Introduction to
Service-Orientation
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Service-Orientation
Design Principles
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Effects of Service-Orientation on the Enterprise
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Service-Orientation
in the Real World
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Service-Orientation Design Principles
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Service Loose Coupling
"Service contracts impose low consumer coupling requirements and are themselves decoupled from their surrounding environment."
Coupling refers to a connection or relationship between two things. A measure of coupling is comparable to a level of dependency. This principle advocates the creation of a specific type of relationship within and outside of service boundaries, with a constant emphasis on reducing (“loosening”) dependencies between the service contract, its implementation, and its service consumers.
The principle of Service Loose Coupling promotes the independent design and evolution of a service’s logic and implementation while still guaranteeing baseline interoperability with consumers that have come to rely on the service’s capabilities. There are numerous types of coupling involved in the design of a service, each of which can impact the content and granularity of its contract. Achieving the appropriate level of coupling requires that practical considerations be balanced against various service design preferences.
Figure: Coupling represents a core design consideration that spans both intra and inter-service design.
Chapter 7: Service Coupling (Intra-Service and Consumer Dependencies) provides an in-depth exploration of this principle and introduces related patterns and concepts.
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