This application implements an Event mechanism usable in Microservice environments.

* a publisher publishes events with one of these topics

* customer.created

* customer.edited

* customer.deleted

* order.created

* order.edited

* order.deleted

* invoice.created

* invoice.edited

* invoice.deleted

* a subscriber subscribes to events of a specific topic from

a queue specific to its (micro-)service


1. [Install RabbitMQ](https://www.rabbitmq.com/download.html) (if it's installed on another

host than localhost then you need to change the connection properties in `application.properties`)

1. start a couple instances of the demo application in `subscriber` mode, for example:

* ./gradlew bootrun -Dspring.profiles.active=subscriber -Dsubscriber.queue=service1Queue -Dsubscriber.routingKey=customer.*

* ./gradlew bootrun -Dspring.profiles.active=subscriber -Dsubscriber.queue=service2Queue -Dsubscriber.routingKey=.*created

* ./gradlew bootrun -Dspring.profiles.active=subscriber -Dsubscriber.queue=service3Queue -Dsubscriber.routingKey=\*.\*

1. start a single instance of the demo application in `publisher` mode:

* ./gradlew bootrun -Dspring.profiles.active=publisher

1. check the log output of the publisher and the subscribes to see which events are produced and which events

are consumed by each subscriber

buildscript {

ext {

springBootVersion = '1.5.4.RELEASE'

}

repositories {

mavenCentral()

}

dependencies {

classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")

}

}

apply plugin: 'java'

apply plugin: 'eclipse'

apply plugin: 'org.springframework.boot'

version = '0.0.1-SNAPSHOT'

sourceCompatibility = 1.8

repositories {

mavenLocal()

mavenCentral()

}

ext {

springCloudVersion = 'Dalston.SR2'

}

dependencies {

compile('org.springframework.boot:spring-boot-starter-amqp')

testCompile('org.springframework.boot:spring-boot-starter-test')

}

bootRun{

systemProperties = System.properties

}

distributionBase=GRADLE_USER_HOME

distributionPath=wrapper/dists

zipStoreBase=GRADLE_USER_HOME

zipStorePath=wrapper/dists

distributionUrl=https\://services.gradle.org/distributions/gradle-3.5.1-bin.zip