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Example of a more complex EPC diagram (in German). An event-driven process chain (EPC) is a type of flow chart for business process modeling.EPC can be used to configure enterprise resource planning execution, and for business process improvement.
In simple event processing, a notable event happens which initiates downstream action(s). Simple event processing is commonly used to drive the real-time flow of work, thereby reducing lag time and cost. [10] For example, simple events can be created by a sensor detecting changes in tire pressures or ambient temperature.
In computer programming, event-driven programming is a programming paradigm in which the flow of the program is determined by external events. UI events from mice , keyboards , touchpads and touchscreens , and external sensor inputs are common cases.
Sequence diagrams are sometimes called event diagrams or event scenarios. For a particular scenario of a use case, the diagrams show the events that external actors generate, their order, and possible inter-system events. [2] The diagram emphasizes events that cross the system boundary from actors to systems.
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.
For example, in the bank example noted above, the event CUSTOMER-ARRIVAL at time t would, if the CUSTOMER_QUEUE was empty and TELLER was idle, include the creation of the subsequent event CUSTOMER-DEPARTURE to occur at time t+s, where s is a number generated from the SERVICE-TIME distribution. [citation needed]
Event-driven SOA is a form of service-oriented architecture (SOA), ... For example, mediation flows are part of the WebSphere enterprise service bus intercept.
Another sample code fragment detects weddings among a flow of external "events" such as church bells ringing, the appearance of a man in a tuxedo or morning suit, a woman in a flowing white gown and rice flying through the air. A "complex" or "composite" event is what one infers from the individual simple events: a wedding is happening.