1 package pinx.thread;
2
3 import java.util.LinkedList;
4 import java.util.Queue;
5
6 public class ProducerConsumer {
7
8 Storage storage=null;
9 Query query=null;
10 public ProducerConsumer(int max){
11 storage=new Storage(max);
12 query=new Query();
13 }
14
15 public void start(){
16 Producter producter=new Producter();
17 Consumer consumer=new Consumer();
18 Thread thread1=new Thread(producter);
19
20 Thread thread2=new Thread(consumer);
21 Thread thread3=new Thread(consumer);
22 Thread thread4=new Thread(consumer);
23
24 thread1.start();
25 thread2.start();
26 thread3.start();
27 thread4.start();
28 }
29
30 /**
31 * @param args
32 */
33 public static void main(String[] args) {
34 ProducerConsumer pc=new ProducerConsumer(20);
35 pc.start();
36 }
37
38 class Product {
39 private int id;
40
41 public Product(int id) {
42 this.id = id;
43 }
44
45 public String toString() {
46 return "Product " + this.id;
47 }
48 }
49
50 class Query{
51 public Query(){}
52 public synchronized int get(){
53 return -1;
54 }
55 }
56
57 class Storage {
58 Queue<Product> queue = null;
59 int max = 0;
60
61 public Storage(int max) {
62 this.max = max;
63 this.queue = new LinkedList<Product>();
64 }
65
66 public synchronized void push(Product product) {
67 while (this.max == this.queue.size()) {
68 try {
69 this.wait();
70 } catch (InterruptedException e) {
71 e.printStackTrace();
72 }
73 }
74 this.queue.offer(product);
75 System.out.println("Producter has generated a product :"
76 + product.toString());
77 this.notifyAll();
78 }
79
80 public synchronized Product pop() {
81 while (this.queue.isEmpty()) {
82 try {
83 this.wait();
84 } catch (InterruptedException e) {
85 e.printStackTrace();
86 }
87 }
88 Product product = this.queue.poll();
89 System.out.println("Consumer has consumed a product :"
90 + product.toString()+" ~~~");
91 return product;
92 }
93 }
94
95 class Consumer implements Runnable {
96
97 public void run() {
98 while(true){
99 System.out.println(String.format("Producter get the query value : %d", query.get()));
100 storage.pop();
101 try {
102 Thread.sleep((int)(Math.random()*1000));
103 } catch (InterruptedException e) {
104 e.printStackTrace();
105 }
106 }
107 }
108 }
109
110 class Producter implements Runnable {
111
112 public void run() {
113 int index=0;
114 while(true){
115 System.out.println(String.format("Producter get the query value : %d~~~~~~~~~~~~~~~~~~~", query.get()));
116 storage.push(new Product(++index));
117 try {
118 Thread.sleep((int)(Math.random()*1000));
119 } catch (InterruptedException e) {
120 e.printStackTrace();
121 }
122 }
123 }
124 }
125
126 }
