merged with upstream/wip-customer

This commit is contained in:
dartpopikyardo
2016-09-20 04:01:01 +03:00
13 changed files with 281 additions and 148 deletions

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@@ -1,7 +1,7 @@
#Event-Sourcing+CQRS example application
This example application is the money transfer application described in my talk [Building and deploying microservices with event sourcing, CQRS and Docker](http://plainoldobjects.com/presentations/building-and-deploying-microservices-with-event-sourcing-cqrs-and-docker/).
This talk describe a way of architecting highly scalable and available applications that is based on microservices, polyglot persistence,
This talk describes a way of architecting highly scalable and available applications that is based on microservices, polyglot persistence,
event sourcing (ES) and command query responsibility segregation (CQRS).
Applications consist of loosely coupled components that communicate using events.
These components can be deployed either as separate services or packaged as a monolithic application for simplified development and testing.
@@ -94,9 +94,12 @@ First, you need to tell the query side code how to connect to MongoDB:
```
[Docker Compose](https://docs.docker.com/compose/) is a great way to run MongoDB.
You can run the `docker-compose up -d mongodb` to run MongoDB.
You can run the `docker-compose up -d mongodb` to run MongoDB and then set `SPRING_DATA_MONGODB_URI` as follows:
```
export SPRING_DATA_MONGODB_URI=mongodb://$(docker-machine ip default)/yourdb
```
Second, some of the tests in accounts-command-side-service, transactions-command-side-service, accounts-query-side-service and e2e-test need you need to set some environment variables that tell them how to connect to the Event Store server.
Second, some of the tests in accounts-command-side-service, transactions-command-side-service, accounts-query-side-service and e2e-test require you to set some environment variables that tell them how to connect to the Event Store server.
But don't worry.
The build is configured to ignore failures for those projects.
@@ -117,6 +120,15 @@ Simply use this command:
java -jar monolithic-service/build/libs/monolithic-service.jar
```
This will start the service running on port 8080 (you can change using the --server.port=9999 option).
Once the service has started you can open the Swagger UI: http://localhost:8080/swagger-ui.html.
You can then:
1. Create two accounts (save the account ids)
2. Create a money transfer
3. View the updated account balances
## Running the microservices
The other option is to run the services separately.

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@@ -26,7 +26,7 @@ if [ "$1" = "--no-rm" ] ; then
shift
fi
${DOCKER_COMPOSE?} up -d mongodb
${DOCKER_COMPOSE?} up -d mongodb $EXTRA_INFRASTRUCTURE_SERVICES
if [ -z "$DOCKER_HOST_IP" ] ; then
if which docker-machine >/dev/null; then

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@@ -7,19 +7,19 @@ This application consists of three microservices:
* Account Service - the command side business logic for Accounts
* Money Transfer Service - the command side business logic for Money Transfers
* Query service - query side implementation of a MongoDB-based, denormalized view of Accounts and MoneyTransfers
The Account Service consists of the following modules:
* accounts-command-side-backend - the Account aggregate
* accounts-command-side-web - a REST API for creating and retrieving Accounts
* accounts-command-side-service - a standalone microservice
The Money Transfer Service consists of the following modules:
* transactions-command-side-backend - the MoneyTransfer aggregate
* transactions-command-side-web - a REST API for creating and retrieving Money Transfers
* transactions-command-side-service - a standalone microservice
The Query Service consists the following modules:
* accounts-query-side-backend - MongoDB-based, denormalized view of Accounts and MoneyTransfers
@@ -28,10 +28,8 @@ The Query Service consists the following modules:
# Deploying the application
These services can be deployed either as either separate standalone services using the Event Store server, or they can be deployed as a monolithic application for simpified integration testing.
These services can be deployed either as either separate standalone services using the Event Store server, or they can be deployed as a monolithic application for simplified integration testing.
The three services can also be packaged as a single monolithic web application in order to be used with the embedded Event Store:
* monolithic-service - all-in-one, monolithic packaging of the application

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@@ -0,0 +1,4 @@
#! /bin/bash
export EXTRA_INFRASTRUCTURE_SERVICES=cdcservice
../_build-and-test-all.sh -f docker-compose-eventuate-local.yml -P eventuateLocal=1 $*

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@@ -0,0 +1,48 @@
apigateway:
image: java:openjdk-8u91-jdk
command: java -jar /app/api-gateway-service.jar --accounts.commandside.service.host=accountscommandside --transfers.commandside.service.host=transactionscommandside --accounts.queryside.service.host=accountsqueryside --customers.commandside.service.host=customerscommandside --customers.queryside.service.host=customersqueryside
environment:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
ports:
- "8080:8080"
accountscommandside:
image: java:openjdk-8u91-jdk
command: java -jar /app/accounts-command-side-service.jar
ports:
- "8085:8080"
transactionscommandside:
image: java:openjdk-8u91-jdk
command: java -jar /app/transactions-command-side-service.jar
ports:
- "8082:8080"
accountsqueryside:
image: java:openjdk-8u91-jdk
command: java -jar /app/accounts-query-side-service.jar
environment:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
ports:
- "8081:8080"
customerscommandside:
image: java:openjdk-8u91-jdk
command: java -jar /app/customers-command-side-service.jar
ports:
- "8083:8080"
customersqueryside:
image: java:openjdk-8u91-jdk
command: java -jar /app/customers-query-side-service.jar
ports:
- "8084:8080"
environment:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
mongodb:
image: mongo:3.0.4
hostname: mongodb
command: mongod --smallfiles
ports:
- "27017:27017"

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@@ -1,11 +1,61 @@
zookeeper:
image: eventuateio/eventuateio-local-zookeeper:0.6.0
ports:
- 2181:2181
- 2888:2888
- 3888:3888
kafka:
image: eventuateio/eventuateio-local-kafka:0.6.0
ports:
- 9092:9092
links:
- zookeeper
environment:
- ADVERTISED_HOST_NAME=${DOCKER_HOST_IP}
- KAFKA_HEAP_OPTS=-Xmx320m -Xms320m
- ZOOKEEPER_SERVERS=zookeeper:2181
mysql:
image: eventuateio/eventuateio-local-mysql:0.6.0
ports:
- 3306:3306
environment:
- MYSQL_ROOT_PASSWORD=rootpassword
- MYSQL_USER=mysqluser
- MYSQL_PASSWORD=mysqlpw
cdcservice:
image: eventuateio/eventuateio-local-cdc-service:0.6.0
ports:
- "8099:8080"
links:
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword
mongodb:
extends:
file: docker-compose-common.yml
service: mongodb
apigateway:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: apigateway
volumes:
- ./api-gateway-service/build/libs:/app
command: java -jar /app/api-gateway-service.jar --accounts.commandside.service.host=accountscommandside --transfers.commandside.service.host=transactionscommandside --accounts.queryside.service.host=accountsqueryside --customers.commandside.service.host=customerscommandside --customers.queryside.service.host=customersqueryside
ports:
- "8080:8080"
links:
- accountscommandside
- transactionscommandside
@@ -13,117 +63,126 @@ apigateway:
- customerscommandside
- customersqueryside
- mongodb
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL:
SPRING_DATASOURCE_USERNAME:
SPRING_DATASOURCE_PASSWORD:
SPRING_DATASOURCE_DRIVER_CLASS_NAME:
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS:
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
EVENTUATELOCAL_EMBEDDED_CDC_DB_USER_NAME:
EVENTUATELOCAL_EMBEDDED_CDC_DB_PASSWORD:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword
accountscommandside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: accountscommandside
volumes:
- ./accounts-command-side-service/build/libs:/app
command: java -jar /app/accounts-command-side-service.jar
ports:
- "8085:8080"
links:
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL:
SPRING_DATASOURCE_USERNAME:
SPRING_DATASOURCE_PASSWORD:
SPRING_DATASOURCE_DRIVER_CLASS_NAME:
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS:
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING:
EVENTUATELOCAL_EMBEDDED_CDC_DB_USER_NAME:
EVENTUATELOCAL_EMBEDDED_CDC_DB_PASSWORD:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword
transactionscommandside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: transactionscommandside
volumes:
- ./transactions-command-side-service/build/libs:/app
command: java -jar /app/transactions-command-side-service.jar
ports:
- "8082:8080"
links:
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL:
SPRING_DATASOURCE_USERNAME:
SPRING_DATASOURCE_PASSWORD:
SPRING_DATASOURCE_DRIVER_CLASS_NAME:
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS:
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING:
EVENTUATELOCAL_EMBEDDED_CDC_DB_USER_NAME:
EVENTUATELOCAL_EMBEDDED_CDC_DB_PASSWORD:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword
accountsqueryside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: accountsqueryside
volumes:
- ./accounts-query-side-service/build/libs:/app
command: java -jar /app/accounts-query-side-service.jar
ports:
- "8081:8080"
links:
- mongodb
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL:
SPRING_DATASOURCE_USERNAME:
SPRING_DATASOURCE_PASSWORD:
SPRING_DATASOURCE_DRIVER_CLASS_NAME:
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING:
EVENTUATELOCAL_EMBEDDED_CDC_DB_USER_NAME:
EVENTUATELOCAL_EMBEDDED_CDC_DB_PASSWORD:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword
customerscommandside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: customerscommandside
volumes:
- ./customers-command-side-service/build/libs:/app
command: java -jar /app/customers-command-side-service.jar
ports:
- "8083:8080"
links:
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL:
SPRING_DATASOURCE_USERNAME:
SPRING_DATASOURCE_PASSWORD:
SPRING_DATASOURCE_DRIVER_CLASS_NAME:
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS:
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING:
EVENTUATELOCAL_EMBEDDED_CDC_DB_USER_NAME:
EVENTUATELOCAL_EMBEDDED_CDC_DB_PASSWORD:
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword
customersqueryside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: customersqueryside
volumes:
- ./customers-query-side-service/build/libs:/app
command: java -jar /app/customers-query-side-service.jar
ports:
- "8084:8080"
links:
- mongodb
- mysql
- kafka
- zookeeper
environment:
SPRING_DATASOURCE_URL:
SPRING_DATASOURCE_USERNAME:
SPRING_DATASOURCE_PASSWORD:
SPRING_DATASOURCE_DRIVER_CLASS_NAME:
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS:
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
EVENTUATELOCAL_EMBEDDED_CDC_DB_USER_NAME:
EVENTUATELOCAL_EMBEDDED_CDC_DB_PASSWORD:
mongodb:
image: mongo:3.0.4
hostname: mongodb
command: mongod --smallfiles
ports:
- "27017:27017"
environment:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
SPRING_DATASOURCE_URL: jdbc:mysql://mysql/eventuate
SPRING_DATASOURCE_USERNAME: mysqluser
SPRING_DATASOURCE_PASSWORD: mysqlpw
SPRING_DATASOURCE_DRIVER_CLASS_NAME: com.mysql.jdbc.Driver
EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS: kafka:9092
EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING: zookeeper:2181
EVENTUATELOCAL_CDC_DB_USER_NAME: root
EVENTUATELOCAL_CDC_DB_PASSWORD: rootpassword

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@@ -1,11 +1,9 @@
apigateway:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: apigateway
volumes:
- ./api-gateway-service/build/libs:/app
command: java ${JAVA_OPTS} -jar /app/api-gateway-service.jar --accounts.commandside.service.host=accountscommandside --transfers.commandside.service.host=transactionscommandside --accounts.queryside.service.host=accountsqueryside --customers.commandside.service.host=customerscommandside --customers.queryside.service.host=customersqueryside
ports:
- "8080:8080"
links:
- accountscommandside
- transactionscommandside
@@ -14,80 +12,66 @@ apigateway:
- customersqueryside
- mongodb
environment:
EVENTUATE_API_KEY_ID:
EVENTUATE_API_KEY_SECRET:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
EVENTUATE_API_KEY_ID: ${EVENTUATE_API_KEY_ID}
EVENTUATE_API_KEY_SECRET: ${EVENTUATE_API_KEY_SECRET}
accountscommandside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: accountscommandside
volumes:
- ./accounts-command-side-service/build/libs:/app
command: java ${JAVA_OPTS} -jar /app/accounts-command-side-service.jar
ports:
- "8085:8080"
environment:
EVENTUATE_API_KEY_ID:
EVENTUATE_API_KEY_SECRET:
EVENTUATE_API_KEY_ID: ${EVENTUATE_API_KEY_ID}
EVENTUATE_API_KEY_SECRET: ${EVENTUATE_API_KEY_SECRET}
transactionscommandside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: transactionscommandside
volumes:
- ./transactions-command-side-service/build/libs:/app
command: java ${JAVA_OPTS} -jar /app/transactions-command-side-service.jar
ports:
- "8082:8080"
environment:
EVENTUATE_API_KEY_ID:
EVENTUATE_API_KEY_SECRET:
EVENTUATE_API_KEY_ID: ${EVENTUATE_API_KEY_ID}
EVENTUATE_API_KEY_SECRET: ${EVENTUATE_API_KEY_SECRET}
accountsqueryside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: accountsqueryside
volumes:
- ./accounts-query-side-service/build/libs:/app
command: java ${JAVA_OPTS} -jar /app/accounts-query-side-service.jar
ports:
- "8081:8080"
links:
- mongodb
environment:
EVENTUATE_API_KEY_ID:
EVENTUATE_API_KEY_SECRET:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
EVENTUATE_API_KEY_ID: ${EVENTUATE_API_KEY_ID}
EVENTUATE_API_KEY_SECRET: ${EVENTUATE_API_KEY_SECRET}
customerscommandside:
image: java:openjdk-8u91-jdk
working_dir: /app
extends:
file: docker-compose-common.yml
service: customerscommandside
volumes:
- ./customers-command-side-service/build/libs:/app
command: java ${JAVA_OPTS} -jar /app/customers-command-side-service.jar
ports:
- "8083:8080"
environment:
EVENTUATE_API_KEY_ID:
EVENTUATE_API_KEY_SECRET:
EVENTUATE_API_KEY_ID: ${EVENTUATE_API_KEY_ID}
EVENTUATE_API_KEY_SECRET: ${EVENTUATE_API_KEY_SECRET}
customersqueryside:
extends:
file: docker-compose-common.yml
service: customersqueryside
image: java:openjdk-8u91-jdk
working_dir: /app
volumes:
- ./customers-query-side-service/build/libs:/app
command: java ${JAVA_OPTS} -jar /app/customers-query-side-service.jar
ports:
- "8084:8080"
links:
- mongodb
environment:
EVENTUATE_API_KEY_ID:
EVENTUATE_API_KEY_SECRET:
SPRING_DATA_MONGODB_URI: mongodb://mongodb/mydb
EVENTUATE_API_KEY_ID: ${EVENTUATE_API_KEY_ID}
EVENTUATE_API_KEY_SECRET: ${EVENTUATE_API_KEY_SECRET}
mongodb:
image: mongo:3.0.4
hostname: mongodb
command: mongod --smallfiles
ports:
- "27017:27017"
extends:
file: docker-compose-common.yml
service: mongodb

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@@ -7,4 +7,3 @@ springBootVersion=1.3.5.RELEASE
eventuateClientVersion=0.10.0.RELEASE
eventuateLocalVersion=0.4.0.RELEASE

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@@ -1,4 +1,3 @@
#! /bin/bash
docker run --link javaspring_mongodb_1:mongodb -i -t mongo:3.0.4 /usr/bin/mongo --host mongodb
docker run --rm --link javaspring_mongodb_1:mongodb -i -t mongo:3.0.4 /usr/bin/mongo --host mongodb

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@@ -15,6 +15,7 @@ dependencies {
compile "org.springframework.boot:spring-boot-starter-actuator"
compile "io.eventuate.client.java:eventuate-client-java-http-stomp-spring:$eventuateClientVersion"
compile project(":common-swagger")
testCompile project(":testutil")
testCompile "org.springframework.boot:spring-boot-starter-test"
@@ -27,4 +28,4 @@ task copyWebStatic(type: Copy) {
}
jar.dependsOn(copyWebStatic)
bootRun.dependsOn(copyWebStatic)
bootRun.dependsOn(copyWebStatic)

21
java-spring/set-env.sh Normal file
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@@ -0,0 +1,21 @@
if [ -z "$DOCKER_HOST_IP" ] ; then
if [ -z "$DOCKER_HOST" ] ; then
export DOCKER_HOST_IP=`hostname`
else
echo using ${DOCKER_HOST?}
XX=${DOCKER_HOST%\:*}
export DOCKER_HOST_IP=${XX#tcp\:\/\/}
fi
fi
echo DOCKER_HOST_IP is $DOCKER_HOST_IP
export SPRING_DATASOURCE_URL=jdbc:mysql://${DOCKER_HOST_IP}/eventuate
export SPRING_DATASOURCE_USERNAME=mysqluser
export SPRING_DATASOURCE_PASSWORD=mysqlpw
export SPRING_DATASOURCE_DRIVER_CLASS_NAME=com.mysql.jdbc.Driver
export EVENTUATELOCAL_KAFKA_BOOTSTRAP_SERVERS=$DOCKER_HOST_IP:9092
export EVENTUATELOCAL_CDC_DB_USER_NAME=root
export EVENTUATELOCAL_CDC_DB_PASSWORD=rootpassword
export EVENTUATELOCAL_ZOOKEEPER_CONNECTION_STRING=$DOCKER_HOST_IP:2181

7
java-spring/show-urls.sh Executable file
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@@ -0,0 +1,7 @@
#!/bin/bash -e
IP=$(docker-machine ip default)
echo Accounts command-side service = http://${IP}:8080/swagger-ui.html
echo Money Transfers command-side service = http://${IP}:8082/swagger-ui.html
echo Accounts query-side service = http://${IP}:8081/swagger-ui.html

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@@ -13,6 +13,7 @@ while [[ "$done" = false ]]; do
done=true
else
done=false
break
fi
done
if [[ "$done" = true ]]; then