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--- programming:spring [2024/07/13 19:25] – [Ribbon Client based load balancer] skipidar
+++ programming:spring [2024/07/14 19:36] (current) – [Docker] skipidar
@@ Line 255: / Line 255: @@
 ==== Feign - declarative REST client ====
+Reduces the glue-code to the minimum.
+Need only to express - what to call and receive the response DTO
 https://cloud.spring.io/spring-cloud-netflix/multi/multi_spring-cloud-feign.html
-{{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/NpUdMEEAR7.png}}
+<sxh java>
+package com.in28minutes.microservices.currencyconversionservice;
+import org.springframework.cloud.netflix.feign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+@FeignClient(name = "currency-exchange-service", url = "localhost:8000")
+public interface CurrencyExchangeServiceProxy {
+    @GetMapping("/currency-exchange/from/{from}/to/{to}")
+    public CurrencyConversionBean retrieveExchangeValue
+            (@PathVariable("from") String from, @PathVariable("to") String to);
+}
+</sxh>
 ==== Ribbon - Client based load balancer ====
+Exposes multiple deployments under one URL
+{{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/K9ELIqz2Uf.png}}
 {{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/Od4LgsV7Ij.png}}
+==== Zuul API Gateway ====
+API Gateway in SPring
+==== EUreka Namingserver ====
+Allows to register / discover services on a naming server.
+Has a GUI to list available services.
+{{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/qVkyO04yvD.png}}
+==== Cloud Sleuth - unique tracing id to requests ====
+adds a unique tracing id to requests
+==== Zipkin - Distributed Tracing Server ====
+Central tracing server.
+  * Like ELK.
+  * and CloudWatch
+{{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/ce868zFAte.png}}
+{{https://s3.eu-central-1.amazonaws.com/alf-digital-wiki-pics/sharex/EG0bVz0lrr.png}}
+==== Spring Cloud Bus  ====
+Can use it to refresh the configs of all services,
+by sending a message via the bus.
+=====  Docker =====
+== Build manually without gradle ==
+<sxh java>
+docker build --build-arg JAR_FILE=build/libs/\*.jar -t springio/demo-consume-api -f src/main/docker/Dockerfile  .
+</sxh>
+== Build with Gradle ==
+You can build a tagged docker image with Gradle in one command:
+<sxh java>
+sudo su
+./gradlew bootBuildImage --imageName=springio/demo-consume-api
+sudo docker images
+</sxh>
+== And run ==
+<sxh java>
+sudo docker run -p 8080:8080 springio/demo-consume-api
+</sxh>