There is a lot of interest in how Mule supports emerging patterns like CQRS (Command Query Responsibility Segregation), so I wanted to create a series of blog posts discussing an insightful approach. Over the course of the series so far, we described the initial problem at hand and how to solve it using CQRS and API-led Connectivity. Next, we designed and implemented the synchronous Query API application followed by the implementation of the asynchronous Command API application with a composable API architecture.

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In this 4 part blog series, I describe in detail how one might go about modernizing a functional, but legacy Supplier Relationship Management (SRM) application without redeveloping (or even touching) it. Why? The release cycle for the legacy app is too long and it doesn’t scale in a way that will meet the needs of newly required mobile application.

Additionally, an aspect of SOLID software design is the Open/Closed Principle which in our case can be applied as we are extending and providing functionality without actually modifying the core application.

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Part 2: Building a Data Query Application

In a previous blog, we talked through how you might design a solution to deliver a Command Query Responsibility Segregation (CQRS) pattern with Anypoint Platform. In this blog, we’ll discuss how an API-led connectivity approach can help you deliver this pattern (and the mobile application your business is demanding) with speed and scale while maintaining control over your critical data assets.

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Part 1: The Challenge

Let’s imagine you’ve been working as an architect in a large company for several years and are very proud of the now mature Supplier Relationship Management (SRM) application you specified, formed, and delivered to the business, as it continues to provide value.

Functionally, the SRM is a web application that allows for managing relationships of suppliers and materials, maintaining hierarchical structures, uncovering unwanted dependencies and helping your clients significantly reduce supplier costs.

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