Event (computing)

In computing, an event is a detectable occurrence or change in the system's state, such as user input, hardware interrupts, system notifications, or changes in data or conditions, that the system is designed to monitor. Events trigger responses or actions and are fundamental to event-driven systems. These events can be handled synchronously, where the execution thread is blocked until the event handler completes its processing, or asynchronously, where the event is processed independently, often through an event loop. Even when synchronous handling appears to block execution, the underlying mechanism in many systems is still asynchronous, managed by the event loop. ^[1]^[2]

Events can be implemented through various mechanisms such as callbacks, message objects, signals, or interrupts, and events themselves are distinct from the implementation mechanisms used. Event propagation models, such as bubbling, capturing, and pub/sub, define how events are distributed and handled within a system. Other key aspects include event loops, event queueing and prioritization, event sourcing, and complex event processing patterns. These mechanisms contribute to the flexibility and scalability of event-driven systems. ^[1]^[2]

^ ^a ^b Cite error: The named reference :0 was invoked but never defined (see the help page).
^ ^a ^b Fowler, Martin (2003). Patterns of Enterprise Application Architecture. Addison-Wesley Professional. ISBN 978-0321127426.

[:0-1] Cite error: The named reference :0 was invoked but never defined (see the help page).

[:3-2] Fowler, Martin (2003). Patterns of Enterprise Application Architecture. Addison-Wesley Professional. ISBN 978-0321127426.

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Event (computing)

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