经典的生产者消费者-----多线程

最新推荐文章于 2024-02-10 12:15:21 发布

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#多线程 #table #random #thread #string #class

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本文通过Java代码实现了一个典型的生产者消费者模型。该模型利用了同步Table类来确保线程安全，其中生产者不断地生产产品并放入Table中，而消费者则从Table中取出并消费这些产品。代码展示了如何使用wait和notifyAll方法来协调生产者和消费者之间的活动。

public class Table extends LinkedList { private int capity; public Table(int capity) { super(); this.capity = capity; } public synchronized void addFood(Food food){ while(size() >= capity){ try { wait(); } catch (InterruptedException e) { System.out.print("has error:" + e.getMessage()); e.printStackTrace(); return; } } System.out.println("Add one product now size is:" + size()); this.add(food); notifyAll(); } public synchronized Food getFood(){ while(size() <= 0){ try { wait(); } catch (InterruptedException e) { System.out.print("has error:" + e.getMessage()); e.printStackTrace(); return null; } } System.out.println("Get one product now size is:" + size()); Food food = (Food)this.removeFirst(); notifyAll(); return food; } }

以上是定义一个同步Table

public class Worker extends Thread { private Table table; private String name; public void run() { while(true){ Food food = product(); table.addFood(food); System.out.println("Worker[" + name + "] produce one product"); } } private Food product() { Random random = new Random(); try { Thread.sleep(5500+random.nextInt(500)); } catch (InterruptedException e) { System.out.println("Worker[" + name + "] sleep error"); e.printStackTrace(); } return new Food(); } private void addFood(Food food){ table.addFood(food); } public Worker(String name, Table table) { super(); this.name = name; this.table = table; } }

生产者

public class Customer extends Thread{ private String name; private Table table; public Customer(String name,Table table) { super(); this.name = name; this.table = table; } private void eat(Food food){ Random random = new Random(); try { Thread.sleep(4500+random.nextInt(500)); } catch (InterruptedException e) { System.out.print("Customer[" + name + "] sleep error"); e.printStackTrace(); } food = null; } private Food getFood(){ return table.getFood(); } public void run() { while(true){ Food food = getFood(); System.out.println("customer[" + name + "] eat one product"); eat(food); } } }

消费者

public class CustomerTest { /** * @param args */ public static void main(String[] args) { int productSize = 10; int customerSize = 8; int tableSize = 12; Table table = new Table(tableSize); Thread[] workers = new Thread[productSize]; Thread[] customers = new Thread[customerSize]; for(int i = 0; i < productSize;i++){ Worker worker = new Worker("worker" + i,table); workers[i] = worker; } for(int i = 0; i < customerSize;i++){ Customer customer = new Customer("customer" + i,table); customers[i] = customer; } for(int i = 0; i < workers.length; i++){ workers[i].start(); } for(int i = 0; i < customers.length; i++){ customers[i].start(); } } }

测试类