Understanding Event-driven APIs



A traditional application is a linear sequence of instructions, where each instruction depends on the previous one to run. This may be simple and easy to understand, but it can also make the code harder to debug, troubleshoot and maintain. Event-driven architectures solve this problem by separating event handlers from the actual logic of an application. In such cases, code executes only when an event is triggered rather than running continuously through every line of code until it completes its task.

Event-Driven Architectures

  • Event-driven architectures are more efficient than request-response architectures.
  • Event-driven architectures are easier to scale.
  • Event-driven architectures are more resilient to failure than request-response architectures (because they use a different communication protocol).
  • Event-driven architectures are more flexible and thus can easily be adapted for new use cases as they arise over time.

How to Take Advantage of Events

Event-driven code is more explicit. It tells you what you need to know when you need to know it. You no longer have to wade through layers of code looking for the answer. With an event-driven approach, if there’s a problem with a service or application component, the error will bubble up and be reported at the point where it occurred.
Event-driven code is easier to test and maintain. Because your application only executes code when something happens (an event), you can easily mock all those events during unit testing so that they don’t actually execute in your tests but still let them run as expected in production. This makes it much easier for developers who are new or unfamiliar with your system because they’ll never have cause for confusion about how certain actions should take place or what effect they might have on other parts of the system (which can often lead them down rabbit holes as they try different things).
And finally: Event-driven code is easier scaled because there are fewer connections between components; an event only needs one source/sink pair instead of many connections between many sources/sinks each time something happens at runtime(in contrast with classic callback style programming using callbacks which require lots of data passing back and forth between different entities).


Event-Driven Code in Practice

The benefits of event-driven code are numerous. Event-driven code is much more efficient than polling, which can cause a lot of traffic on web servers. It’s also easier to test because you don’t have to simulate user interactions or mock the server response; you fire an event and see what happens. And since you’re not waiting for responses from third parties, there’s less chance for errors and latency in the application.
But these benefits aren’t just theoretical; they have genuine implications for how we write software today. Using events instead of polling, we can build much faster applications that feel like single-page web apps without having to rip out our entire back-end infrastructure or rebuild it from scratch! Event-driven code has been powering some of the most popular tech startups around (e.g., Slack) because it lets us build new features faster than ever before while still using existing infrastructure like servers and databases (which means no expensive DevOps teams are required!).

Other Notable Event-Driven Features

Event-driven applications are not a new concept, but they represent a refinement of how we build software systems. In an event-driven system, you define the asynchronous behavior of your application and then let it run in a forked process until something happens that requires your attention. This makes it useful for applications that need to be responsive and also those which need to scale well (as many of them do).
It’s important to note that while this approach is common in languages like NodeJS or Python, where it’s built into the language itself, it can be implemented in any language as long as you have some notion of non-blocking I/O such that there are callbacks which execute after an operation completes successfully or erratically (such as an error).

With event-driven code, the flow of your application is more explicit and easier to understand.

With event-driven code, the flow of your application is more explicit and easier to understand. It’s important to realize that events are often tied to user actions (button clicks, mouse movements) or data from another service. For example, when an API like vatcheckapi.com has finished a batch an asynchronous batch validation it will trigger an event like “validation_batch_finished”.
With this information, you can instantly know what happened and how it happened at any given time during development. Events are also more predictable than if/else statements because they’re triggered by a specific action instead of just happening whenever there’s no more code to execute. This makes debugging much easier since you know exactly what caused each issue without having to guess or trace back through your codebase looking for the problem spot.


Event-driven code may not be for everyone, but it’s a great option for simpler applications. If you’re working on something more complex, it may be worth the effort to learn about how event-driven architectures work and use them in your own projects.


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