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In Mahindra folder, a microservice named 'Mahindra-App' is there. Similarly, in Honda folder, a microservice named 'Honda-App' is there. Mahindra-App returns the information of all the products of Mahindra with different category(eg., Bike, Car, etc). And Honda-App returns the information of all the products of Honda with different category. These microservices return the data in JSON format.
These datas are received by another microservice Store-App which in the folder Store. These datas are then processed and passed to a JSP page. In JSP page, using JSTL taglibs data is presented.
To resolve urls of Mahindra-App and Honda-App inside Store-App, discovery service is used. Here, Eureka (one of the technology Spring-Cloud integrates with) is used as a Discovery Service. It is a Client-Side-Discovery-Service.
When all the microservices and Eureka server will run then these microservices(Eureka client) register themselves with the Eureka server.
Note:- Eureka server is also a Eureka client and it also register itself on the server. This is important because when we will be having multiple instances of Eureka server running then it is important for all Eureka servers to register themselves with each other so that even when one of the server fails, other instances of the server will provide the discovery service.
Eureka client updates its registration in every few seconds so that any change in Eureka client is immediately reflected on Eureka server.
When Eureka client shuts down or timeout happens then it is deregistered from Eureka server. At this time Eureka server does not have any information about the microservice.
When Store-App wants to communicate with Honda-App then it sends a GET request to the Discovery service. Inside Discovery service querying happens and then it send the response back to the Store-App. Now Store-App has the information required to communicate with Honda-App. And then actual communication takes place.
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