🔗 Elixir's GenStage demand (a visual explainer)

GenStage is a powerful Elixir abstraction that manages data processing through a simple yet effective concept: demand. As articulated by Andrea Leopardi, the article delves into how GenStage enables efficient data flow between producers and consumers while tackling a common issue in concurrent systems—the problem of unbounded queues. The discussion begins with a real-world example involving message consumption from a queue, illustrating how demand controls the rate at which producers send data. By employing a simple demand structure, consumers can regulate their intake and prevent overwhelming the system. The examination highlights how demand helps manage resources and explores important parameters like max_demand and min_demand, which dictate the rhythm of event processing. With clear explanations and practical examples, the piece offers vital insights for those looking to harness the full potential of GenStage in their applications.