
        this.name = name;
        this.pair = pair;
    }

    public void run() {
        while (true) {
            this.eat();
        }
    }

    private void eat(){
        synchronized (pair){
            System.out.println(name+" take up "+pair.getLeft()+"(left)");
            System.out.println(name+" put down "+pair.getRight()+"(right)");
            System.out.println(name+" is eating now.");
            System.out.println(name+" take up "+pair.getLeft()+"(right)");
            System.out.println(name+" put down "+pair.getLeft()+"(left)");
        }
    }

    public static void test(){
        Tableware fork = new Tableware("fork");
        Tableware knife = new Tableware("knife");
        TablewarePair pair = new TablewarePair(fork,knife);
        new EatNoodleThread1("A",pair).start();
        new EatNoodleThread1("B",pair).start();
    }
}