Implementing CEP logic

Up to this point, we have mostly used control services to orchestrate business processes. In the previous examples, an end user initiated a business process via publishing an event from a BFF service. Humans are excellent complex-event processors. We naturally process all kinds of inputs and quickly make decisions, but we aren't always paying attention, or there may be too many inputs to reliably and consistently process them all.This is where we can use control services to perform CEP and emit events to alert downstream services of their findings. The processing logic is considered complex because we are not just reacting to a single event. We collect and correlate multiple events and evaluate conditions across them for actionable insights. For example, we could audit a business process and assert that it is adhering to expectations. We have already seen a basic example of CEP when joining parallel paths in a business process.Let's look at how we can...