生产者消费者模型的特点：
保证生产者不会在缓冲区满的时候继续向缓冲区放入数据，而消费者也不会在缓冲区空的时候，消耗数据。
当缓冲区满的时候，生产者会进入休眠状态，当下次消费者开始消耗缓冲区的数据时，生产者才会被唤醒，开始往缓冲区中添加数据；当缓冲区空的时候，消费者也会进入休眠状态，直到生产者往缓冲区中添加数据时才会被唤醒。
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| import lombok.extern.slf4j.Slf4j;
import java.util.concurrent.TimeUnit;
public class ProducerAndConsumerDemo {
public static void main(String[] args) {
Store store = new Store(10);
new Thread(new Producer(store), "producer").start();
new Thread(new Consumer(store), "consumer1").start();
new Thread(new Consumer(store), "consumer2").start();
}
}
@Slf4j
class Store {
private Integer capacity;
private Integer count = 0;
public Store(Integer capacity) {
this.capacity = capacity;
}
public Boolean isFull() {
return this.count >= this.capacity;
}
public Boolean isEmpty() {
return this.count <= 0;
}
synchronized void produce() throws InterruptedException {
if (this.isFull()) {
log.info("仓库满了，停止生产");
wait();
} else if (this.isEmpty()) {
log.info("仓库空了, 放入第" + count + "号位置，并通知消费者");
this.count++;
TimeUnit.SECONDS.sleep(1);
notifyAll();
} else {
log.info("放入第" + count + "号位置");
this.count++;
TimeUnit.SECONDS.sleep(1);
}
}
synchronized void consume() throws InterruptedException {
if (this.isEmpty()) {
log.info("仓库空了，停止消费");
wait();
} else if (this.isFull()) {
this.count--;
log.info("仓库满了，取出第" + count + "号位置, 并通知生产者");
TimeUnit.SECONDS.sleep(2);
notifyAll();
} else {
this.count--;
log.info("取出第" + count + "号位置");
TimeUnit.SECONDS.sleep(2);
}
}
}
class Producer implements Runnable {
private Store store;
public Producer(Store store) {
this.store = store;
}
@Override
public void run() {
while (true) {
try {
store.produce();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Consumer implements Runnable {
private Store store;
public Consumer(Store store) {
this.store = store;
}
@Override
public void run() {
while (true) {
try {
store.consume();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
|