Overview

Overview

Tentacolous is a Spring Boot library that runs Java methods when a database table receives an INSERT, UPDATE, or DELETE.

The important difference is that Tentacolous reacts to database changes regardless of where they originate.

Version 0.1.8 focuses on reusable programmatic filters. A filter can inspect the current entity, the previous entity during updates, and the operation before deciding whether the listener should run. This works with the new generic @TentacolousListener and with the existing @UponInserting, @UponUpdating, and @UponDeleting annotations.

1. It creates an event table.

2. It creates a PostgreSQL function.

3. It creates triggers for tables that have listeners.

4. The triggers write events into db_change_event.

5. A Spring poller reads those events.

6. Tentacolous converts the JSON payload into your Java entity.

7. Tentacolous runs the annotated method.