Application Architecture Patterns

Question 1

Patterns

Answer 1

Monolithic architecture

Microservice architecture

Question 2

Monolithic architecture: context

Answer 2

You are developing a server-side enterprise application.

server-side, different clients, api, integration, request-logic-database-response, multiple contexts

Question 3

Monolithic architecture: problem

Answer 3

What’s the application’s deployment architecture?

Question 4

Monolithic architecture: forces

Answer 4

• There is a team of developers working on the application
• New team members must quickly become productive
• The application must be easy to understand and modify
• You want to practice continuous deployment of the application
• You must run multiple instances of the application on multiple machines in order to satisfy scalability and availability requirements
• You want to take advantage of emerging technologies (frameworks, programming languages, etc)

Question 5

Monolithic architecture: solution

Answer 5

Build an application with a monolithic architecture. For example:

a single Java WAR file.
a single directory hierarchy of Rails or NodeJS code

Question 6

Monolithic architecture: example

Answer 6

Browser
Apache
Tomcat (WAR)
Mysql Database

Question 7

Monolithic architecture: result benefits

Answer 7

Simple to develop, deploy, scale

Question 8

Monolithic architecture: result drawbacks

Answer 8

intimidates developers,
Overloaded IDE,
Overloaded web container,
Continuous deployment is difficult,
Scaling the application can be difficult,
Requires a long-term commitment to a technology stack

Question 9

Monolithic architecture: related patterns

Answer 9

microservice architecture

is an alternative pattern that addresses the limitations of the monolithic architecture.

Question 10

Microservice architecture: context

Answer 10

You are developing a server-side enterprise application.
server-side, different clients, api, integration by messaging or rpc, request-logic-database-message-response, multiple contexts

Question 11

Microservice architecture: problem

Answer 11

What’s the application’s deployment architecture?

Question 12

Microservice architecture: solution

Answer 12

Define an architecture that structures the application as a set of loosely coupled, collaborating services
    *   Y-axis scale cube
Highly maintanable and testable
Loosely coupled with other services
Independently deployable
Capable of being developed by a small team
Communication can be synch or asynch
Private database
Data consistency by saga pattern

Question 13

Microservice architecture: example

Answer 13

client -> api gateway or web front -> services -> their databases

Question 14

Microservice architecture: result benefits

Answer 14

Improved maintainability 
Better testability
Better deployability
autonomous teams
Easier for a developer to understand
The IDE is faster making developers
The application starts faster
Improved fault isolation
Eliminates any long-term commitment to a technology stack

Question 15

Microservice architecture: result drawbacks

Answer 15

additional complexity to developers
Deployment complexity
Increased memory consumption

Question 16

Microservice architecture: issues

Answer 16

When to use the microservice architecture?
How to decompose the application into services?
How to maintain data consistency?
How to implement queries?