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<h1 id="RPC框架中的反射加速"><a href="#RPC框架中的反射加速" class="headerlink" title="RPC框架中的反射加速"></a>RPC框架中的反射加速</h1><p>一般的RPC框架都会在客户端进行动态代理，以屏蔽掉底层的RPC框架和网络通讯细节达到伪装成本地调用的效果，以简化使用者的操作。常见的动态代理技术像JDK动态代理、GGLIB(底层ASM)、Javassist、ASM等其实都是运行时的字节码生成技术。<br>本文我们跳过客户端的动态代理实现，讲的是RPC框架中服务端对请求方法的调用方式：<br>
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<h1 id="zookeeper-Watcher机制"><a href="#zookeeper-Watcher机制" class="headerlink" title="zookeeper Watcher机制"></a>zookeeper Watcher机制</h1><p> 一个zk的节点可以被监控，包括这个目录中存储的数据的修改，子节点目录的变化，一旦变化可以通知设置监控的客户端，这个功能是zookeeper对于<br> 应用最重要的特性，通过这个特性可以实现的功能包括配置的集中管理，集群管理，分布式锁等等。</p>
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<h1 id="Spring-Bean生命周期"><a href="#Spring-Bean生命周期" class="headerlink" title="Spring Bean生命周期"></a>Spring Bean生命周期</h1><ol>
<li>容器寻找Bean的定义信息，并将其实例化。会对scope为singleton且非懒加载的bean进行实例化</li>
<li>使用依赖注入，Spring按照Bean定义信息配置Bean的所有属性。(populateBean) ,该方法会调用对应的的BeanPostProcessor来进行一些属性的注入。例如@Autowire和@Value属性。</li>
<li>如果Bean实现了BeanNameAware接口，工厂调用Bean的setBeanName()方法传递Bean的id。(initializeBean)</li>
<li>如果实现了BeanFactoryAware接口，工厂调用setBeanFactory()方法传入工厂自身。(initializeBean)
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<p><a href="https://juejin.im/entry/58f5e080b123db2fa2b3c4c6" target="_blank" rel="noopener">工厂模式——看这一篇就够了</a></p>
<p>优点：<br>工厂模式的好处就是为系统结构提供灵活的动态扩展机制.减速少工作量,方便维护.<br>工厂类一个用处就是尽量解耦合</p>
<p>1 工厂方法封装了对象创建的细节,将对象创建代码和其他部分脱离,减少相干性.<br>2 有利于同类对象创建的统一管理和控制<br>3 你所关心的仅仅是工厂方法返回的接口方法,不必关心实现细节</p>
<p>面向对象的封装(Encapsulation)和分派(Delegation)告诉我们，尽量将长的代码分派“切割”成每段，将每段再“封装 ”起来(减少段和段之间偶合联系性)，这样，就会将风险分散，以后如果需要修改，只要更改每段，不会再发生牵一动百的事情。</p>
<p>1、抽象工厂模式隔离了具体类的生产，使得客户并不需要知道什么被创建。<br>2、当一个产品族中的多个对象被设计成一起工作时，它能保证客户端始终只使用同一个产品族中的对象。<br>3、增加新的具体工厂和产品族很方便，无须修改已有系统，符合“开闭原则”。</p>
<p>缺点：<br>增加新的产品等级结构很复杂，需要修改或者增加抽象工厂和所有的具体工厂类，对“开闭原则”的支持呈现倾斜性。</p>
<p>实际使用Spring FactoryBean，相当于工厂方法模式</p>
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<a class="post-title-link" href="/2018/09/30/ReentrantReadWriteLock源码分析/" itemprop="url">ReentrantReadWriteLock源码分析</a></h1>
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<p>关于读写锁的源码分析，网上已经有很多了，本文就不再进行分析，可以看该文<a href="https://www.javadoop.com/post/reentrant-read-write-lock" target="_blank" rel="noopener">Java 读写锁 ReentrantReadWriteLock 源码分析</a>,<br>我这里只讲几个比较重要的地方。</p>
<h1 id="state变量在读写锁"><a href="#state变量在读写锁" class="headerlink" title="state变量在读写锁"></a>state变量在读写锁</h1><p>ReentrantReadWriteLock也是基于AQS构建的锁。我们都知道基于AQS构建的锁都利用state变量作为同步状态、资源数量。读写锁有读写两个模式，<br>即读共享，写排斥，独占模式和共享模式对于 state 的操作完全不一样，那读写锁 ReentrantReadWriteLock 中是怎么使用 state 的呢？<br>答案是将 state 这个 32 位的 int 值分为高 16 位和低 16位，分别用于共享模式和独占模式。</p>
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