#1CICS and IMS in .NET framework

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Example #1CICS and IMS
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Mainframe-based legacy applications running on CICS and IMS carry out most of the mission-critical business transactions that are performed each and every day, so it is important to understand how to service-enable these legacy systems However, unlike CORBA, CICS and IMS do not provide interface definition languages, nor do they provide reflection capabilities Instead, things like COBOL Copybooks or 3270 screen buffers usually define the interface to CICS and IMS transactions[7] [7] Note that CICS and IMS are not COBOL-specific transaction-processing monitors CICS and IMS transactions can be implemented in several different programming languages, including COBOL, PL/I, and C In this section, we use COBOL and COBOL Copybooks simply as a representative example of how CICS and IMS transactions are implemented Suppose the interface to a CICS or IMS transaction is defined by a pair of COBOL Copybooks (one defines the input data or request message and the other defines the output data or response message) Because COBOL
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Applying SOA and Web Services for IntegrationEnterprise Service Bus Pattern
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A common integration challenge involves answering the question "How should the business rules (and technical rules) for satisfying information requests and data transformation be defined and applied while simultaneously reconciling the competing goals of speed, interoperability, portability, and flexibility " This challenge surfaces in a number places, including: Converting database representations across database systems Converting messages (and files) sent from one system to another Converting data from a public format to an internal format used by a system Converting business documents exchanged between business applications Converting business documents being used for B2B integration A common solution to this problem is defining a reusable technical service using the enterprise service bus (ESB) pattern The ESB (see Figure 4-9) accepts information requests from service requesters (such as "retrieve all information on Fred's Accounts with ABC Bank") and returns the requested information based on metadata describing what information is available from a collection of data services (ie, services whose primary role is to return data) This example also illustrates how reusable technical services (like an ESB) can be built on top of the Web services platform without being embedded in the Web services platform
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Figure 4-9 ESB pattern example [View full size image]
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SummarySOA and Web Services for Integration
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Integration is a challenge that has confronted IT departments for decades Because integration is a multifaceted problem, many different technologies, products, and processes have been used over the years to address it XML and Web services provide the technical tools needed for application integration, but they do not provide a structured integration process to guide their use WSI and SOI represent two views along a spectrum of integration techniques that use XML and Web services WSI tends to be more tactical and opportunistic, whereas SOI tends to be more strategic and systematic Organizations can choose between WSI and SOI depending on business and technical requirements and goals and the level of formality that they want to incorporate into the integration process In reality, most organizations will fall somewhere in between these two Using Web services for legacy integration and as the basis of an ESB are also important aspects of using SOA and Web services to solve integration problems
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5 SOA and Multi-Channel Access
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The primary purpose of most organizations (commercial, government, nonprofit, and so on) is to deliver services to clients, customers, partners, citizens, and other agencies Table 5-1 illustrates this for four key industries by listing the services they deliver, the channels they use to deliver these services, and some of the end-user devices and technologies used to deliver these services Table 5-1 Some Examples of Service-Oriented Businesses Government Telecom, Communication customers, business partners Financial Services Health Care
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Service Requesters
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citizens and other agencies
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customers, business partners
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patients, doctors, insurance carriers, hospitals, government preventative care emergency care out-patient care nursing care prenatal care doctor's office emergency ward telephone mail/fax
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