Java:
public class ProducerAndConsumer<T> {
private boolean available = false;
private Map<T, T> map;
private T i;
Semaphore mutex ;
Semaphore notEmpty;
public ProducerAndConsumer(int n, Semaphore mutex, Semaphore notEmpty) {
map = new HashMap<>(n);
this.mutex = mutex;
this.notEmpty = notEmpty;
}
public void add(T key, T value) throws InterruptedException {
try {
mutex.acquire();
map.put(key, value);
} finally {
notEmpty.release();
}
}
public T remove(T key) throws InterruptedException {
try {
notEmpty.acquire();
T elem = map.remove(key);
if (elem == null) {
System.out.println(key + ": " + elem + " is Null");
throw new NullPointerException();
} else {
return elem;
}
}finally {
mutex.release();
}
}
public T getValue(T key) throws InterruptedException {
T value = map.get(key);
return value;
}
}
class Producer extends Thread {
static Random generator = new Random();
private int number;
ProducerAndConsumer producerAndConsumer;
Random random;
Semaphore mutex = new Semaphore(1);
Semaphore notEmpty = new Semaphore(0);
public Producer(int number, ProducerAndConsumer producerAndConsumer) {
this.producerAndConsumer = producerAndConsumer;
this.number = number;
random = new Random();
}
@Override
public void run() {
for (int i = 0; i < 3; i++) {
try {
Thread.currentThread().sleep(Math.abs(generator.nextInt() % 1000));
} catch (InterruptedException e) {
}
;
try {
producerAndConsumer.add(i, random.nextInt());
System.out.println("Producer: " + number + ": " + i + " produziert!");
} catch (InterruptedException exception) {
exception.printStackTrace();
}
}
}
}
class Consume extends Thread {
static Random generator = new Random();
private int number;
ProducerAndConsumer producerAndConsumer;
Random random;
Semaphore mutex = new Semaphore(1);
Semaphore notEmpty = new Semaphore(0);
public Consume(int number, ProducerAndConsumer producerAndConsumer) {
this.producerAndConsumer = producerAndConsumer;
this.number = number;
random = new Random();
}
@Override
public void run() {
for (int i = 0; i < 3; i++) {
try {
Thread.currentThread().sleep(Math.abs(generator.nextInt() % 1000));
} catch (InterruptedException e) {
}
;
try {
producerAndConsumer.remove(i);
System.out.println("Producer: " + number + ": " + i + " konzumiert!");
} catch (InterruptedException exception) {
exception.printStackTrace();
}
}
}
}
class Main2 {
public static void main(String[] args) throws InterruptedException {
Semaphore mutex = new Semaphore(1);
Semaphore notEmpty = new Semaphore(0);
ProducerAndConsumer<Integer> producerAndConsumer = new ProducerAndConsumer<>(10, mutex, notEmpty);
Random random = new Random(10);
for (int i = 0; i < 3; i++) {
Producer producer = new Producer(i, producerAndConsumer);
producer.start();
}
for (int i = 0; i < 3; i++) {
Consume consume = new Consume(i, producerAndConsumer);
consume.start();
}
}
}Wenn ich ein Producer und ein Consumer habe, dann funktioniert aber wenn ich 3 Producer und 3 Consumer habe, wie in der Code, dann funktioniert nicht mehr.
Vielen Dank im Voraus
