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https://github.com/edeandrea/summit-lab-spring-music
Hands-on Lab for Red Hat Summit 2019
https://github.com/edeandrea/summit-lab-spring-music
redhat spring-boot
Last synced: 25 days ago
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Hands-on Lab for Red Hat Summit 2019
- Host: GitHub
- URL: https://github.com/edeandrea/summit-lab-spring-music
- Owner: edeandrea
- License: apache-2.0
- Created: 2019-04-05T15:15:07.000Z (over 5 years ago)
- Default Branch: pipeline
- Last Pushed: 2024-09-16T10:58:10.000Z (about 2 months ago)
- Last Synced: 2024-09-16T12:30:03.855Z (about 2 months ago)
- Topics: redhat, spring-boot
- Language: Java
- Homepage:
- Size: 1.25 MB
- Stars: 4
- Watchers: 2
- Forks: 11
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
The source code from this was adapted from the well-known [Spring Music](https://github.com/cloudfoundry-samples/spring-music) sample application.
The application has been refactored to use [Spring Cloud Kubernetes](https://spring.io/projects/spring-cloud-kubernetes) as well as adopting the [Event Sourcing](https://martinfowler.com/eaaDev/EventSourcing.html) and [Outbox](https://debezium.io/blog/2020/02/10/event-sourcing-vs-cdc/) patterns.
# Outbox
All events are captured in an Outbox table called `outbox_events`. There is a [Debezium](https://debezium.io) connector [config file](misc/templates/debezium-connector-config.json) which will emit events into the `outbox.${aggregateType}.events` Kafka topic, where `${aggregateType}` is driven by the domain event itself. Currently in this application there is only a single aggregate type, namely `Album`.
The outbox table is defined in the [`OutboxEvent` JPA class](src/main/java/com/redhat/springmusic/domain/jpa/OutboxEvent.java). The resulting table should look like:
```
+-----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------+----------------+
| event_id | bigint | NO | PRI | NULL | auto_increment |
| aggregate_id | varchar(255) | NO | | NULL | |
| aggregate_type | varchar(255) | NO | | NULL | |
| event_timestamp | datetime(6) | NO | | NULL | |
| event_type | varchar(255) | NO | | NULL | |
| payload | json | YES | | NULL | |
+-----------------+--------------+------+-----+---------+----------------+
```
Events will look something like
```json
{
"schema": {
"type": "struct",
"fields": [
{
"type": "string",
"optional": true,
"name": "io.debezium.data.Json",
"version": 1,
"field": "payload"
},
{
"type": "string",
"optional": true,
"field": "eventType"
},
{
"type": "int64",
"optional": false,
"field": "eventId"
},
{
"type": "int64",
"optional": true,
"name": "io.debezium.time.MicroTimestamp",
"version": 1,
"field": "eventTimestamp"
},
{
"type": "string",
"optional": true,
"field": "aggregateId"
},
{
"type": "string",
"optional": true,
"field": "aggregateType"
}
],
"optional": false
},
"payload": {
"payload": "{\"album\":{\"id\":\"5cc93f56-bc12-4e53-aeab-74c17ba027fa\",\"genre\":\"Blues\",\"title\":\"Couldn't Stand The Weather\",\"artist\":\"Stevie Ray Vaughan\",\"albumId\":null,\"trackCount\":0,\"releaseYear\":\"1984\"},\"eventType\":\"ALBUM_CREATED\"}",
"eventType": "ALBUM_CREATED",
"eventId": 29,
"eventTimestamp": 1583344123573000,
"aggregateId": "5cc93f56-bc12-4e53-aeab-74c17ba027fa",
"aggregateType": "Album"
}
}
```
```json
{
"schema": {
"type": "struct",
"fields": [
{
"type": "string",
"optional": true,
"name": "io.debezium.data.Json",
"version": 1,
"field": "payload"
},
{
"type": "string",
"optional": true,
"field": "eventType"
},
{
"type": "int64",
"optional": false,
"field": "eventId"
},
{
"type": "int64",
"optional": true,
"name": "io.debezium.time.MicroTimestamp",
"version": 1,
"field": "eventTimestamp"
},
{
"type": "string",
"optional": true,
"field": "aggregateId"
},
{
"type": "string",
"optional": true,
"field": "aggregateType"
}
],
"optional": false
},
"payload": {
"payload": "{\"eventType\":\"ALBUM_DELETED\",\"deletedAlbum\":{\"id\":\"0d2fc154-5734-4ee4-9c37-231f2c95877b\",\"genre\":\"Blues\",\"title\":\"Texas Flood\",\"artist\":\"Stevie Ray Vaughan\",\"albumId\":null,\"trackCount\":0,\"releaseYear\":\"1983\"}}",
"eventType": "ALBUM_DELETED",
"eventId": 30,
"eventTimestamp": 1583344138851000,
"aggregateId": "0d2fc154-5734-4ee4-9c37-231f2c95877b",
"aggregateType": "Album"
}
}
```
```json
{
"schema": {
"type": "struct",
"fields": [
{
"type": "string",
"optional": true,
"name": "io.debezium.data.Json",
"version": 1,
"field": "payload"
},
{
"type": "string",
"optional": true,
"field": "eventType"
},
{
"type": "int64",
"optional": false,
"field": "eventId"
},
{
"type": "int64",
"optional": true,
"name": "io.debezium.time.MicroTimestamp",
"version": 1,
"field": "eventTimestamp"
},
{
"type": "string",
"optional": true,
"field": "aggregateId"
},
{
"type": "string",
"optional": true,
"field": "aggregateType"
}
],
"optional": false
},
"payload": {
"payload": "{\"after\":{\"id\":\"0e44c7d9-f861-4823-a95e-64fe6bd23727\",\"genre\":\"Rock\",\"title\":\"Hotel California\",\"artist\":\"The Eagles\",\"albumId\":null,\"trackCount\":0,\"releaseYear\":\"1977\"},\"before\":{\"id\":\"0e44c7d9-f861-4823-a95e-64fe6bd23727\",\"genre\":\"Rock\",\"title\":\"Hotel California\",\"artist\":\"The Eagles\",\"albumId\":null,\"trackCount\":0,\"releaseYear\":\"1976\"},\"eventType\":\"ALBUM_UPDATED\"}",
"eventType": "ALBUM_UPDATED",
"eventId": 31,
"eventTimestamp": 1583344145139000,
"aggregateId": "0e44c7d9-f861-4823-a95e-64fe6bd23727",
"aggregateType": "Album"
}
}
```
Next will be working on wiring this together with a schema registry.
If you want to provision this app with all the Kafka clusters/Debezium setup on an OpenShift cluster, you can run the [Ansible Playbook](https://github.com/edeandrea/debezium-demo-apb).