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This Axon Framework demo application focuses around a simple giftcard domain, designed to show various aspects of the framework. The app can be run in various modes, using Spring-boot Profiles: by selecting a specific profile, only the corresponding parts of the app will be active. Select none, and the default behaviour is activated, which activates everything. This way you can experiment with Axon in a (structured) monolith as well as in micro-services.
See the wikipedia article for a basic definition of gift cards. Essentially, there are just two events in the life cycle of a gift card:
The Giftcard application is split into four parts, using four sub-packages of io.axoniq.demo.giftcard:
api package contains the (Kotlin) sourcecode of the messages and entity. They form the API (sic) of the application.command package contains the GiftCard Aggregate class, with all command- and associated eventsourcing handlers.query package provides the query handlers, with their associated event handlers.gui package contains the Vaadin-based Web GUI.Of these packages, command, query, and gui are also configured as profiles.
To build the demo app, simply run the provided Maven wrapper:
mvnw clean package
Note that for Mac OSX or Linux you probably have to add "./" in front of mvnw.
The simplest way to run the app is by using the Spring-boot maven plugin:
mvnw spring-boot:run
However, if you have copied the jar file giftcard-demo-1.0.jar from the Maven target directory to some other location, you can also start it with:
java -jar giftcard-demo-1.0.jar
The Web GUI can be found at http://localhost:8080.
If you want to activate only the command profile, use:
java -Dspring.profiles.active=command giftcard-demo-1.0.jar
Idem for query and gui.
To run the Giftcard app as if it were three seperate micro-services, use the Spring-boot spring.profiles.active option as follows:
$ java -Dspring.profiles.active=command -jar giftcard-demo-1.0.jar
This will start only the command part. To complete the app, open two other command shells, and start one with profile query, and the last one with gui. Again you can open the Web GUI at http://localhost:8080. The three parts of the application work together through the running instance of the Axon Server, which distributes the Commands, Queries, and Events.
By default the Axon Framework is configured to expect a running Axon Server instance, and it will complain if the server is not found. To run Axon Server, you'll need a Java runtime (JRE versions 8 through 10 are currently supported, Java 11 still has Spring-boot related growing-pains). A copy of the server JAR file has been provided in the demo package. You can run it locally, in a Docker container (including Kubernetes or even Mini-kube), or on a separate server.
To run Axon Server locally, all you need to do is put the server JAR file in the directory where you want it to live, and start it using:
java -jar axonserver-4.1-6.jar
You will see that it creates a subdirectory data where it will store its information.
To run Axon Server in Docker you can use the image provided on Docker Hub:
$ docker run -d --name my-axon-server -p 8024:8024 -p 8124:8124 axoniq/axonserver
...some container id...
$
WARNING This is not a supported image for production purposes. Please use with caution.
If you want to run the clients in Docker containers as well, and are not using something like Kubernetes, use the "--hostname" option of the docker command to set a useful name like "axonserver", and pass the AXONSERVER_HOSTNAME environment variable to adjust the properties accordingly:
$ docker run -d --name my-axon-server -p 8024:8024 -p 8124:8124 --hostname axonserver -e AXONSERVER_HOSTNAME=axonserver axoniq/axonserver
When you start the client containers, you can now use "--link axonserver" to provide them with the correct DNS entry. The Axon Server-connector looks at the "axon.axonserver.servers" property to determine where Axon Server lives, so don't forget to set it to "axonserver".
WARNING: Although you can get a pretty functional cluster running locally using Mini-Kube, you can run into trouble when you want to let it serve clients outside of the cluster. Mini-Kube can provide access to HTTP servers running in the cluster, for other protocols you have to run a special protocol-agnostic proxy like you can with "kubectl port-forward <pod-name> <port-number>". For non-development scenarios, we don't recommend using Mini-Kube.
Deployment requires the use of a YAML descriptor, an working example of which can be found in the "kubernetes" directory. To run it, use the following commands in a separate window:
$ kubectl apply -f kubernetes/axonserver.yaml
statefulset.apps "axonserver" created
service "axonserver-gui" created
service "axonserver" created
$ kubectl port-forward axonserver-0 8124
Forwarding from 127.0.0.1:8124 -> 8124
Forwarding from [::1]:8124 -> 8124
You can now run the Giftcard app, which will connect throught the proxied gRPC port. To see the Axon Server Web GUI, use "minikube service --url axonserver-gui" to obtain the URL for your browser. Actually, if you leave out the "--url", minikube will open the the GUI in your default browser for you.
To clean up the deployment, use:
$ kubectl delete sts axonserver
statefulset.apps "axonserver" deleted
$ kubectl delete svc axonserver
service "axonserver" deleted
$ kubectl delete svc axonserver-gui
service "axonserver-gui" deleted
If you're using a 'real' Kubernetes cluster, you'll naturally not want to use "localhost" as hostname for Axon Server, so you need to add three lines to the container spec to specify the "AXONSERVER_HOSTNAME" setting:
...
containers:
- name: axonserver
image: axoniq/axonserver
imagePullPolicy: Always
ports:
- name: grpc
containerPort: 8124
protocol: TCP
- name: gui
containerPort: 8024
protocol: TCP
readinessProbe:
httpGet:
port: 8024
path: /actuator/health
initialDelaySeconds: 5
periodSeconds: 5
timeoutSeconds: 1
env:
- name: AXONSERVER_HOSTNAME
value: axonserver
---
apiVersion: v1
kind: Service
...
Use "axonserver" (as that is the name of the Kubernetes service) if you're going to deploy the client next to the server in the cluster, which is what you'ld probably want. Running the client outside the cluster, with Axon Server inside, entails extra work to enable and secure this, and is definitely beyond the scope of this example.
Axon Server uses sensible defaults for all of its settings, so it will actually run fine without any further configuration. However, if you want to make some changes, below are the most common options.
The axoniq/axonserver image can be customized at start by using one of the following environment variables. If no default is mentioned, leaving the environement variable unspecified will not add a line to the properties file.
AXONSERVER_NAME
This is the name the Axon Server uses for itself.
AXONSERVER_HOSTNAME
This is the hostname Axon Server communicates to the client as its contact point. Default is "localhost", because Docker generates a random name that is not resolvable outside of the container.
AXONSERVER_DOMAIN
This is the domain Axon Server can suffix the hostname with.
AXONSERVER_HTTP_PORT
This is the port Axon Server uses for its Web GUI and REST API.
AXONSERVER_GRPC_PORT
This is the gRPC port used by clients to exchange data with the server.
AXONSERVER_TOKEN
Setting this will enable access control, which means the clients need to pass this token with each request.
AXONSERVER_EVENTSTORE
This is the directory used for storing the Events.
AXONSERVER_CONTROLDB
This is where Axon Server stores information of clients and what types of messages they are interested in.
There are a number of things you can finetune in the server configuration. You can do this using an "axonserver.properties" file. All settings have sensible defaults.
axoniq.axonserver.name
This is the name Axon Server uses for itself. The default is to use the hostname.
axoniq.axonserver.hostname
This is the hostname clients will use to connect to the server. Note that an IP address can be used if the name cannot be resolved through DNS. The default value is the actual hostname reported by the OS.
server.port
This is the port where Axon Server will listen for HTTP requests, by default 8024.
axoniq.axonserver.port
This is the port where Axon Server will listen for gRPC requests, by default 8124.
axoniq.axonserver.event.storage
This setting determines where event messages are stored, so make sure there is enough diskspace here. Losing this data means losing your Events-sourced Aggregates' state! Conversely, if you want a quick way to start from scratch, here's where to clean.
axoniq.axonserver.controldb-path
This setting determines where the message hub stores its information. Losing this data will affect Axon Server's ability to determine which applications are connected, and what types of messages they are interested in.
axoniq.axonserver.accesscontrol.enabled
Setting this to true will require clients to pass a token.
axoniq.axonserver.accesscontrol.token
This is the token used for access control.
Axon Server provides two servers; one serving HTTP requests, the other gRPC. By default these use ports 8024 and 8124 respectively, but you can change these in the settings.
The HTTP server has in its root context a management Web GUI, a health indicator is available at /actuator/health, and the REST API at /v1. The API's Swagger endpoint finally, is available at /swagger-ui.html, and gives the documentation on the REST API.
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