信号量实例

来源：互联网发布：网络加油站网站编辑：程序博客网时间：2024/05/01 23:13
package cn.hc.sort.thread;import java.util.ArrayList;import java.util.List;import java.util.concurrent.BlockingQueue;import java.util.concurrent.Semaphore;/** * 信号量实例 * Created by yhc on 2015/5/5. */public class SemaphoreTest {    private static class Connection {        private int id;        public int getId() {            return id;        }        public void setId(int id) {            this.id = id;        }    }    private static class Pool {        private List<Connection> idlePool = new ArrayList<Connection>(32);        private List<Connection> usedPool = new ArrayList<Connection>(32);        private Semaphore semaphore=new Semaphore(32);        public void init() {            //初始化连接            System.out.println("初始化连接池...");            for (int i = 0; i < 32; i++) {                Connection connection=new Connection();                connection.setId(i);                idlePool.add(connection);            }        }        /****         * 初始化连接         * @return         */        public Connection get(){            try{                System.out.println("获取连接对象,连接数量:"+semaphore.availablePermits());                semaphore.acquire();                Connection connection= idlePool.remove(0);                usedPool.add(connection);                System.out.println("获取连接,id="+connection.getId());                return connection;            }catch(Exception e){             e.printStackTrace();            }            return null;        }        /**         * 释放连接         * @param connection         */        public void release(Connection connection){             try{                 System.out.println("释放连接,可用连接数:"+semaphore.availablePermits());                 usedPool.remove(connection);                 idlePool.add(connection);                 System.out.println("释放连接,id="+connection.getId());             }catch (Exception e){                 e.printStackTrace();             }finally {                 semaphore.release();             }        }    }    public static void main(String[] args) {        SemaphoreTest semaphoreTest=new SemaphoreTest();        final Pool pool=new SemaphoreTest.Pool();        pool.init();        for (int i = 0; i < 100; i++) {           Thread thread=new Thread(new Runnable() {               @Override               public void run() {                   Connection connection = pool.get();                   //TODO 复杂的操作,加载数据...                   try {                       Thread.sleep(2000);                   } catch (InterruptedException e) {                       e.printStackTrace();                   }finally {                       //释放连接                       pool.release(connection);                   }               }           });           thread.start();        }        System.out.println("End");    }}
0 0