java版的生產者消費者模型

package com.qing.java8;

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author liuchangqing
 * @time 2016年4月9日下午2:18:02
 * @function 4個生產者線程，1個消費者線程
 * A生產者 1
 * B 2
 * C 3
 * D 4
 * 且只能順序生產，12341234，消費者順序消費
 * 數據存放到數組products[13]中
 * 每個生產200次
 */
public class CTest {

    private ReentrantLock lock = new ReentrantLock(true);
    private Condition condition = lock.newCondition();
    private int products[] = new int[13];

    private int serverCount = 4; // 生產者個數
    private int eachProSum = 200; // 每個生產者生產總數

    public static void main(String[] args) throws Exception {
        CTest main = new CTest();
        main.run();
    }

    void run() throws Exception {
        Executor executor = Executors.newFixedThreadPool(5);
        executor.execute(new Client());
        executor.execute(new Server(1));
        executor.execute(new Server(2));
        executor.execute(new Server(3));
        executor.execute(new Server(4));
    }

    private int getPos = 0; // 用於記錄目前讀取的位置

    class Server implements Runnable {
        private int count = 0;
        private int putPos;

        private int n;
        public Server(int n) {
            this.n = n;
            this.putPos = n-1;
        }

        @Override
        public void run() {
            while(true) {
                try {
                    lock.lock();
                    while(products[putPos % products.length] != 0 || putPos - getPos >= products.length) {
                        condition.await();
                    }
                    products[putPos % products.length] = n;
                    putPos +=serverCount;
                    count ++;
                } catch (Exception e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } finally {
                    lock.unlock();
                    if(count >= eachProSum) {
                        System.out.println("server "+n+" is done");                     
                        return;
                    }
                }
            }
        }


    }

    class Client implements Runnable {

        @Override
        public void run() {
            while(true) {
                if(products[getPos % products.length] == 0)
                    continue;
                try {
                    lock.lock();
                    System.out.print(products[getPos % products.length]+", ");
                    products[getPos % products.length] =0;
                    getPos ++;
                    condition.signalAll();
                } catch (Exception e) {
                    // TODO: handle exception
                    e.printStackTrace();
                } finally {
                    lock.unlock();
                    if(getPos >= eachProSum*serverCount) {
                        System.out.println("client is done");
                        return;
                    }
                }
            }
        }

    }
}

借鑑disruptor的思想，序號遞增。