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