From 79005657d4d56697724e5e2d8a18322d4ace1200 Mon Sep 17 00:00:00 2001 From: szh <1220298025@qq.com> Date: Sun, 5 Dec 2021 19:13:48 +0800 Subject: [PATCH] 0.2ver --- README.md | 40 +++++++++++++----- .../java/springframework/BeanFactory.java | 18 ++------ src/test/java/Test.java | 23 +++++++--- src/test/java/pojo/User.java | 2 +- .../springframework/BeanDefinition.class | Bin 486 -> 0 bytes .../classes/springframework/BeanFactory.class | Bin 961 -> 178 bytes target/test-classes/Test.class | Bin 708 -> 1309 bytes target/test-classes/pojo/User.class | Bin 467 -> 467 bytes 8 files changed, 50 insertions(+), 33 deletions(-) delete mode 100644 target/classes/springframework/BeanDefinition.class diff --git a/README.md b/README.md index b94fcb9..6b8f390 100644 --- a/README.md +++ b/README.md @@ -16,26 +16,44 @@ -## 0.1ver +## 0.2ver -最简单的实现，只包含一个容器 +改动0.1ver，添加实现以下内容： -![image-20211205152755313](https://gitee.com/mrth4869/pic/raw/master/20211205152755.png) +1.**将对象的创建交给容器（实例化）** -先不考虑bean定义信息的获取、信息存放、实例化问题以及bean的存放等问题 +2.**以单例模式从缓存中获取对象** -只考虑： +3.**异常** -1.**托管对象**（托管指对象已经存在） - -2.**获取对象** +4.**更好的扩展性** #### 设计思路 -主要考虑托管的实现，即存在多个对象的时候必须有某种数据结构来存放； +**容器创建对象（实例化）可以通过反射来实现**： + +1. 将获取到的Class对象，封装成类信息BeanDefinition，注册（存放）到一个注册表BeanDefinitionRegistry中 +2. 从注册表中获取类信息，通过反射创建对象 + +**单例模式与缓存的实现：** + +使用HashMap作为缓存（单例注册表）SingletonBeanRegistry，存放实例化的对象； + +实例化对象前先去检查缓存，缓存有，则取缓存；反之则实例化新对象； + +**更好的扩展性：** + +![image-20211205174359137](https://gitee.com/mrth4869/pic/raw/master/20211205174359.png) + +
接口只定义核心的功能，由抽象类实现并规范附加功能，直到某个实现类完善所有未实现的功能
+ + + +例如对于BeanFactory，其核心方法为`getBean`，那么不妨将其制成接口，将此方法交由抽象类AbstractBeanFactory实现，而AbstractBeanFactory本身又规范了附加功能； -我们希望通过名字就可以进行管理，那么键值对就是个很好的选择，即存放到map中； +又例如对于BeanDefiinitionRegistry类信息注册表而言，其核心是提供`registerBeanDefinition`方法，故可以制成接口 -我们希望其拥有较好的获取/查找的效率，那么可以选择用HashMap用于存放对象 +又例如对于SingletonBeanRegistry单例注册表（单例缓存）而言，其核心是提供`getSingleton`方法，故也可以制成接口； +![image-20211205175044261](https://gitee.com/mrth4869/pic/raw/master/20211205175044.png) \ No newline at end of file diff --git a/src/main/java/springframework/BeanFactory.java b/src/main/java/springframework/BeanFactory.java index ae07dc3..3dd5044 100644 --- a/src/main/java/springframework/BeanFactory.java +++ b/src/main/java/springframework/BeanFactory.java @@ -1,24 +1,12 @@ package springframework; -import java.util.Map; -import java.util.concurrent.ConcurrentHashMap; /** * @Author:吉口吉 * @Date:Created in 14:17 2021/12/5 - * @Description: 容器，用HashMap托管bean + * @Description: */ -public class BeanFactory { - - private Map beanMap = new ConcurrentHashMap<>(); - - public Object getBean(String name) {//bean的获取 - return beanMap.get(name); - } - - public void registerBean(String name, Object bean) {//托管bean - beanMap.put(name, bean); - } - +public interface BeanFactory {//容器 + public Object getBean(String name); } diff --git a/src/test/java/Test.java b/src/test/java/Test.java index 5357f74..1120653 100644 --- a/src/test/java/Test.java +++ b/src/test/java/Test.java @@ -1,14 +1,25 @@ import pojo.User; import springframework.BeanFactory; +import springframework.config.BeanDefinition; +import springframework.support.DefaultListableBeanFactory; public class Test { public static void main(String[] args){ - //1.初始化容器BeanFactory - BeanFactory beanFactory=new BeanFactory(); - //2.托管bean - beanFactory.registerBean("user",new User()); + //1.初始化容器 + DefaultListableBeanFactory factory=new DefaultListableBeanFactory(); + //2.注册bean的定义信息（class对象） + BeanDefinition beanDefinition=new BeanDefinition(User.class); + factory.registerBeanDefinition("user",beanDefinition); //3.获取bean - User u=(User)beanFactory.getBean("user"); - u.UserSpeak(); + User u1=(User)factory.getBean("user"); + u1.userSpeak(); + //4.再次获取bean + User u2=(User)factory.getBean("user"); + u2.userSpeak(); + + System.out.println(u1); + System.out.println(u2); + if (u1==u2) System.out.println("两者内存地址相同"); + else System.out.println("两者内存地址不同"); } } diff --git a/src/test/java/pojo/User.java b/src/test/java/pojo/User.java index 363ea68..e32ea8d 100644 --- a/src/test/java/pojo/User.java +++ b/src/test/java/pojo/User.java @@ -1,5 +1,5 @@ package pojo; public class User { - public void UserSpeak(){System.out.println("你好");} + public void userSpeak(){System.out.println("你好");} } diff --git a/target/classes/springframework/BeanDefinition.class b/target/classes/springframework/BeanDefinition.class deleted file mode 100644 index edf25d01d21255c4a09cbf4f8fb57c5ebc77fb30..0000000000000000000000000000000000000000 GIT binary patch literal 0 HcmV?d00001 literal 486 zcmaJ-%TB^T6g{^TE44i2<<961FtHnV8W(C8w=~h1xbOq~DC22i zqaqsBlW89>ha69jL@){R*_xJ2MyT1@ni*MB`DS zX8I{k?)@`<;X;qHFcU`%cE&o*KtZ$9U5^&H*YP45>b}Xs8o%|2*(4quv^^BDA=v#t zPf+_iyP(kN4zSNf*<75!%A8nPtQ~CfEV1jew|Kj~cS!Hx4c1G}ad}p#1-7X7$St!1 u+DkT(GCS&WSD{-4)s?5uTliM&y~28CVUY%gXJ9S2@s@;@4ZokWwtoO5M_~&9 diff --git a/target/classes/springframework/BeanFactory.class b/target/classes/springframework/BeanFactory.class index 00a34a2d14b12d88494193a909e6a0651763db12..c7c52b924e10de0bb9c0486c9edf9c0473894ffe 100644 GIT binary patch delta 63 zcmX@ezKK!b)W2Q(7#J8#7&zG(*x4C4CVnuTJdIIq@)t%!IW|THMg}IJECT~03nK$F O0}F`7zzQUp7}x;d@(LgT literal 961 zcmaKqTW`}q5QWd$CMJnPLZRhSTFR|WQbb-rLP`}RDpfoL`VdsaoE@IWi?FuZcmf>QpiaWS#mU}Ml zyLcer4wVdF%85X|e;_}~P7(*>4ijC0@*o(6GETG-cyjXZRu+zBIO+^y9fYH9A+tL? 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