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Decomposition Design Pattern

Anjali Sharma answered on January 3, 2023 Popularity 3/10 Helpfulness 1/10

answer Decomposition Design Pattern

Decomposition Design Pattern

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Microservices are developed with an idea on developers mind to create small services, with each having their own functionality.
But, breaking an application into small autonomous units has to be done logically. 
So, to decompose a small or big application into small services, you can use the Decomposition patterns.
With the help of this pattern, either you can decompose an application based on business capability or on based on the sub-domains. 
For example, if you consider an e-commerce application, then you can have separate services for orders, payment, customers, products if you decompose by business capability.
But, in the same scenario, if you design the application by decomposing the sub-domains, then you can have services for each and every class. Here, in this example, if you consider the customer as a class, then this class will be used in customer management, customer support, etc. So, to decompose, you can use the Domain-Driven Design through which the whole domain model is broken down into sub-domains. Then, each of these sub-domains will have their own specific model and scope(bounded context).  Now, when a developer designs microservices, he/she will design those services around the scope or bounded context.
Though these patterns may sound feasible to you, they are not feasible for big monolithic applications. 
This is because of the fact that identifying sub-domains and business capabilities is not an easy task for big applications. 
So, the only way to decompose big monolithic applications is by following the Vine Pattern or the Strangler Pattern.

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Contributed on Jan 03 2023

Anjali Sharma

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