The Decoupled Contract pattern separates the service contract or interface from the physical implementation. The service interface is independent of implementation yet aligned with other services in the domain or enterprise service inventory.This is a follow up to the podcast episode on building contract-first services
Distributed development technologies such as .NET and Java allow easy creation of service contracts from existing or newly created components. Although this is relatively easy to accomplish the service contract tends to get expressed using the underlying technology platform – one of the many anti-patterns to avoid. This inhibits interoperability and increases integration effort for service consumers. Additionally, service consumers get forced to a specific implementation thereby considerably increasing technology coupling. Finally, this is problematic for the provider as well. If there is a need to upgrade/replace/change the service implementation, there is high probability that existing consumers will need to change their code.
The Decoupled Contract pattern solves above problems by decoupling the service contract from the implementation. Instead of auto-generating service contract specifications via a WSDL document, this pattern advocates the creation of contracts without taking implementation environment/technology into consideration. This contract will be free of physical data models instantiated in a backend data store and proprietary tokens or attributes specific to a technology platform. Consequently, the service consumers are bound to the decoupled contract and not a particular implementation.
The service and the consumers will still be coupled with any limitations associated with a service implementation (for instance, an implementation may not be able to realize all features of the contract or guarantee policy requirements etc.). It is also possible for a particular implementation technology to impose deficiencies across the service inventory in its entirety. But even given these impacts, the contract-first approach that this pattern facilitates is significant and foundational to service-orientation.
This pattern is beneficial to several design techniques that use Web Services or benefit from a decoupled service contract. Contract Centralization and Service Refactoring patterns are greatly enhanced by this pattern. Service Façade is often applied alongside this pattern as well to realize Concurrent Contracts.