Introduction

1 分布式和集中式的区别:

1.1 集中式版本控制系统CVS/SVN

工作原理:版本库集中存放在中央服务器,干活的时候使用自己电脑,因此先从中央服务器获取最新版本,再干活,结束后将自己的活推送到中央服务器;

缺点:必须在联网的情况下使用;中央服务器单点故障,若中心数据库所在磁盘损坏,且没有备份,则丢失所有数据;

1.2 分布式版本控制系统Git

工作原理:没有中央服务器,每个电脑上都是一个完整的版本库,只要交换对方的修改,把各自的修改推送给对方;通常也有一台充当”中央服务器“的电脑,其仅用于方便交换修改;无网络时可在本地工作,等连接到互联网可将修改发送回远程服务器;

优点:安全性高、不需联网

2 创建资源库:

本地创建资源库,允许只从新项目启动,在命令行窗口键入git init <项目名>,自动创建一个文件夹,其中包含隐藏文件夹.git;

添加远程目标,与其他人合作,键入git remote add origin https://github.com/XXX,Git要了解数据发送到哪,了解从哪里提取数据;通过cat .git/config命令查看[remote "origin"];


### Aspect Oriented Programming (AOP) Introduction and Basic Principles #### Definition of AOP Aspect-Oriented Programming represents a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It creates a new way to think about program structure, beyond objects, procedures or functions. Cross-cutting concerns refer to behaviors that span multiple points in an application, such as logging, transaction management, security checks, caching mechanisms, etc.[^1] #### Core Concepts The core concepts within AOP include aspects, join points, pointcuts, advice, introductions, weaving, and interceptors. - **Aspects**: An aspect defines a particular concern affecting many parts of an application. - **Join Points**: These represent specific points during execution where additional behavior can be inserted—such as method calls, exception handling blocks, field access operations, etc. - **Pointcuts**: Pointcuts define precisely which join points should have extra functionality applied; they match one or more join points based on certain criteria defined through expressions. - **Advice**: Advice encapsulates actions taken around join points matched by associated pointcut definitions—it specifies what action needs performing before/after/before-and-after those moments occur. - **Introductions**: Introducing new methods or fields into existing classes without modifying their source code directly allows adding capabilities not originally present while maintaining original class integrity. - **Weaving**: Weaving refers to combining aspects with other pieces of software to create final woven programs ready for deployment. This process happens either statically at compile-time or dynamically at runtime depending upon implementation strategies chosen. - **Interceptors**: Interceptors act similarly to advices but operate specifically over service layer invocations often found inside enterprise applications built following layered architectures patterns like MVC. ```java @Aspect public class LoggingAspect { @Before("execution(* com.example.service.*.*(..))") public void logMethodEntry(JoinPoint joinPoint){ System.out.println("Entering Method : " + joinPoint.getSignature().getName()); } } ``` This example demonstrates how simple it becomes implementing logging across all services under `com.example.service` package using just few lines thanks to powerful features provided by frameworks supporting this approach natively such as Spring Framework's AOP module. --related questions-- 1. What are some common use cases for applying AOP? 2. How does AOP differ from OOP paradigms concerning design principles? 3. Can you provide examples illustrating different types of advice available in AOP implementations? 4. Explain the concept of 'weaving' in relation to AOP and its significance. 5. Discuss potential drawbacks or challenges faced when adopting AOP practices?
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值