Using Existing APIs to Implement Event-Driven Capabilities

Thanks to the sway of digital transformation, APIs are the basis for creating and connecting modern applications. They provide a standardized interface that hides internal complexity, making it simple for an organization to secure, monitor, and manage how the digital assets it shares are used. 

In this piece, we are going to go over the differences between RESTful and event-driven APIs, talk about event-driven architecture, and how to incorporate event-driven capabilities into already existing APIs.

Restful APIs and Event-Driven APIs

We have already talked about REST-based APIs and event-driven APIs in the past. But to sum things up, RESTFUL APIs are based on the concept that the requestor directs a request message to a replier system which then receives and handles the request. If all goes according to plan, the responding system returns a message in reply. Although this system is reliable and works well for more structured requests, it restricts integrations to those where each system has a clear idea of what it needs from the corresponding body.

On the other hand, event-based solutions depend on asynchronous interactions and emphasize the actions while RESTful systems focus on synchronous interactions and emphasize the resources. In an event-driven architecture, applications integrate various services and products according to event-driven interactions which are initiated by things like event consumers, event emitters, and event channels. Events are generally significant altered conditions that are produced, published, circulated, identified, or consumed. 

In other words, an event-driven design gives servers the ability to send requests and respond to them in real-time. They can also do so in a way that provides greater flexibility in the way data is shared, displayed, and integrated across applications. In event-based APIs, a provider initiates the event and the consumer has to define an endpoint which the provider can call to then send the notification to the consumer. The consumer is then alerted as soon as the bit of information is ready.

Incorporating Event-Driven Capabilities in Existing APIs

It has been pretty much accepted that event-based APIs provide a better solution. The good news is that this doesn’t mean you have to build them from scratch. Here is how you can implement event-driven capabilities into existing APIs and get the desired result. 

Before defining and managing event-driven APIs, any kind of business has to consider several logistical matters such as:

-API management

-Subscription supervision and a logical element to handle the subscription details

-Messaging service that supports pub/sub-models

API management is the process of handling externalized events like how consumers need to consume the events. It’s a blend of Webhooks, event streaming, or the less efficient long polling for a couple of instances. AnyPoint Platform™ comes with robust API management abilities for several deployment configurations and makes sure each API is secure and managed. 

Webhook is a special URL created by the application developer that receives data from an API provider or server without polling. It is also a method to transfer the event to the API provider through a user-defined callback URL. Furthermore, Webhooks are automated messages sent from the server when an event happens, so a call to the URL is made with a payload. 

AnyPoint Platform helps to derive the event-driven APIs through API management and integration services.

There are two main steps to take to implement Webhook management in the AnyPoint Platform: 

-Registering consumer endpoint details via an API.

-Pushing the event messages to consumers once the event occurs.

1. Registering consumer endpoint details via an API

In the API Manager, build API resources to register the consumer endpoints. Then, define callbacks and expose the API to the API consumers who are interested to subscribe to these events so that they can discover and consume them. As part of registering to subscribe to the events, you will need a callback endpoint, as well as event types, and authentication details in case a consumer endpoint is needed.

2. Pushing the event messages to consumers once the event occurs

AnyPoint Platform includes strong integration and over 250 unique connectors to integrate with different systems, leverage the connectors, and create Mule Flows to consume the events from the source system and push the messages to registered callback URLs. A simple approach in three steps look like this:

Listen to the events from the source system.

Pick the callback URLs to dispatch the event message.

Send an HTTP POST payload to all the callback URLs.


In the current sphere of technology, everything is driven through API and so event-driven APIs are very necessary for real-time tracking and responding and convenient functionality. AnyPoint Platform API solutions will give your business the abilities to incorporate event-driven capabilities through APIs that already exist.

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