Commit | Line | Data |
---|---|---|
396bc743 JB |
1 | \r |
2 | \r | |
3 | /**\r | |
4 | * implementation du producteur consommateur avec un buffer circulaire\r | |
5 | */\r | |
6 | public class BufferCirc {\r | |
7 | \r | |
8 | private Object[] tampon;\r | |
9 | private int taille;\r | |
10 | private int prem, der, nbObj;\r | |
11 | \r | |
12 | \r | |
13 | public BufferCirc (int t) {\r | |
14 | taille = t;\r | |
15 | tampon = new Object[taille];\r | |
16 | prem = 0;\r | |
17 | der = 0;\r | |
18 | nbObj = 0;\r | |
19 | }\r | |
20 | \r | |
21 | \r | |
22 | public boolean isEmpty() {\r | |
23 | return nbObj == 0;\r | |
24 | }\r | |
25 | \r | |
26 | \r | |
27 | public boolean isFull() {\r | |
28 | return nbObj == taille;\r | |
29 | }\r | |
30 | \r | |
31 | \r | |
32 | public synchronized void depose(Object obj) {\r | |
33 | if (!isFull()) {\r | |
34 | nbObj++;\r | |
35 | tampon[prem] = obj;\r | |
36 | prem = (prem + 1) % taille;\r | |
37 | System.out.println(Thread.currentThread().getName() + " a depose " + (Integer)obj);\r | |
38 | } else {\r | |
39 | System.out.println("Buffer plein pour " + Thread.currentThread().getName());\r | |
40 | }\r | |
41 | }\r | |
42 | \r | |
43 | \r | |
44 | public synchronized Object preleve() {\r | |
45 | Object outObj = null;\r | |
46 | if (isEmpty()) {\r | |
47 | nbObj--;\r | |
48 | outObj = tampon[der];\r | |
49 | der = (der + 1) % taille;\r | |
50 | System.out.println(Thread.currentThread().getName() + " a preleve " + (Integer)outObj);\r | |
51 | } else {\r | |
52 | System.out.println("Buffer vide pour " + Thread.currentThread().getName());\r | |
53 | }\r | |
54 | return outObj;\r | |
55 | }\r | |
56 | \r | |
57 | } // fin class BufferCirc\r |