Page Controller Pattern Explained | One Small Controller Per Page

How do you avoid one giant handler with a huge if-else chain trying to run every page on your site? That's the problem the Page Controller Pattern helps solve. In this video, we explore the Page Controller Pattern, an enterprise pattern that gives every page, or every distinct action, its own small controller that reads the request, runs the model, and picks a view. You'll learn: What the Page Controller Pattern is What problem the Page Controller Pattern solves Why one giant handler sorting requests by hand becomes unmanageable How each page gets its own controller mapped directly from the URL How a controller reads input, runs the model, and chooses a view A practical example of the Page Controller Pattern The difference between Page Controller and Front Controller The trade-off of duplicated cross-cutting checks across page controllers When to use the Page Controller Pattern The benefits and trade-offs of using Page Controller The key idea is simple: One page. One controller. Easy to follow. Page Controller is particularly useful when your site has a natural page-by-page structure, when you want an obvious URL-to-code mapping, or when different pages truly behave differently — like a checkout controller handling both showing the form and submitting payment, or a brand-new product detail controller added without touching any existing page. This video is part of the System by Design series, where we explore software design patterns, system design, software architecture, and engineering best practices. The goal isn't just to memorize patterns. It's to understand the problem they solve, why they work, when to use them, and the trade-offs they introduce. Learn the patterns. Understand the principles. Design better systems. #PageControllerPattern #EnterprisePatterns #SoftwareEngineering