tzolov / outbox-pattern

Outbox Pattern

Overview

As part of their business logic, microservices often do not only have to update their own local data store, but they also need to notify other services about data changes that happened. The outbox pattern describes an approach for letting services execute these two tasks in a safe and consistent manner; it provides source services with instant "read your own writes" semantics, while offering reliable, eventually consistent data exchange across service boundaries. -- Gunnar Morling

In this demo we will describe how to implement the Create Order saga. Let’s begin by looking at how to coordinate sagas.

docker-compose -f ./docker-compose.yml  -f ./docker-compose-dbs.yml -f ./docker-compose-wavefront.yml -f ./docker-compose-dood.yml up

order=order-service --spring.datasource.driver-class-name=org.postgresql.Driver --spring.datasource.username=postgresuser --spring.datasource.url="jdbc:postgresql://order-db:5432/orderdb?currentSchema=inventory" --spring.datasource.password=postgrespw  --server.port=21907

cdc-outbox-shipment = cdc-debezium --cdc.name=mycdc --cdc.flattening.enabled=true --cdc.connector=postgres --cdc.config.database.user=postgresuser --cdc.config.database.password=postgrespw --cdc.config.database.dbname=orderdb --cdc.config.database.hostname=order-db --cdc.config.database.port=5432 --cdc.stream.header.offset=true --cdc.config.database.server.name=my-app-connector --cdc.config.tombstones.on.delete=false --cdc.config.table.include.list=inventory.outbox_event | shipment --spring.datasource.driver-class-name=org.postgresql.Driver --spring.datasource.url="jdbc:postgresql://shipment-db:5432/shipmentdb?currentSchema=inventory" --spring.datasource.username=postgresuser --spring.datasource.password=postgrespw --spring.jpa.hibernate.ddl-auto=create --spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

curl -X POST -H "Content-Type: application/json" -d @./resources/data/create-order-request.json http://localhost:21907/orders

curl -X PUT -H "Content-Type: application/json" -d @./resources/data/cancel-order-line-request.json http://localhost:21907/orders/1/lines/2