| 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 | while(isFull()) {\r |
| 34 | try {\r |
| 35 | System.out.println("Buffer is full: " + Thread.currentThread().getName()\r |
| 36 | + " is waiting, size: " + nbObj);\r |
| 37 | \r |
| 38 | wait();\r |
| 39 | }\r |
| 40 | catch (InterruptedException e) {}\r |
| 41 | }\r |
| 42 | nbObj++;\r |
| 43 | tampon[prem] = obj;\r |
| 44 | prem = (prem + 1) % taille;\r |
| 45 | //System.out.println(Thread.currentThread().getName() + " a depose " + (Integer)obj);\r |
| 46 | notify();\r |
| 47 | }\r |
| 48 | \r |
| 49 | \r |
| 50 | public synchronized Object preleve() {\r |
| 51 | while(isEmpty()) {\r |
| 52 | try {\r |
| 53 | System.out.println("Buffer is empty: " + Thread.currentThread().getName()\r |
| 54 | + " is waiting, size: " + nbObj);\r |
| 55 | wait();\r |
| 56 | }\r |
| 57 | catch (InterruptedException e) {}\r |
| 58 | }\r |
| 59 | Object outObj = null;\r |
| 60 | nbObj--;\r |
| 61 | outObj = tampon[der];\r |
| 62 | der = (der + 1) % taille;\r |
| 63 | //System.out.println(Thread.currentThread().getName() + " a preleve " + (Integer)outObj);\r |
| 64 | notify();\r |
| 65 | return outObj;\r |
| 66 | }\r |
| 67 | \r |
| 68 | } // fin class BufferCirc\r |