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Summary
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The notion of services is deeply rooted in the business world In this chapter, we defined what a service is, the key concepts of an SOA, the characteristics that a service should possess, and the business and technical benefits of using an SOA with Web services
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3 SOA and Web Services
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In 2, we focused on defining the core concepts and principles of SOA in a technology-neutral manner In this chapter, we consider the relationship between SOA and Web services Web services (SOAP, WSDL, UDDI, and the extended Web services specifications) are a set of open standards that will lead to widespread adoption of SOAs and serve as the basis for a new generation of service oriented development An SOA based on Web services has the following advantages: It is standards-based, meaning that the organization no longer needs to invest in proprietary solutions, which create vendor lock-in It provides interoperability of solutions and allows you to mix and match best-of-breed products from several vendors, which can reduce costs significantly It supports intra-organization integration and can be extended to provide cross-organization and inter-organization integration
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The Web Services Platform
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The Web services platform provides all the facilities necessary to do the following: 1 Allow service requesters and service providers (both line of business services and reusable technical services) to interact in a consistent manner independent of the underlying software domains (ie, programming languages, application servers, TP monitors, communication middleware, directory services, operating systems, and so on) 2 Enforce business rules and policies such as data validation rules, service-level security, service-level management, and service-level agreements 3 Allow an SOA to scale up to handle enterprise-wide, mission-critical business requirements The Web services platform to the greatest extent possible is based on open standards that are product-neutral, technology-neutral, and middleware-neutral so that it can support and integrate services created using a wide variety of products, technologies, platforms, and middleware Figure 3-1 is a high-level diagram showing the role of the Web services platform
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Figure 3-1 Web services platform [View full size image]
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The Web services platform provides the core facilities so that service requesters and service providers can interact in a consistent manner independent of the underlying technology platforms
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Service Contracts
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Every service (ie, line of business service or reusable technical service) has a well-defined, formal interface called its service contract that (a) clearly defines what the service does and (b) clearly separates the service's externally accessible interface from the service's technical implementation
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Service Contract Elements
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Some elements of the service contract apply to the entire service, while other elements apply to the operations that make up the service The elements of the service contract should be machine-readable so that tools can be used to automate development, run-time, and management activities The service contract for a service should include all of the following elements
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Elements of Service Contract
Service names Human-friendly name (plus aliases) as well as a unique machine-readable name Version number Supports the service lifecycle Pre-conditions Conditions that must be satisfied prior to using the servicefor example, an operation may not be accessible between midnight and 2 am Service classification Notes and keywords that identify the business domain(s) that the service supports"yellow page" entries for the service
For Each Operation
Operation name Human-understandable name, plus aliases Pre-conditions Conditions that must be satisfied prior to invoking the operation Post-conditions State changes that occur when the operation completes successfully Input data profile (ie, documents/messages) Name, type, structure, constraints, and meaning of each input document Also indicate required fields, optional fields, cardinality of fields, dependencies among fields, and data validation rules Output data profile (ie, documents/messages) Name, type, structure, constraints, and meaning of each output document Also indicate required fields, optional fields, cardinality of fields, dependencies among fields, and data validation rules Interaction profile What invocation modes does the operation supportrequest/reply, request/poll for results, request with callback, one-way asynchronous invocations How are correlation identifiers handled for matching requests and responses Is the operation conversational in nature, and how is session management