How can you choose between message-oriented and event-driven architecture?

Pure, event-driven, RTOS free, architecture, fits small, simple and resource limited IOT devices. Effective use of event-driven architecture requires state-machine implementation. With increased design complexity, RTOS supporting tasks and messaging architecture is advisable. The design is divided into tasks, and messages among tasks complete the solution.

Message-oriented architecture is like a messaging system for computer programs. Instead of directly talking to each other, applications send and receive messages through a middleman. This helps them work independently, making communication more flexible, reliable, and efficient. It's like passing notes between friends through a messenger, allowing them to stay connected without always being in the same place at the same time.

Event-driven architecture is like a notification system for software. Instead of programs constantly checking each other, they send or receive 'notifications' called events. When something important happens, like a button click or data change, it triggers a reaction in other parts of the system. It's a way for different pieces of software to stay connected and respond quickly to what's happening without waiting for direct commands.

Even driven architecture enables to build systems without needing to continuously poll for the event to happen. This enables high responsiveness and scalability of the systems. Even driven pattern is also synonymous with the callback mechanism used to be in traditional architecture.

Message-oriented architecture is like passing notes between different parts of a system, focusing on sending and receiving messages. Meanwhile, event-driven architecture is more like reacting to specific happenings, similar to how you respond when something noteworthy occurs. MOA emphasizes message exchange, while EDA revolves around reacting to events as they happen.

Message Oriented Architecture (MOA) is often used for asynchronous communications. It enables loose coupling, scalability and reliability. Event Driven Architecture (EDA) is used for instances where alerting feature is required. Often MOA and EDA are used together to build a reliable and responsive architecture. For instance of an e commerce application, an order placed could be an event and the corresponding order (message) is propagated to the interested systems via a event bus such as Kafka or Rabbit MQ.

Message-Oriented Architecture (MOA): Like Sending Letters: MOA is akin to sending structured messages between system parts, ensuring precise communication and ordered delivery, much like sending specific letters with clear instructions. Event-Driven Architecture (EDA): Reacting to Surprises: EDA is similar to staying alert for surprises. It swiftly reacts to unexpected happenings within the system, enabling quick responses to various events or changes, just like reacting promptly to surprises as they occur.

Message-Oriented Architecture (MOA) Examples: Sending Postal Letters: MOA is like sending specific letters between different parts of a system, ensuring clear, structured communication, much like sending letters with precise content and delivery instructions. Event-Driven Architecture (EDA) Examples: Reacting to Sports Scores: EDA is similar to reacting to live sports scores. Different actions happen in response to goals or points scored, much like systems reacting swiftly to various events or changes as they occur.