The ability to send event-driven checks is critical for a variety of applications. Whether it's to alert a driver of a low tire pressure or synchronize production schedules, the faster these events can reach the right place in your system, the more value they have.
The simplest way to think about events is that they're a named change in state within a software or hardware domain. They can be anything: a keystroke, a form filled out, a new order received, or even an update to an existing item in inventory.
Event-driven systems usually split into event producers and event consumers. Typically the event producer doesn't know who the consumer is and vice versa. The event producers publish the events to a stream and the sinks (or event processing engines) receive these notifications and react accordingly.
Many PubSub solutions allow you to configure how long to keep each event in the queue. This is important because some queues can become over-saturated and start to slow down or, in the worst cases, drop messages.
Determining the scope and requirements of your event-driven architecture can help you to plan it effectively. Start by identifying the business use case that will benefit from an event-driven model and how it will fit into your overall system architecture. Then plan out your event stream and the components that will be required. This will include a message broker and the event producers and consumers. Identifying these early can reduce risk and cost during the project.