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A Service-Oriented Architecture for Multi-Channel Access
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Organizations need to deliver products and services to customers and partners via multiple channels A multi-channel access architecture based on service-oriented principles makes the organization more agile by allowing it to deliver all products and services in a consistent manner across all distribution channels The multi-channel access pattern is characterized by the need to provide several different types of users with access to a common set of business services where the users employ a diverse set of end-user devices and technologies Figure 5-2 shows a subset of the delivery channels that might be used in a typical system and some of the related client technology
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Figure 5-2 Some end-user devices used to access applications [View full size image]
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Architectural Challenges
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The main architectural challenge of multi-channel access is mediating between the characteristics of a diverse set of end-user devices and the characteristics of the equally diverse set of internal systems and technologies Here are some of the characteristics of these systems that need to be considered (more on these later): Connectivity For some access channels, we can assume that the user is sitting in front of a PC with a fast and reliable connection, while other access channels are constrained by slow and unreliable connections (dial-up users, mobile users, and field technicians) Security For some access channels, we can assume that the user is working inside of a corporate firewall, while other access channels are for requesters that are accessing these services over less secure wireless networks and the Internet Communication technology Different user devices use different communication technology, including standard protocols (eg, HTTP, Sockets, email, file transfer, Java RMI, CORBA) and proprietary protocols (eg, MS DCOM, WebSphere MQ, Tibco Rendezvous)
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Architecture for Multi-Channel Access
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Figure 5-3 shows a layered architecture for providing multi-channel access to business services
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Figure 5-3 Layered architecture for providing multi-channel access [View full size image]
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Client/Presentation Tier
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The role of the client/presentation tier is to accept user input and display the results of user interactions The myriad of end-user devices, form factors, connectivity options, user preferences, and client technologies ensures that the client/presentation tier will continue to be a source of technology diversity for years to come (see Figure 5-4)
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Figure 5-4 Client/presentation tier [View full size image]
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Channel Access Tier
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The role of the channel access tier is to mediate between the client applications and the business services (see Figure 5-5) For example:
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Figure 5-5 Channel access tier [View full size image]
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Support all common data formats and protocols Including SOAP, XML, name/value pairs, delimited format, fixed width format, Sockets, HTTP, FTP, SMTP, JMS, WebSphere MQ, Tibco Rendezvous, IIOP, and so on, so that a diverse set of clients can be easily supported Support all common communication interaction patterns Including request/response, request/callback, asynchronous messaging, and publish/subscribe so that a diverse set of clients can be easily supported Payload mapping Accept messages from clients in client-specific formats and automatically translate them into the enterprise message standard or the message format defined by the target business service Protocol bridging Receive messages on any transport being used by the client applications and automatically route them to the enterprise's middleware standard including WebSphere MQ, JMS, Tibco Rendezvous, HTTP/S, or CORBA IIOP Security facilities Support all major standards for security including encryption, integrity, authentication (eg, user name/password, HTTP Basic and Digest Authentication, X509 certificates, Kerberos security tokens, SAML), authorization (eg, role-based access control and digital rights management), and single sign-on Data transformation and validation For converting messages received from the client applications into the data formats required by the internal communication infrastructure Service lookup and service routing So that client requests can be routed to the services they require The service lookup facilities should support load balancing across service instances and service-level failover when a service fails