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Part I Summary: Benefits of Combining BPM, SOA, and Web Services
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The following section discusses the individual strengths provided by BPM, SOA, and Web services, and the section, "Complementary Features and Benefits of BPM, SOA, and Web Services," discusses how these approaches and technologies complement each other and how combining them overcomes limitations that they face when used by themselves
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Individual Features and Benefits of BPM, SOA, Web Services, and XML
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Table 6-1 discusses the unique strengths provided by BPM, SOA, and Web services Table 6-1 Individual Features and Benefits of BPM, SOA, Web Services, and XML Unique Features and Benefits BPM Strong focus on process modeling makes business processes explicit so that they are easier to understand, refine, and optimize Modeling tools allow business analysts to communicate business needs and requirements Process logic is maintained separately from the underlying applications and is not hard-coded into these applications, thus making it easier to quickly modify business processes as business needs and requirements change Process automation streamlines business processes and reduces process cycle times Process automation ensures that processes are executed in a consistent fashionfor example, ensuring that all necessary steps are completed, that tasks are only routed to authorized users, and that government regulations are enforced BAM tools provide real-time information on business processes for decision makers and relate that information to key business performance metrics SOA Strong architectural focus (eg, SOA governance, development processes, service and data modeling, and tool support) is ideal for creating long-term strategic value Services provide an ideal level of abstraction for aligning business needs and technical capabilities (compared to procedures, objects, or components) Services provide an ideal level of abstraction for creating reusable, coarse-grained business functionality (compared to procedures, objects, or components)
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Part II: Extended Web Services Specifications
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This part of the book discusses the major extended Web services specifications, focusing on those most significant for SOA-enabled applications The book does not describe every proposed Web services specification Instead, we have picked the most important specifications for SOA-enabled applications
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What Are Extended Specifications
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An additional level of Web services technology is evolving that includes security, transactions, reliability, orchestration, and metadata management for extended SOA-based applications that involve integration and business process management As Web services products include more and more of these features, an SOA based on Web services can be used for more and more kinds of applications The widespread adoption of extended technologies is a prerequisite for success in large-scale Web services projects, and understanding the extent to which the various specifications are supported is important when using products from multiple vendors Care should be taken to minimize dependency on vendorspecific features or to isolate them for easy replacement when standards are completed and available Extended specifications are proposed primarily in the following areas: Metadata management WS-Addressing, WS-MessageDelivery, WS-Policy, Web Services Policy Language, and WS-MetadataExchange for defining ways in which cooperating Web services can discover the features each other supports and interoperate Security WS-Security, XML Signature, XML Encryption, and other specifications for ensuring privacy, message integrity, authentication, and authorized access Reliability WS-Reliability and WS-ReliableMessaging for ensuring that messages are delivered and processed Notification WS-Eventing and WS-Notification for defining additional message exchange patterns such as publish/subscribe Transactions WS-Transactions family and WS-Composite Application Framework for coordinating the work of multiple independent Web services into a larger unit Orchestration WS-BPEL and WS-CDL for combining multiple Web services to perform a larger unit of work The degree to which extended functionality is required varies significantly from application to application; care is needed when assessing what's required from each of these areas for any particular project, particularly when more than one is used in combination The extended features provided by these specifications are intended to be composable, meaning that it should be
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7 Metadata Management
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Metadata is data about data, or more precisely, data about a software entity associated with it in some way For example, a file is an entity, and a file record layout is metadata associated with the file that tells you how to interpret the contents of the file A Web service may have a variety of metadata associated with it, including data types and structures for messages, message exchange patterns for exchanging messages, the network addresses of the endpoints that exchange the messages, and any requirements for extended features such as security, reliability, or transactions Web services metadata is an important part of basic and SOA-based Web services solutions In general, the more complex the application of Web services, the greater the need for metadata and comprehensive metadata management solutions Web services metadata and metadata management technologies include the following: UDDI A registry and repository for storing and retrieving Web services metadata XML Schema For defining data types and structures WSDL For defining messages, message exchange patterns, interfaces, and endpoints WS-Policy For declaring assertions for various qualities of service requirements, such as reliability, security, and transactions WS-Addressing For defining Web service endpoint references and associated message properties WS-MetadataExchange For dynamically accessing XML, WSDL, and WS-Policy metadata when required These different kinds of metadata work together to define the characteristics of any Web service, from simple to complex The metadata items are contained in XML files of varying definition and are typically stored in a directory, such as UDDI or LDAP, or in plain files for easy retrieval All of the metadata items benefit from the use of consistent design and naming conventions, especially for enterprise solutions
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Naming Conventions and Easy Retrieval When thinking about metadata and its management, it's at least as important to develop a consistent means of storing and retrieving the metadata as it is to define it in the first place One of the reasons UDDI failed to gain broad adoption is that it doesn't provide sufficient methods for effectively categorizing and identifying metadata for easy search and retrieval It's an old saying in the database world that you have to know how you're going to retrieve something before you figure out how you're going to store it, and this definitely holds true for metadata How you name your service is important, for example You don't want to call the "customer lookup" service the "customer lookup service" because that's redundant, but you might want to call it the "customer ID lookup" if it uses the customer ID as the search field Another service might be the "customer name lookup" Similarly, it's important to use good names for data items so that whoever ends up requesting the service can easily understand the data that the service provides These conventions are a part of any large project, of course, but they are especially important for services designed for reuse and interoperability The consumers of services will find it especially important to clearly understand and recognize such metadata items as the service
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