Decompose By Subdomain Pattern Tutorial for Software Developers | Microservices Patterns

In this video we will learn about Decompose by Subdomain design principle. This is the second design principle in Decomposition design principles category for microservices.

Monolith application can be decomposed using domain driven design approach. There are some Prerequisite of decomposition of microservices. Domain driven design refers the business as the domain and a domain is consists of multiple subdomains.

1. Services must be cohesive. A service should implement a small set of strongly related functions.
2. Services must be loosely coupled i.e., each service as an API that encapsulates its implementation.

Subdomains can be classified as follows:
1. Core - key differentiator for the business and the most valuable part of the application
2. Supporting - related to what the business does but not a differentiator. These can be implemented in-house or outsourced.
3. Generic - not specific to the business and are ideally implemented using off the shelf software.

A complex domain may contain multiple subdomains and some of the subdomains can combine and grouping with each other for common rules and responsibilities. So, the group of sub domains are called as Bounded Contexts. In order to identify subdomains or bounded contexts, we should use domain driven design.

Lets see an example of an ecommerce application. Followings are some subdomains in this application.
• Product catalog
• Inventory management
• Order management
• Delivery management

** Usage of this Design Pattern **
1. Use this pattern whenever you want to break monolithic application to microservices.
2. Use this pattern if domain has multiple subdomains.
3. Use this pattern if there is bounded context across multiple domains.
4. Use this pattern to create cohesive, stable and loosely coupled microservices.

** Advantages of Microservices **
1. Stable Architecture − As business subdomains are stable, this architecture is highly stable.
2. Cross-functional Teams − Development Teams works independently, are cross-functional and are organized around functional features instead of technical features.
3. Loosely Coupled Services − Developed services will be loosely coupled and cohesive.
4. This principle offers loosely coupled architecture, scalability, resilience, maintainability, extensibility, location transparency, protocol independence, and time independence.

** Chapter Timestamps **
0:00 Welcome to Decompose by Subdomain design patterns
0:54 Agenda of tutorial
1:44 Introduction of Decompose by Subdomain design patterns
4:00 Real world examples of Decompose by Subdomain design patterns
5:52 Usage of Decompose by Subdomain design patterns
6:20 Advantages of Decompose by Subdomain design patterns
6:48 Summary of Decompose by Subdomain design patterns
7:20 Next video on Decompose by Transactions design patterns

#microservicedesignpatterns #decomposebysubdomain #microservice

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