Events & Notifications

RapidREST has several related but distinct systems for reacting to things that happen outside the normal request/response cycle, and for reaching people (or other services) when something needs their attention:

• Events - @EventListener, @OnEvent, and the Redis-backed event bus for cross-service communication.
• Notifications - NotificationUtils, for pushing real-time messages to specific connected users.
• Messaging - MessagingUtils, for templated email, Slack, and SMS.
• Alerts - AlertUtils, for PagerDuty/Opsgenie-style incident alerts aimed at your team, not your users.

Events and notifications are often used together. An event fires, and a notification goes out because of it. But all four solve different problems, so it's worth understanding them separately.