Chapter 3 Design using microservices and monolithic architecture as shown in Figure 3-15. Microservices are lightweight services running as a separate process; each service inculcates a separate business capability in it. The advantages of microservices over monolithic applications are as follows: • Services communicate using REST. • Services are loosely coupled. • Scaling is easier. • You can achieve isolation of services: if one service fails, another would continue. You can build these microservices using containerization and orchestrate using Kubernetes. The advantages of microservices build using Kubernetes and containers are as follows: • Number of services can be deployed and delivered quickly. • Services built on Kubernetes can be deployed across different environments. Test environments like SIT, UAT, or preproduction can be cheaply and quickly created with a Kubernetes cluster. Steps to design the integration layer are as follows: 1. Select the appropriate architecture type such as microservices or monolithic services architecture. 2. Select the appropriate messaging pattern for the business process to be integrated. 3. Select the appropriate framework that satisfies the business needs; for example: • Apache camel can be used as mini-ESB for large scale applications. • Apache CXF can be used as service framework for medium scale applications. • Spring Boot along with Apache camel can be used for microservices. 83