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tests spring cloud loadbalancer
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‎README.md

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# Books Index
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- <a href="https://github.com/zacscoding/spring-boot-example/tree/master/book/start-spring-boot">start spring boot</a>
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- <a href="https://github.com/zacscoding/spring-boot-example/tree/master/book/spring-boot-inaction">spring boot in action (working)</a>
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- <a href="https://github.com/zacscoding/spring-boot-example/tree/master/book/spring-boot-inaction">spring boot in action (working)</a>
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# Lecture Index
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- <a href="book/jpashop">Jpa + Hibernate + Spring data jpa</a>
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- <a href="book/rest-api-demo">Spring boot rest api</a>
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# Example Index
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- <a href="springboot-graceful-shuwdown-demo">springboot-graceful-shuwdown-demo</a>
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; spring boot graceful shutdown about `TaskExecutor` bean, not bean and Tomecat's protocol handler `TaskExecutor`
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- <a href="springboot-cloud-loadbalancer-demo">springboot-cloud-loadbalancer-demo</a>
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; client side loadbalancer with spring cloud loadbalancer

‎springboot-cloud-loadbalancer-demo/.gitignore

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HELP.md
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.gradle
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build/
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!gradle/wrapper/gradle-wrapper.jar
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!**/src/main/**
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!**/src/test/**
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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out/
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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### VS Code ###
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.vscode/

‎springboot-cloud-loadbalancer-demo/README.md

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# Client loadbalancer with spring cloud
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; this is a demo project for client side loadbalancer with spring cloud
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from <a href="https://spring.io/guides/gs/spring-cloud-loadbalancer/">Spring getting started</a>
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## Getting started
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> Start server1,2,3
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```aidl
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// start server1
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$ ./gradlew bootRun -PjvmArgs="-Dserver.port=3000 -Dspring.profiles.active=server"
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// start server2
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$ ./gradlew bootRun -PjvmArgs="-Dserver.port=3001 -Dspring.profiles.active=server"
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// start server3
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$ ./gradlew bootRun -PjvmArgs="-Dserver.port=3002 -Dspring.profiles.active=server"
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```
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> Check server1,2,3
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```aidl
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$ curl -XGET http://localhost:3000/greeting
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$ curl -XGET http://localhost:3001/greeting
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$ curl -XGET http://localhost:3002/greeting
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```
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> Start client
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```aidl
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$ ./gradlew bootRun -PjvmArgs="-Dserver.port=8080 -Dspring.profiles.active=client"
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```
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> Request to client repeatedly
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```aidl
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$ curl -XGET http://127.0.0.1:8080/hello
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$ curl -XGET http://127.0.0.1:8080/hello
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$ curl -XGET http://127.0.0.1:8080/hello
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$ curl -XGET http://127.0.0.1:8080/hello
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```
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Then u can see server's log that received distributed requests.
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> Request with 6 times
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server1 -> server2 -> server3 -> server1 -> server2 -> server3
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```log
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// server1's log
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2020-01-03 00:12:56.837 INFO 12900 --- [nio-3000-exec-1] demo.server.ServerController : Access /greeting
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2020-01-03 00:13:00.876 INFO 12900 --- [nio-3000-exec-2] demo.server.ServerController : Access /greeting
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// server2's log
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2020-01-03 00:12:58.852 INFO 10304 --- [nio-3001-exec-1] demo.server.ServerController : Access /greeting
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2020-01-03 00:13:01.420 INFO 10304 --- [nio-3001-exec-3] demo.server.ServerController : Access /greeting
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// server3's log
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2020-01-03 00:12:59.640 INFO 16432 --- [nio-3002-exec-1] demo.server.ServerController : Access /greeting
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2020-01-03 00:13:01.957 INFO 16432 --- [nio-3002-exec-2] demo.server.ServerController : Access /greeting
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```
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‎springboot-cloud-loadbalancer-demo/build.gradle

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plugins {
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id 'org.springframework.boot' version '2.2.2.RELEASE'
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id 'io.spring.dependency-management' version '1.0.8.RELEASE'
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id 'java'
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}
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group = 'me.zaccoding'
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version = '0.0.1-SNAPSHOT'
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sourceCompatibility = '1.8'
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configurations {
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developmentOnly
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runtimeClasspath {
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extendsFrom developmentOnly
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}
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compileOnly {
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extendsFrom annotationProcessor
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}
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}
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repositories {
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mavenCentral()
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}
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ext {
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set('springCloudVersion', "Hoxton.SR1")
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}
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dependencies {
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implementation 'org.springframework.boot:spring-boot-starter-web'
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implementation 'org.springframework.boot:spring-boot-starter-webflux'
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implementation 'org.springframework.cloud:spring-cloud-starter-loadbalancer'
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compileOnly 'org.projectlombok:lombok'
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annotationProcessor 'org.projectlombok:lombok'
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testImplementation('org.springframework.boot:spring-boot-starter-test') {
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exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
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}
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}
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dependencyManagement {
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imports {
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mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
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}
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}
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test {
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useJUnitPlatform()
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}
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bootRun {
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// jvm options
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if (project.hasProperty('jvmArgs')) {
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jvmArgs project.jvmArgs.split('\\s+')
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}
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// arguments
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if (project.hasProperty('args')) {
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args project.args.split('\\s+')
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}
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}

‎springboot-cloud-loadbalancer-demo/gradle/wrapper/gradle-wrapper.jar

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‎springboot-cloud-loadbalancer-demo/gradle/wrapper/gradle-wrapper.properties

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#Thu Jan 02 23:12:16 KST 2020
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distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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zipStorePath=wrapper/dists
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zipStoreBase=GRADLE_USER_HOME

‎springboot-cloud-loadbalancer-demo/gradlew

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#!/usr/bin/env sh
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##############################################################################
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##
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## Gradle start up script for UN*X
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##
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##############################################################################
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# Attempt to set APP_HOME
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# Resolve links: $0 may be a link
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PRG="$0"
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# Need this for relative symlinks.
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while [ -h "$PRG" ] ; do
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ls=`ls -ld "$PRG"`
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link=`expr "$ls" : '.*-> \(.*\)$'`
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if expr "$link" : '/.*' > /dev/null; then
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PRG="$link"
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else
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PRG=`dirname "$PRG"`"/$link"
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fi
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done
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SAVED="`pwd`"
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cd "`dirname \"$PRG\"`/" >/dev/null
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APP_HOME="`pwd -P`"
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cd "$SAVED" >/dev/null
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APP_NAME="Gradle"
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APP_BASE_NAME=`basename "$0"`
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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DEFAULT_JVM_OPTS=""
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# Use the maximum available, or set MAX_FD != -1 to use that value.
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MAX_FD="maximum"
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warn () {
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echo "$*"
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}
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die () {
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echo
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echo "$*"
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echo
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exit 1
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}
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# OS specific support (must be 'true' or 'false').
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cygwin=false
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msys=false
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darwin=false
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nonstop=false
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case "`uname`" in
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CYGWIN* )
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cygwin=true
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;;
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Darwin* )
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darwin=true
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;;
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MINGW* )
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msys=true
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;;
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NONSTOP* )
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nonstop=true
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;;
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esac
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
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# Determine the Java command to use to start the JVM.
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if [ -n "$JAVA_HOME" ] ; then
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if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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if [ ! -x "$JAVACMD" ] ; then
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die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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else
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JAVACMD="java"
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which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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fi
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# Increase the maximum file descriptors if we can.
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if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
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MAX_FD_LIMIT=`ulimit -H -n`
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if [ $? -eq 0 ] ; then
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if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
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MAX_FD="$MAX_FD_LIMIT"
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fi
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ulimit -n $MAX_FD
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if [ $? -ne 0 ] ; then
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warn "Could not set maximum file descriptor limit: $MAX_FD"
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fi
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else
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warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
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fi
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fi
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# For Darwin, add options to specify how the application appears in the dock
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if $darwin; then
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GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
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fi
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# For Cygwin, switch paths to Windows format before running java
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if $cygwin ; then
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APP_HOME=`cygpath --path --mixed "$APP_HOME"`
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CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
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JAVACMD=`cygpath --unix "$JAVACMD"`
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# We build the pattern for arguments to be converted via cygpath
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ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
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SEP=""
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for dir in $ROOTDIRSRAW ; do
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ROOTDIRS="$ROOTDIRS$SEP$dir"
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SEP="|"
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done
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OURCYGPATTERN="(^($ROOTDIRS))"
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# Add a user-defined pattern to the cygpath arguments
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if [ "$GRADLE_CYGPATTERN" != "" ] ; then
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OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
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fi
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# Now convert the arguments - kludge to limit ourselves to /bin/sh
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i=0
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for arg in "$@" ; do
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CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
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CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
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if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
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eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
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else
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eval `echo args$i`="\"$arg\""
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fi
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i=$((i+1))
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done
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case $i in
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(0) set -- ;;
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(1) set -- "$args0" ;;
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(2) set -- "$args0" "$args1" ;;
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(3) set -- "$args0" "$args1" "$args2" ;;
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(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
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(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
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(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
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(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
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(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
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(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
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esac
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fi
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# Escape application args
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save () {
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for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
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echo " "
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}
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APP_ARGS=$(save "$@")
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# Collect all arguments for the java command, following the shell quoting and substitution rules
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eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
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# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
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if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
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cd "$(dirname "$0")"
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fi
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exec "$JAVACMD" "$@"

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