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import java.util.ArrayList;
/**
* 多生产者多消费者单仓库的生产者消费者模式
* @author breezefaith
*
*/
class Product{
private int productId;
public Product(int productId) {
super();
this.productId = productId;
}
@Override
public String toString() {
return "Product["+productId+"]";
}
}
class Repository{
private int maxSize;
private ArrayList<Product> list;
public Repository(int maxSize) {
super();
this.maxSize = maxSize;
list=new ArrayList<>(maxSize);
}
public void setMaxSize(int maxSize) {
if(maxSize<=list.size()) {
System.err.println("New size is smaller than the original.");
return;
}
ArrayList<Product> newList=new ArrayList<>(maxSize);
newList.addAll(list);
list=newList;
}
public int getMaxSize() {
return maxSize;
}
public int getCurrentSize() {
return list.size();
}
public void push(Product product) {
list.add(product);
}
public Product pop() {
return list.remove(0);
}
}
class Producer extends Thread{
private Repository repository;
private static int productId;
public Producer(Repository repository) {
super();
this.repository = repository;
}
public Product produce() {
Product product=new Product(productId++);
System.out.println("生产者 "+Thread.currentThread().getName()+" 生产了产品 "+product+",剩余:"+(repository.getCurrentSize()+1));
return product;
}
@Override
public void run() {
synchronized (repository) {
try {
while(true) {
Thread.sleep(1000);
if(repository.getCurrentSize()<repository.getMaxSize()) {
repository.push(produce());
}else {
System.err.println("Producer "+Thread.currentThread().getName()+" want to produce a product, but repository is full.");
}
repository.notifyAll();
repository.wait();
}
}catch(InterruptedException e) {
e.printStackTrace();
}
}
}
}
class Consumer extends Thread{
private Repository repository;
public Consumer(Repository repository) {
super();
this.repository = repository;
}
public Product consume() {
Product product=repository.pop();
System.out.println("消费者 "+Thread.currentThread().getName()+" 消费了产品 "+product+",剩余:"+repository.getCurrentSize());
return product;
}
@Override
public void run() {
synchronized (repository) {
try {
while(true) {
Thread.sleep(1000);
if(repository.getCurrentSize()>0) {
consume();
}else {
System.err.println("Consumer "+Thread.currentThread().getName()+" consume a product, but repository is empty.");
}
repository.notifyAll();
repository.wait();
}
}catch(InterruptedException e) {
e.printStackTrace();
}
}
}
}
public class Run {
public static void main(String[] args) {
Repository repository=new Repository(3);
Producer p1=new Producer(repository),
p2=new Producer(repository),
p3=new Producer(repository);
p1.setName("p1");
p2.setName("p2");
p3.setName("p3");
Consumer c1=new Consumer(repository),
c2=new Consumer(repository);
c1.setName("c1");
c2.setName("c2");
p1.start();
p2.start();
p3.start();
c1.start();
c2.start();
}
}