Git: How to remove and Ignore DS_Store file

 When you work with Git  in a Mac. You might notice  .DS_Store file is added to your git commit unintentionally. 

Remove .DS_Store File 

If the  DS_Store File already added to your git report. first remove the file.

find . -name "*.DS_Store" -type f -delete

https://askubuntu.com/questions/377438/how-can-i-recursively-delete-all-files-of-a-specific-extension-in-the-current-di

Ignore .DS_Store File in your git commit
echo .DS_Store >> ~/.gitignore_global
And let git know that you want to use this file for all of your repositories:
git config --global core.excludesfile ~/.gitignore_global

Find Details here : git ignore

Install Maven on MacOS Catalina

 There might be many ways to install Maven on mac but I found the best way to install maven on mac is to using homebrew:

Step1:  install homebrews (if you don't have already)

Follow this URL : how-to-install-homebrew-on-mac

Step 2 : Install Maven:

https://mkyong.com/maven/install-maven-on-mac-osx/

Extra tips.

Where I can find maven local repository:

>> ~/.m2

What are Design Fundamentals?

 Building scalable, production-ready applications is both art and science.

Design Fundamentals comes in a lot of different flavours. Specifically they can be divided in to four categories. Categories that are equally important.

First Category 

Underlying or Foundational Knowledges . 

• For Example: 
• Client Server Model
• Network Protocol

Software Architectural Pattern

• Microkernel Pattern
• Microservices Pattern 
• Layered Architecture Pattern
• Event-based Pattern
• Space-based Pattern
• https://dzone.com/articles/5-major-software-architecture-patterns
• https://herbertograca.com/2017/07/28/architectural-styles-vs-architectural-patterns-vs-design-patterns/

Second Category

Key Characteristics of systems

• Availability 
• Latency,
• Throughput 
• Redundancy,
• consistency 

Third Category

Actual Component of a system

Example: 

• Load Balancer 
• Proxy
• Cache
• Rate limiting
• leader election

Forth Category:

Actual Tech, Real existing product or services

Example: 

• Zoo Keeper
• Nginx
• Redis
• Amazon S3
• Google Cloud Storage

Tech lead Or Engineering Manager

https://medium.com/inside-plato/plato-event-3-part-1-5-tech-lead-and-engineering-manager-which-way-to-choose-69987fbdfb83

How Computer works

How Computer Works

How Computer Executes a Program

How Data is transmitted over the cable 

How Does Internet Works

How to return static content from nginx

     

Some times you might need to return static response from nginx. for example validating file upload limit

  error_page 413 @413_xml;
  location @413_xml {
            default_type "text/xml; charset=UTF-8";
            return 413 '<?xml version="1.0" encoding="UTF-8"?><result><status><interfaceId>cabinet.file.insert</interfaceId><systemStatus>NG</systemStatus><message>Image size Error(Capacity)</message><requestId>$request_id</requestId><requests/></status><cabinetFileInsertResult><resultCode>3008</resultCode></cabinetFileInsertResult></result>';
        }

Spring : Aspect-Oriented Programming

AOP is the acronym for aspect-oriented programming, which refers to a type of programming that aims to increase modularity by allowing the separation of cross-cutting concerns. A cross-cutting concern is a functionality that is tangled with business code, which usually cannot be separated from the business logic. Auditing, security, and transaction management are good examples of cross-cutting concerns.

The following are other features that might be implemented as cross-cutting concerns.

• Logging
• Data validation
• Caching
• Internationalization1
• Error detection and correction
• Memory management
• Performance monitoring
• Synchronization