Event-Driven ColdFusion With ColdBox Interceptors and SQS: Decoupling Your Monolith

You decouple a ColdFusion monolith by making it event-driven — instead of one giant function that does ten things in sequence, code announces that something happened and independent listeners react. ColdFusion gives you two complementary tools for this. ColdBox interceptors are an in-process event bus: they implement the observer/publisher-subscriber pattern, so you announce("onOrderPlaced", { order = prc.order }) and any registered interceptor "listening" for that event runs — decoupling your code within the application without the caller knowing who reacts. Amazon SQS (Simple Queue Service) is an out-of-process, durable message queue: your app drops a message on a queue with ColdFusion's native getCloudService() SQS integration (built in since ColdFusion 2021), and a separate worker consumes and processes it later — decoupling work across time and process, so slow or failure-prone tasks (emails, PDF generation, third-party syncs) run asynchronously and don't block or crash the request. Used together: an interceptor fires on a domain event and drops a durable message on SQS; a worker processes it independently. This is how a tangled ColdFusion monolith becomes a set of loosely-coupled, event-driven components — without a full microservices rewrite. This guide shows both, with working code.
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