1 | /**
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2 | * Describe class PC here.
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3 | *
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4 | *
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5 | * Created: Fri Jun 8 14:32:29 2007
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6 | *
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7 | * @author <a href="mailto:mattia.monga@unimi.it">Mattia Monga</a>
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8 | * @version 1.0
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9 | */
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10 |
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11 | class Actor extends Thread
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12 | {
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13 | public Actor(String nome){
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14 | super(nome);
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15 | }
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16 |
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17 | private Magazzino shared;
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18 | public final Magazzino getShared() {
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19 | return shared;
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20 | }
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21 | public final void setShared(final Magazzino newShared) {
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22 | this.shared = newShared;
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23 | }
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24 |
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25 | }
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26 |
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27 |
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28 | class Produttore extends Actor {
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29 | public Produttore(String nome, Magazzino b) {
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30 | super(nome);
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31 | setShared(b);
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32 | }
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33 |
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34 | public void run(){
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35 | int i = 0;
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36 | while(true){
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37 | System.out.println(getName() + ": Inserisco " + i + " nel buffer");
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38 | getShared().put(i);
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39 | i += 1;
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40 | }
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41 | }
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42 | }
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43 |
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44 | class Consumatore extends Actor{
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45 | public Consumatore(String nome, Magazzino b) {
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46 | super(nome);
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47 | setShared(b);
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48 | }
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49 | public void run(){
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50 | while(true){
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51 | int i = getShared().get();
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52 | System.out.println(getName() + ": Estraggo " + i + " dal buffer");
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53 |
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54 | }
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55 | }
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56 | }
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57 |
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58 | class Magazzino{
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59 | public final static int SIZE = 10;
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60 | private int[] memory = new int[SIZE];
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61 | private int quanti = 0;
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62 |
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63 | public final int get() {
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64 | String n = Thread.currentThread().getName();
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65 | synchronized(syncPC){
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66 | while(isVuoto()){
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67 | System.out.println(n + " ha tentato di leggere");
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68 | try {
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69 | syncPC.wait();
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70 | } catch (InterruptedException e) {
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71 | System.err.println(e);
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72 | }
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73 | }
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74 | int ris = memory[--quanti];
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75 | if (quanti == SIZE - 1) syncPC.notifyAll();
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76 | System.out.println(n + " ha letto");
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77 | return ris;
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78 | }
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79 | }
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80 |
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81 | public final void put(final int newMemory) {
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82 | String n = Thread.currentThread().getName();
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83 | synchronized(syncPC){
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84 | while (isPieno()){
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85 | System.out.println(n + " ha tentato di scrivere");
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86 | try {
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87 | syncPC.wait();
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88 | } catch (InterruptedException e) {
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89 | e.printStackTrace(System.err);
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90 | }
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91 | }
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92 | memory[quanti++] = newMemory;
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93 | if (quanti == 1) syncPC.notifyAll();
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94 | System.out.println(n + " ha scritto");
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95 | }
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96 | }
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97 |
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98 | public final boolean isVuoto() {
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99 | return quanti == 0;
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100 | }
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101 |
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102 | public final boolean isPieno() {
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103 | return quanti == SIZE;
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104 | }
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105 |
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106 | private Object syncPC = new Object();
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107 | }
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108 |
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109 |
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110 | public class PC {
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111 |
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112 | public static final void main(final String[] args) {
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113 | Magazzino x = new Magazzino();
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114 | Produttore a1 = new Produttore("Aldo", x);
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115 | Produttore a2 = new Produttore("Alberto", x);
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116 | Consumatore b = new Consumatore("Barbara", x);
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117 | a1.start();
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118 | b.start();
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119 | a2.start();
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120 | }
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121 |
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122 | }
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123 |
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124 |
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