Repository for training purpose due "emirates.com cross skilled training sessions" 2019

This repository contains Netflix OSS stack, microservice examples

• application yml/properties to be loaded from configuration server
• gateway service is entry point (API PROXI)
• load balanced communications between services will happened though gateway
• services use functional approach, spring-cloud-function to expose endpoints
• extended example use reactive stack + ui in imperative, small example fully reactive

1 day (service discovery)

run your installed apps as follows

java -jar demo-cloud-mesh/sd/target/mesh-server-0.0.1-SNAPSHOT.jar
java -jar demo-cloud-mesh/ms1/target/serverless-1.0-SNAPSHOT.jar --server.port=8081 
java -jar demo-cloud-mesh/ms1/target/serverless-1.0-SNAPSHOT.jar --server.port=8082

open in browser http://localhost:8761/
you have to find details as follows

Instances currently registered with Eureka
Application	AMIs	Availability Zones	Status
SERVERLESS-EXAMPLE	n/a (2)	(2)	UP (2) - 
NB3021821768.corp.emirates.com:serverless-example:8082 , 
NB3021821768.corp.emirates.com:serverless-example:8081

2 day (gateway server)

open in browser http://localhost:8761/
find 3 instances (2 of microservice1, 1 of gateway)
get direct access to microservice1
http://localhost:8081/hello
http://localhost:8081/hello,uppercase

have same result getting access to microservice1 though GATEWAY
http://localhost:8080/SERVERLESS-EXAMPLE/hello
http://localhost:8080/SERVERLESS-EXAMPLE/hello,uppercase

read https://www.baeldung.com/spring-cloud-gateway

day 3 (configuration server)

properties from classpath

start SERVERLESS-EXAMPLE, open http://localhost:8081/config
find response local properties has been used

properties from configuration server

start CONFIGURATION-SERVER using command line arguments
--spring.cloud.config.server.git.username=username --spring.cloud.config.server.git.password=password to get access to git under your creds

get access to config server content being stored, open http://localhost:7777/serverless-example/default
find response {"name":"serverless-example","profiles":["default"],"label":null,"version":"a6f20a7f6559e46fdc03a4114d9775030d2e3b7a","state":null,"propertySources":[{"name":"https://github.com/mikesockor/demo-cloud-mesh/cp/serverless-example.properties","source":{"info.foo":"GITHUB properties has been used, that is great by the way"}}]}

get access to properties injected to microservice from config server, open http://localhost:8081/config
find response GITHUB properties has been used, that is great by the way

read https://cloud.spring.io/spring-cloud-config/multi/multi_spring-cloud-config.html

day 4 (service-to-service communication)

run all OSS services (config-server, gateway-server, service-discovery)

small example

run all small services (microservice, ui), get access to
http://localhost:8080/ui-example/helloClient
http://localhost:8080/ui-example/helloBuilder
http://localhost:8080/ui-example/wordsClient
http://localhost:8080/ui-example/profilesClient

function composition in UI level
http://localhost:8086/wordsClient,uppercase

function composition in downstream service level
http://localhost:8080/fullProfilesClient

communication will happen as follows
browser -> gateway -> service-discovery -> ui-service -> service-discovery -> gateway -> service-discovery -> small-microservice-example

extended example

run all extended services (sale, airport, flight, ui), get access to
http://localhost:8080/ make search from MIA to JAX, play with dates