triggerevents

Triggerevents are events that are produced by a system in response to a triggering condition or action. They function as notifications that enable other components to react, supporting decoupled and often asynchronous workflows. The concept is central to event-driven architectures, where changes in state, user actions, or external inputs generate signals consumed by listeners or subscribers.

In databases, triggers are database objects attached to tables or views. When data modification operations occur, the trigger executes and can emit a trigger event that logs activity, enforces constraints, or integrates with external systems. Trigger events may be processed synchronously as part of the transaction or asynchronously by an event queue or message bus.

In application and service architectures, many frameworks implement event systems that dispatch trigger events when certain actions occur, such as a user submitting a form, a service completing a task, or an internal state change. Handlers or subscribers react to these events to update state, render interfaces, persist data, or invoke other services. Event delivery can be synchronous or asynchronous, and may follow patterns such as publish-subscribe or the observer pattern.

Implementation and design considerations include how events are structured (type, payload, metadata), delivery guarantees (at-most-once, at-least-once, exactly-once), ordering, fault tolerance, and observability. Idempotence and deduplication are common concerns to avoid processing the same trigger multiple times. Security and access control for producers and consumers are also important, especially in distributed systems.

See also: event-driven architecture, database triggers, publish-subscribe, observer pattern, webhooks.