生产者消费者问题

基于wait和notify的实现

package shengchanzhexiaofeizhe;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Test01 {
    public static void main(String[] args){
        List<Task> buffer=new ArrayList<>(Constants.MAX_BUFFER_SIZE);
        ExecutorService es=Executors.newFixedThreadPool(Constants.NUM_OF_CONSUMER+Constants.NUM_OF_PRODUCER);
        for(int i=1;i<=Constants.NUM_OF_PRODUCER;++i){
            es.execute(new Producer(buffer));
        }
        for(int i=1;i<=Constants.NUM_OF_CONSUMER;++i){
            es.execute(new Consumer(buffer));
        }
    }
}

/**
 * 公共常量
 * @author ZHANGTIANCHENG
 *
 */
class Constants{
    public static final int MAX_BUFFER_SIZE = 10;
    public static final int NUM_OF_PRODUCER = 2;
    public static final int NUM_OF_CONSUMER = 3;
}

/**
 * 工作任务
 * @author ZHANGTIANCHENG
 *
 */
class Task{
    private String id;
    
    public Task(){
        id=UUID.randomUUID().toString();
    }
    
    @Override
    public String toString(){
        return "Task["+id+"]";
    }
}

class Consumer implements Runnable{
    private List<Task> buffer;
    
    public Consumer(List<Task> buffer){
        this.buffer=buffer;
    }

    @Override
    public void run() {
        while(true){
            synchronized(buffer){
                while(buffer.isEmpty()){
                    try{
                        buffer.wait();
                    }catch(InterruptedException e){
                        e.printStackTrace();
                    }
                }
                Task task=buffer.remove(0);
                buffer.notifyAll();
                System.out.println("Consumer:"+Thread.currentThread().getName()+"]got"+task);
            }
        }
    }
    
}

class Producer implements Runnable{
    private List<Task> buffer;
    
    public Producer(List<Task> buffer){
        this.buffer=buffer;
    }
    
    @Override
    public void run() {
        while(true){
            synchronized(buffer){
                while(buffer.size()>=Constants.MAX_BUFFER_SIZE){
                    try{
                        buffer.wait();
                    }catch(InterruptedException e){
                        e.printStackTrace();
                    }
                }
                Task task=new Task();
                buffer.add(task);
                buffer.notifyAll();
                System.out.println("Producer["+Thread.currentThread().getName()+"]put"+task);
            }
        }
    }
    
}

基于BlockingQueue的实现

package shengchanzhexiaofeizhe;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;

public class Test01 {
    public static void main(String[] args){
        BlockingQueue<Task> buffer=new LinkedBlockingQueue<>(Constants.MAX_BUFFER_SIZE);
        ExecutorService es=Executors.newFixedThreadPool(Constants.NUM_OF_CONSUMER+Constants.NUM_OF_PRODUCER);
        for(int i=1;i<=Constants.NUM_OF_PRODUCER;++i){
            es.execute(new Producer(buffer));
        }
        for(int i=1;i<=Constants.NUM_OF_CONSUMER;++i){
            es.execute(new Consumer(buffer));
        }
    }
}

/**
 * 公共常量
 * @author ZHANGTIANCHENG
 *
 */
class Constants{
    public static final int MAX_BUFFER_SIZE = 10;
    public static final int NUM_OF_PRODUCER = 2;
    public static final int NUM_OF_CONSUMER = 3;
}

/**
 * 工作任务
 * @author ZHANGTIANCHENG
 *
 */
class Task{
    private String id;
    
    public Task(){
        id=UUID.randomUUID().toString();
    }
    
    @Override
    public String toString(){
        return "Task["+id+"]";
    }
}

class Consumer implements Runnable{
    private BlockingQueue<Task> buffer;
    
    public Consumer(BlockingQueue<Task> buffer){
        this.buffer=buffer;
    }
    
    @Override
    public void run() {
        while(true){
            try{
                Task task=buffer.take();
                System.out.println("Consumer["+Thread.currentThread().getName()+"]got"+task);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
    
}

class Producer implements Runnable{
    private BlockingQueue<Task> buffer;
    
    public Producer(BlockingQueue<Task> buffer){
        this.buffer=buffer;
    }

    @Override
    public void run() {
        while(true){
            try{
                Task task=new Task();
                buffer.put(task);
                System.out.println("Producer["+Thread.currentThread().getName()+"]put"+task);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
}