生产者-消费者模式实现

标签：java   生产者   消费者   

public class MakerThread extends Thread {  
        private final Random random;  
        private final Table table;  
        private static int id = 0;   
        public MakerThread(String name, Table table, long seed) {  
                super(name);  
                this.table = table;//table就是桥梁参与者   
                this.random = new Random(seed);  
        }  
        public void run() {  
                try {  
                        while (true) {  
                                Thread.sleep(random.nextInt(1000));//生产数据要耗费时间   
                                //生产数据
                                String cake = "[ Cake No." + nextId() + " by " + getName() + " ]";   
                                table.put(cake);//将数据存入桥梁参与者   
                        }  
                } catch (InterruptedException e) {  
                }  
        }  
        private static synchronized int nextId() {  
                return id++;  
        }  
}  

再来看看消费者：
//消费者线程

public classEaterThread extends Thread {
        private final Random random;
        private final Table table;
        public EaterThread(String name, Table table,long seed) {
                super(name);
                this.table = table;
                this.random = new Random(seed);
        }
        public void run() {
                try {
                        while (true) {
                                String cake = table.take();//从桥梁参与者中取数据
                             Thread.sleep(random.nextInt(1000));//消费者消费数据要花时间
                        }
                } catch (InterruptedException e) {
                }
        }
}

看来在这个模式里table是个很重要的角色啊，让我们来看看他吧（这里只给出个简单的）：

public class Table {  
        private final String[] buffer;  
        private int tail;  //下一个放put（数据）的地方    
        private int head;  //下一个取take（数据）的地方   
        private int count; // buffer内的数据数量   
        public Table(int count) {  
                this.buffer = new String[count];//总量是确定的   
                this.head = 0;  
                this.tail = 0;  
                this.count = 0;  
        }  
        // 放置数据   
        public synchronized void put(String cake) throws InterruptedException {  
                System.out.println(Thread.currentThread().getName() + " puts " + cake);  
                while (count >= buffer.length) {//数据放满了就只能等待   
                        wait();  
                }  
                buffer[tail] = cake;  
                tail = (tail + 1) % buffer.length;  
                count++;  
                notifyAll();//有数据了，唤醒线程去取数据   
        }  

        // 取得数据   
        public synchronized String take() throws InterruptedException {  
                while (count <= 0) {//没有数据就只能等待   
                        wait();  
                }  
                String cake = buffer[head];  
                head = (head + 1) % buffer.length;  
                count--;  
                notifyAll();//有位置可以放数据了，唤醒线程，不等了   
                System.out.println(Thread.currentThread().getName() + " takes " + cake);  
                return cake;  
        }  
}

好了我们来实验吧：

public class Main {  
        public static void main(String[] args) {  
                Table table = new Table(3);     // 建立可以放置数据的桥梁参与者，3是他所能放置的最大数量的数据。
                new MakerThread("MakerThread-1", table, 31415).start();//生产数据   
                new MakerThread("MakerThread-2", table, 92653).start();  
                new MakerThread("MakerThread-3", table, 58979).start();  
                new EaterThread("EaterThread-1", table, 32384).start();//消费数据   
                new EaterThread("EaterThread-2", table, 62643).start();  
                new EaterThread("EaterThread-3", table, 38327).start();  
        }  
}  

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生产者-消费者模式实现

标签：java   生产者   消费者   

原文地址：http://blog.51cto.com/13538361/2091394