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As a working framework, we define the following relationship styles for service aspects among requesters and providers: An aspect is coupled if changes to the aspect by one party in the interaction (requester, provider, or mediating infrastructure) require corresponding changes by the other parties. An aspect is declared if its behavior is specified in the interface to the service, and service requesters and providers can only interact if they have matching declared behavior, and this behavior is consistent with the capabilities of the intermediary infrastructure supporting the interaction.
How can we change and evolve the systems and interactions on the timescales required by the business? Enabling infrastructure – How do we build the technical infrastructure to support, execute, manage, and measure these interactions, services, components, and processes? 2, “Introduction to service-oriented architecture” on page 37, is an approach to defining integration architectures based on the concept of a service. The business and infrastructure functions that are required to make an effective on demand environment are provided as services.
All messages can become events if deploying the service binds the message to a topic in the event space. For both events and messages, mediations can be used to facilitate interactions (for example, to find services that provide capabilities that a requestor is asking for or to take care of interface mismatches between requesters and providers that are compatible in terms of their capabilities). The Enterprise Service Bus supports a broad spectrum of ways to get on and off the bus, including on ramps for legacy applications or business connections that enable external partners in B2B interaction scenarios to participate in the service interaction game.