# multidatasource-multitenancy

Demonstrates a scenario where a single Spring Boot application connects to multiple databases and also implements multi-tenant logic (schema-based or DB-based).

***

### Application Flow

```mermaid
---
title: Application Data fetching strategy
---
flowchart TD
    A([Appication]) -->|Get Data| B{Where should I get data}
    B --> |primary| C[(Oracle)]
    B --> |secondary| D[(Postgres)]
    C --> |TenantId| E[Discriminator based MultiTenancy]
    D --> |Schema| F[Schema based MultiTenancy]
    E --> |Choose Tenant |G{tenant1 or tenenat2}
    F --> |Choose Schema |H{schema1 or schema2}
    G --> I(((END)))
    H --> I
```

***

### How It Works

1. **Multiple DataSources**: Oracle for certain domain objects, Postgres for others.
2. **MultiTenancy**: Switches which schema or DB to use based on an incoming tenant identifier.
3. **TenantInterceptor**: Captures request-scope tenant info and sets it in the `TenantIdentifierResolver`.

***

### Run tests

`./mvnw clean verify`

### Run locally

```shell
docker-compose -f docker/docker-compose.yml up -d
./mvnw spring-boot:run -Dspring-boot.run.profiles=local
```

### Useful Links

* Swagger UI: <http://localhost:8080/swagger-ui.html>
* Actuator Endpoint: <http://localhost:8080/actuator>
* PgAdmin : <http://localhost:5050>