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

RabbitMQ - How to setup and Test from Mule 3.9

• Install RabbitMQ
  • Step 1: Install Erlang
  • Step 2: Install RabbitMQ
• Enable RabbitMQ Web Console
  • RabbitMQ Login Page
  • RabbitMQ Overview Page
  • Start RabbitMQ Service in Windows
• Setting up Mule
  • Create New Mule App and Design Flow
  • Add AMQP-0-9 Connector Global Element
  • Create A Queue in RabbitMQ
  • Create A Virtual Host in RabbitMQ
• Test RabbitMQ From Mule
  • Publish a message in RabbitMQ
  • Test the mule-3.9 app
  • RabbitMQ Test Project in Mule-3.9

Install RabbitMQ

Here is the quick installation guideline for Ubuntu 18.04

Step 1: Install Erlang

RabbitMQ needs Erlang to run. To install the latest version of Erlang, add the repository below

sudo sh -c 'echo "deb https://packages.erlang-solutions.com/ubuntu $(lsb_release -sc) contrib" >> /etc/apt/sources.list.d/erlang.list'

wget https://packages.erlang-solutions.com/ubuntu/erlang_solutions.asc sudo apt-key add erlang_solutions.asc

sudo apt update sudo apt install erlang

Step 2: Install RabbitMQ

Add RabbitMQ Repository, Add Repository Key, Install RabbitMQ and Enable on Startup. 

sudo sh -c 'echo "deb https://dl.bintray.com/rabbitmq/debian $(lsb_release -sc) main" >> /etc/apt/sources.list.d/rabbitmq.list'

wget -O- https://dl.bintray.com/rabbitmq/Keys/rabbitmq-release-signing-key.asc | sudo apt-key add - wget -O- https://www.rabbitmq.com/rabbitmq-release-signing-key.asc | sudo apt-key add -

sudo apt update sudo apt install rabbitmq-server

sudo systemctl enable rabbitmq-server sudo systemctl start rabbitmq-server

For other Operating Systems please see the links below:

Installing on Windows

Intalling on MAC

Enable RabbitMQ Web Console

RabbitMQ provides a web console to manage it easily. To enable the console, run the commands below

sudo rabbitmq-plugins enable rabbitmq_management

After that, open your browser and browse to the server name or IP address followed by port # 15672

Example:  http://localhost:15672

You should see RabbitMQ web management console to logon. The default username and password is guest.

Username: guest

Password:  guest

RabbitMQ Login Page

RabbitMQ Overview Page

Start RabbitMQ Service in Windows

In windows system the RabbitMQ Service starts automatically. If not then you need to start it manually after installation

as like the image below. Then enable RabbitMQ Management console as shown in the following CLI.

Setting up Mule

Now open AnypointStudio and enter the AnyPointStudio Exchange Login Page.

Login and install AMQP connector mule component. 

Create New Mule App and Design Flow

Now create a new Mule project and add the following components to Mule flow:

Add AMQP-0-9 Connector Global Element

Add a AMQP-0-9 Connector Global Element to the mule flow with following properties

Create A Queue in RabbitMQ

Logon to RabbitMQ Web-console with guest user and create a queue with name "queue" 

Create A Virtual Host in RabbitMQ

Create a vhost with name "/test"

Set up logger log message and run the project.

Test RabbitMQ From Mule

Publish a message in RabbitMQ

Now publish a message in the queue named queue 

Test the mule-3.9 app

Check mule console log to check the output

RabbitMQ Test Project in Mule-3.9

For your convenience the sample mule-3.9 project has been attached below

RabbitMQ Test App using Mule-3.9	rabbitmqtestapp.zip