生产者消费者模式示例-优快云博客

本文展示了一个典型的生产者消费者模式实现案例，通过Java代码详细解释了如何利用同步方法来控制生产者生产商品和消费者消费商品的过程。该案例中使用了ArrayList作为商品存放的数据结构，并且通过线程间的通知与等待机制确保了生产和消费过程的同步。

<pre name="code" class="html">package com.citibank.aimy.Examples.serialize; import java.util.ArrayList; public class ProductBox { private ArrayList ls = new ArrayList(); private int index = 0; //create 4 products one time. public synchronized void push(){ if(index>=8) try { this.wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("produce a new product:::"+index); // Product p = new Product(index); // ls.add(p); // System.out.println("add a new product:::"+((Product)ls.get(index)).getId()); index++; this.notify(); } public synchronized void push(Product p){ if(index==8)// try { this.wait(); System.out.println("Full"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } ls.add(p); p.setPlace(String.valueOf(index)); System.out.println("Produce::::::"+p); index++; this.notify(); } public synchronized void pop(){ if(index==0) try { this.wait(); System.out.println("Empty"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Product r = (Product) ls.remove(index-1); System.out.println("Consume:::::::"+r); index--; this.notify(); } } </pre><br/><span id="_xhe_temp" width="0" height="0" /><pre name="code" class="html">package com.citibank.aimy.Examples.serialize; import java.util.ArrayList; public class ProductBox { private ArrayList ls = new ArrayList(); private int index = 0; //create 4 products one time. public synchronized void push(){ if(index>=8) try { this.wait(); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("produce a new product:::"+index); // Product p = new Product(index); // ls.add(p); // System.out.println("add a new product:::"+((Product)ls.get(index)).getId()); index++; this.notify(); } public synchronized void push(Product p){ if(index==8)// try { this.wait(); System.out.println("Full"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } ls.add(p); p.setPlace(String.valueOf(index)); System.out.println("Produce::::::"+p); index++; this.notify(); } public synchronized void pop(){ if(index==0) try { this.wait(); System.out.println("Empty"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Product r = (Product) ls.remove(index-1); System.out.println("Consume:::::::"+r); index--; this.notify(); } } </pre><br/><span id="_xhe_temp" width="0" height="0" />

package com.citibank.aimy.Examples.serialize; public class Consumer extends Thread { private ProductBox b; public Consumer(ProductBox box){ this.b = box; } public void run(){ for(int i=0;i<10;i++){ b.pop(); } try { Thread.sleep((long) (Math.random()*2000)); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

package com.citibank.aimy.Examples.serialize; public class Product { public Product(String id){ this.id = id; } private String place; private String name; private String color; private String scale; private String id; public String getColor() { return color; } public void setColor(String color) { this.color = color; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getScale() { return scale; } public void setScale(String scale) { this.scale = scale; } public String getPlace() { return place; } public void setPlace(String place) { this.place = place; } public String toString(){ String ret = "this product id:::: "+this.id +" ,is placed in "+this.place; return ret; } }

package com.citibank.aimy.Examples.serialize; public class Producer extends Thread { private ProductBox b; public Producer(ProductBox box){ this.b = box; } public void run(){ for(int i=0;i<10;i++){ Product p = new Product(String.valueOf(i)); b.push(p); } try { Thread.sleep((long) (Math.random()*200)); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

package com.citibank.aimy.Examples.serialize; public class MainThread { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub ProductBox b = new ProductBox(); Producer p = new Producer(b); Consumer c = new Consumer(b); p.setPriority(Thread.MAX_PRIORITY); p.start(); c.start(); // Product[] ls = new Product[6]; // System.out.print(ls.length); } }

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