Extensibility in Service Design: A Practical Approach
In the rapidly evolving digital landscape, the ability to adapt and grow is paramount for businesses. One key strategy to achieve this is by designing services with extensibility in mind. This article explores the concept of extensibility, its benefits, and when it should be applied, using a practical example relevant to North East India.
The Importance of Extensibility
Extensibility, the ability to add new functionality easily as a service's context grows, is a crucial factor in service design. It allows businesses to keep pace with changing market demands and technological advancements.
A Practical Example: Payment Services in North East India
Imagine a Payment Service in North East India responsible for handling payments and refunds using various methods, such as credit cards, gift cards, PayPal, and cash on delivery. As the region's economy expands, new payment methods like store credit from returns, reward points, Apple Pay, or Samsung Pay may become popular. If all the logic for these payment methods resides within one large service, adding a new method would require re-testing all existing payment methods, re-deploying the entire service, and dealing with larger test suites and higher risks of regression.
The Benefits of Splitting Services
Splitting the large service into smaller, focused services, such as Credit Card Processing, Gift Card Processing, PayPal Processing, and so on, offers several advantages. Adding a new payment method like Reward Points, for instance, would only require developing one new service, testing only that service, and deploying it independently. This results in faster development, smaller and more focused test scopes, and lower risks during deployment.
When to Apply Extensibility
Extensibility should be used to split services only when new functionality is likely to be added frequently in the future or when the domain naturally evolves over time. For example, a Notification Service, with its limited number of notification channels (SMS, Email, Letters), often makes sense as a single service. However, a Payment Processing Service, with its high likelihood of introducing new payment methods, benefits from being split by payment type.
A Forward Look
Extensibility is not about splitting services prematurely; it's about anticipating growth where growth is expected. As you design your services, consider how the domain will evolve, not just how it looks today. By doing so, you'll be better equipped to handle the dynamic needs of your business and the region.