Shulou(Shulou.com)06/03 Report--

本篇内容介绍了"如何使用Object-Pool对象池"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧!希望大家仔细阅读，能够学有所成!

Object-Pool 对象池

对于一个实例化比较困难的对象, 我们可以使用原型模式克隆一个对象, 这种方法是在创建的角度节约资源

另外一种节约资源的方法就是使用Object-Pool对象池模式, 它能将有限多个对象缓存起来,达到资源重复使用的目的,像我们常用的数据库连接池,其实就是保存了连接对象的 对象池.

public class SqlConnection { private Integer connectionId; public SqlConnection() { Random random = new Random(System.currentTimeMillis()); this.connectionId = random.nextInt(); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } }}

模拟SqlConnection创建时间需要很久的情况

public abstract class ObjectPool { private final Set canUse = new HashSet(); private final Set inUse = new HashSet(); protected abstract T create(); public synchronized T getOut() { if (canUse.isEmpty()) { canUse.add(create()); } var instance = canUse.iterator().next(); canUse.remove(instance); inUse.add(instance); return instance; } public synchronized void putIn(T instance) { inUse.remove(instance); canUse.add(instance); } @Override public synchronized String toString() { return String.format("可用=%d 使用中=%d", canUse.size(), inUse.size()); }}public class SqlConnectionPool extends ObjectPool{ @Override protected SqlConnection create() { return new SqlConnection(); }}public static void main(String[] args) { SqlConnectionPool sqlConnectionPool = new SqlConnectionPool(); System.out.println(sqlConnectionPool.toString()); var connection1 = sqlConnectionPool.getOut(); System.out.println(sqlConnectionPool.toString()); var connection2 = sqlConnectionPool.getOut(); var connection3 = sqlConnectionPool.getOut(); System.out.println(sqlConnectionPool.toString()); sqlConnectionPool.putIn(connection1); sqlConnectionPool.putIn(connection2); System.out.println(sqlConnectionPool.toString()); var connection4 = sqlConnectionPool.getOut(); var connection5 = sqlConnectionPool.getOut(); System.out.println(sqlConnectionPool.toString()); }"如何使用Object-Pool对象池"的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注网站，小编将为大家输出更多高质量的实用文章!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.