DDD in action. Evolution of application architecture and complexity

In this workshop we will cover.

1. Build of the mvp application without DDD is a win and short time to market.
2. Prepare initial separation for domain logic, because our team has grown and collaboration became hard.
3. Proceed with Ubiquitous language and refactor our app so that class names allign with customer language.
4. Split solution in two services and connect them with HTTP
5. Prepare an aggregate Root
6. Prepare a repository
7. Introduce concept of value objects
8. Introduce repository
9. Move forward and introduce pub/sub integration between services
10. Prepare Integration event, aboid domain events, they needed to connect two domains in one solution, which is bad.
11. Move forward with solution integration

Homework. Introduce aggregate roots for entities in Delivery service Store Product in DeliveryRequest service as a value object, so that you can have an extended aggregate.

Step 0. Azure infrastructure.

subscriptionID=$(az account list --query "[?contains(name,'Microsoft')].[id]" -o tsv)
echo "Test subscription ID is = " $subscriptionID
az account set --subscription $subscriptionID
az account show

location=northeurope
postfix=$RANDOM

#----------------------------------------------------------------------------------
# Main group .
#----------------------------------------------------------------------------------

groupName=fwdaysDddAction$postfix
az group create --name $groupName --location $location

#----------------------------------------------------------------------------------
# Storage account with Blob container
#----------------------------------------------------------------------------------

location=northeurope
accountSku=Standard_LRS
accountName=${groupName,,}
echo "accountName  = " $accountName

az storage account create --name $accountName --location $location --kind StorageV2 \
--resource-group $groupName --sku $accountSku --access-tier Hot  --https-only true
  
storageAccountKey=$(az storage account keys list --resource-group $groupName --account-name $accountName --query "[0].value" | tr -d '"')
ordersAccConString="DefaultEndpointsProtocol=https;AccountName=$accountName;AccountKey=$storageAccountKey;EndpointSuffix=core.windows.net"
   
requestQueue=balance-requests
resultQueue=factory-requests
errorQueue=failed-orders
rollbackSuccessQueue=rollback-success
compensatingTable=compensatingCommands
resultTable=processedOrders
ordersQueue=received-orders

az storage queue create --name $ordersQueue --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

az storage queue create --name $requestQueue --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

az storage queue create --name $resultQueue --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

az storage queue create --name $errorQueue --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

az storage queue create --name $rollbackSuccessQueue --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

az storage table create --name $compensatingTable --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

az storage table create --name $resultTable --account-key $storageAccountKey \
--account-name $accountName --connection-string $ordersAccConString

#----------------------------------------------------------------------------------
# Function app with Application insights(created ayutomatically)
#----------------------------------------------------------------------------------

applicationName=${groupName,,}
accountName=${groupName,,}
echo "applicationName  = " $applicationName

az functionapp create --resource-group $groupName \
--name $applicationName --storage-account $accountName \
--consumption-plan-location $location --functions-version 3

az functionapp update --resource-group $groupName --name $applicationName --set dailyMemoryTimeQuota=400000
az functionapp config appsettings set --resource-group $groupName --name $applicationName --settings "MSDEPLOY_RENAME_LOCKED_FILES=1"
az functionapp config appsettings set --resource-group $groupName --name $applicationName --settings ASPNETCORE_ENVIRONMENT=Production
az functionapp config appsettings set --resource-group $groupName --name $applicationName --settings "StorageConnectionString=$ordersAccConString"

#----------------------------------------------------------------------------------
# Azure SQL Server and Serverless DB 1-4 cores and 32 Gb storage
#----------------------------------------------------------------------------------

location=northeurope
serverName=${groupName,,}
adminLogin=Admin$groupName
password=Sup3rStr0ng$groupName$postfix
databaseName=${groupName,,}
serverSku=S0
catalogCollation="SQL_Latin1_General_CP1_CI_AS"

az sql server create --name $serverName --resource-group $groupName --assign-identity \
--location $location --admin-user $adminLogin --admin-password $password

az sql db create --resource-group $groupName --server $serverName --name $databaseName \
--edition GeneralPurpose --family Gen5 --compute-model Serverless \
--auto-pause-delay 60 --capacity 4

outboundIps=$(az webapp show --resource-group $groupName --name $applicationName --query possibleOutboundIpAddresses --output tsv)
IFS=',' read -r -a ipArray <<< "$outboundIps"

for ip in "${ipArray[@]}"
do
echo "$ip add"
az sql server firewall-rule create --resource-group $groupName --server $serverName \
--name "WebApp$ip" --start-ip-address $ip --end-ip-address $ip
done

sqlClientType=ado.net
sqlConString=$(az sql db show-connection-string --name $databaseName --server $serverName --client $sqlClientType --output tsv)
sqlConString=${sqlConString/Password=<password>;}
sqlConString=${sqlConString/<username>/$adminLogin}

orderDbPassword=$password

#----------------------------------------------------------------------------------


#----------------------------------------------------------------------------------
# Additional group with second app
#----------------------------------------------------------------------------------

deliveryGroupName=tpaperDeliveryUA$postfix
az group create --name $deliveryGroupName --location $location

#----------------------------------------------------------------------------------
# Storage account
#----------------------------------------------------------------------------------

location=northeurope
accountSku=Standard_LRS
deliveryAccountName=${deliveryGroupName,,}
echo "accountName  = " $deliveryAccountName

az storage account create --name $deliveryAccountName --location $location --kind StorageV2 \
--resource-group $deliveryGroupName --sku $accountSku --access-tier Hot  --https-only true
  
deliveryStorageAccountKey=$(az storage account keys list --resource-group $deliveryGroupName --account-name $deliveryAccountName --query "[0].value" | tr -d '"')
deliveryAccConString="DefaultEndpointsProtocol=https;AccountName=$deliveryAccountName;AccountKey=$storageAccountKey;EndpointSuffix=core.windows.net"

#----------------------------------------------------------------------------------
# Function app with Application insights(created and connected automatically)
#----------------------------------------------------------------------------------

deliveryApplicationName=${deliveryGroupName,,}
echo "applicationName  = " $deliveryApplicationName

az functionapp create --resource-group $deliveryGroupName \
--name $deliveryApplicationName --storage-account $deliveryAccountName \
--consumption-plan-location $location --functions-version 3

az functionapp update --resource-group $deliveryGroupName --name $deliveryApplicationName --set dailyMemoryTimeQuota=400000
az functionapp config appsettings set --resource-group $deliveryGroupName --name $deliveryApplicationName --settings "MSDEPLOY_RENAME_LOCKED_FILES=1"
az functionapp config appsettings set --resource-group $deliveryGroupName --name $deliveryApplicationName --settings ASPNETCORE_ENVIRONMENT=Production
az functionapp config appsettings set --resource-group $deliveryGroupName --name $deliveryApplicationName --settings "StorageConnectionString=$deliveryAccConString"

#----------------------------------------------------------------------------------
# Azure SQL Server and Serverless DB 1-4 cores and 32 Gb storage
#----------------------------------------------------------------------------------

location=northeurope
serverName=${deliveryGroupName,,}
adminLogin=Admin$deliveryGroupName
password=Sup3rStr0ng$deliveryGroupName$postfix
databaseName=${deliveryGroupName,,}
serverSku=S0
catalogCollation="SQL_Latin1_General_CP1_CI_AS"

az sql server create --name $serverName --resource-group $deliveryGroupName --assign-identity \
--location $location --admin-user $adminLogin --admin-password $password

az sql db create --resource-group $deliveryGroupName --server $serverName --name $databaseName \
--edition GeneralPurpose --family Gen5 --compute-model Serverless \
--auto-pause-delay 60 --capacity 4

outboundIps=$(az webapp show --resource-group $deliveryGroupName --name $deliveryApplicationName --query possibleOutboundIpAddresses --output tsv)
IFS=',' read -r -a ipArray <<< "$outboundIps"

for ip in "${ipArray[@]}"
do
echo "$ip add"
az sql server firewall-rule create --resource-group $deliveryGroupName --server $serverName \
--name "WebApp$ip" --start-ip-address $ip --end-ip-address $ip
done

sqlClientType=ado.net
sqlConStringDelivery=$(az sql db show-connection-string --name $databaseName --server $serverName --client $sqlClientType --output tsv)
sqlConStringDelivery=${sqlConStringDelivery/Password=<password>;}
sqlConStringDelivery=${sqlConStringDelivery/<username>/$adminLogin}

deliveryDbPassword=$password

#----------------------------------------------------------------------------------

#----------------------------------------------------------------------------------
# Strings for local variables
#----------------------------------------------------------------------------------

printf "\n\nRun string below in local cmd prompt to assign secret to environment variable SqlPaperString:\nsetx SqlPaperString \"$sqlConString\"\n\n"
printf "\n\nRun string below in local cmd prompt to assign secret to environment variable SqlPaperPassword:\nsetx SqlPaperPassword \"$orderDbPassword\"\n\n"

printf "\n\nRun string below in local cmd prompt to assign secret to environment variable SqlPaperDeliveryString:\nsetx SqlPaperDeliveryString \"$sqlConStringDelivery\"\n\n"
printf "\n\nRun string below in local cmd prompt to assign secret to environment variable SqlPaperDeliveryPassword:\nsetx SqlPaperDeliveryPassword \"$deliveryDbPassword\"\n\n"

printf "\n\nRun string below in local cmd prompt to assign secret to environment variable ordersAccConString:\nsetx OrdersAccConString \"$ordersAccConString\"\n\n"
printf "\n\nRun string below in local cmd prompt to assign secret to environment variable deliveryAccConString:\nsetx DeliveryAccConString \"$deliveryAccConString\"\n\n"