生產者消費者模型實現模擬實現

熟悉生產者消費者模型是學習多線程的編程的必經之路，它廣泛應用於各種系統中，如TCP消息隊列等。下面是模擬實現的代碼（爲什麼叫模擬，請看<二>真實實現就懂了）。

Store.java

package test.producerAndConsumer1;

/**
 * 倉庫類
 * create by qiuping.wu on 2015-08-10
 */
public class Store {
	private int count = 0;
	private final int MAX_NUM = 10;

	public void Produce() {
		while (count >= MAX_NUM) {
			System.out.println(Thread.currentThread().getName()+"FFFFFFFFFFFFFFFFFFFFFFFF隊列滿");
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		synchronized (this) {
			count++;
			System.out.println(Thread.currentThread().getName()+"++++++++++生產者往倉庫放入一件商品,count=" + count);
		}
	}

	public void Consume() {
		while (count <= 0) {
			System.out.println(Thread.currentThread().getName()+"00000000000隊列空");
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

		synchronized (this) {
			count--;
			System.out.println(Thread.currentThread().getName()+"---------------消費者取出一件商品,count=" + count);
		}
	}

	public static void main(String[] args) throws InterruptedException {
		// TODO Auto-generated method stub
		Store store  = new Store();
		store.Produce();
		store.Produce();
		store.Consume();
		store.Consume();
		store.Consume();
	}

}

Producer.java

package test.producerAndConsumer1;

/**
 * 生產者類
 * create by qiuping.wu on 2015-08-10
 */
public class Producer implements Runnable {
private Store store;
	public Producer(Store store) {
		this.store = store;
	}
	
	@Override
	public void run()
	{
		while(true)
		{
			store.Produce();
			
			try {
				Thread.sleep(900);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}

}

Consumer.java

package test.producerAndConsumer1;

/**
 * 消費者類
 * create by qiuping.wu on 2015-08-10
 */
public class Consumer implements Runnable {
	private Store store;

	public Consumer(Store store) {
		this.store = store;
	}

	@Override
	public void run() {
		while (true) {
			store.Consume();

			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

	}

}

測試一：生產者：消費者= 1:1

testSingle.java

package test.producerAndConsumer1;

/**
 * 單生產者單消費者測試類
 * create by qiuping.wu on 2015-08-10
 */
public class testSingle {

	public static void main(String[] args) {
		Store store  = new Store();
		Producer p = new Producer(store);
		Consumer c  = new Consumer(store);
		new Thread(p).start();
		new Thread(c).start();
	}

}

測試二：生產者：消費者= m:n

testMulti.java

package test.producerAndConsumer1;

/**
 * 多生產者多消費者測試類
 * create by qiuping.wu on 2015-08-10
 */
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class testMulti {

	public static void main(String[] args) {
		ExecutorService es = Executors.newCachedThreadPool();

		Store store = new Store();
		Producer p = new Producer(store);
		Consumer c = new Consumer(store);

		for (int i = 0; i < 3; i++) {
			es.submit(p);
		}
		for (int i = 0; i < 4; i++) {
			es.submit(c);
		}

	}

}