"Welcome To Ashok IT"				
			                    "Spring Boot and MicroServices"
                                             Topic : MicroServices
                                             Date  : 26/09/2023
                                                (Session - 104)                               
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Last Session
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* We have completed working with RestClient Development using various techniques

     1) HttpClient

     2) RestTemplate

     3) WebClient

     4) FeignClient (Microservices)


Today Session
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Introduction To MicroServices
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1) What is Monolithic Architecture?

2) Examples on Monolithic Architecture Based Applications?

3) Advantages of Monolithic Architecture

4) Disadvantages of Monolithic Architecture


Introduction
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* Project means Collection of different Modules.

* Inorder to develop the project traditional we need to following software development model i.e.,Monolithic          Architecture/Monolithic Application.

* A Monolithic Application is built as a single unit. 

* All functionailities of a project exists in a single code base/Single WAR File, then that application known as   monolithic     Application.

Example : Banking Application
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* Banking Application contains several Modules

   1) customer Module :::::: Maintaining the Customer Related Informations

   2) Payment Module  :::::: Maintaining the Customer Payments Related Information

   3) Balance Module  :::::: Maintaining the Customer Related Balance Information

   4) Insurance Module ::::: Maintaining the Customer Related Insurance Information

   5) Transaction Module:::: Maintaining the Customer related Transaction Information

   6) Security Module :::::: Authentication & Authorization 

   7) Loans Module  :::::::: Maintaining the Customer Related loans information


Advantages of Monolithic Application
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1) Simple For develop 
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* At the beginning of a project it is much easier to got with Monolithic Architecture.

2) Simple to Test
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* You can implement end-to-end testing by simply launching the application and testing application through UI (or) testing     application through selenium.

3) Simple to Deploy
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* One War file only we have to deploy.

4) Easy for Scaling
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*  Simple to scale horizontally by running multiple copies of an application using Load Balancer.

Disadvantages of Monolithic Application
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1) Maintenance
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  * If Application is too large and complex to understand entirely, It is challenging to make changes fast and correctly.
  
2) The size of application is rapidly increasing will become slow down the start-up time.

3) For any kind of small change happened in particular module definetly we must deploy the entire application.

4) If there is bug in one module,then it leads to entire application will go down.

5) Monolithic application having some difficulty to adopt and adhere new and advanced technologies.

6) Monolithic application development quick releases are not possible.

Microservices 
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* Microservices is not a technology

* Microservices is not a framework

* Microservices is not an API

* Microservices is an Architetural Design Pattern.

* Microservices design pattern came into market to avoid the problems of Monolithic Architecture.

* The Main aim of Microservices architecture is "Divide & Conqure" Model.'


Advantages of Microservices
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1) Easy Maintanience
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* As we are dividing our project functionality into multiple microservices it is easy to maintain.

2) Faster Releases
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* As we are developing limited functionality very quickly we can complete development and testing immediately and we can     release quickly our microservices.

3) Parallel Development
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 * Multiple teams can work on multiple micro services development parallely.

4) Adopting the new technology
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 * There is no rule saying that all microservices should be implemented using same programming language.

 * We can use different technologies for developing microservices

5) Easy Scaling
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 * We can sale our microservices based projects easily.
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