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Mobile Workers and Occasionally Connected Computing
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Dramatic advances in wireless connectivity and the availability of laptop computers and hand-held devices is sparking a mobile workforce revolution, which is prompting organizations to look for ways to improve the productivity of mobile workers Now, an entire population of sales representatives, consultants, field technical specialists, and other mobile workers carry computers as part of their jobs Here are some of the key challenges faced by organizations trying to improve the productivity of mobile users and untethered workers: Occasional connectivity because the worker may be outside of the range of the wireless network for hours or days In fact, the worker may spend more time disconnected from the network than connected to the network Temporary network failures due to unreliable network connections and spotty network coverage Multiple connection speeds as workers connect via broadband, Wi-Fi, and dial-up Because of these factors, it is difficult to extend existing business processes, enterprise applications, and web portals to the unique needs of mobile users and untethered workers Today, most applications for mobile users are designed with the assumption that they are wired into the network Switching to a connected/disconnected model, which today's hardware and wireless connectivity capabilities allow, causes these applications to show erratic behavior and does not support the users' requirements These applications also typically assume that the mobile user will rely on a thin clienta laptop application, like a Web browser or an email package, with limited functionalityfor all interactions with corporate IT systems Unfortunately, thin-client UIs are poorly suited to supporting mobile workers because they assume that all information can be accessed via a Web server A mobile worker needs the information stored on her laptop so that she can access it when she is not connected to the network Occasionally Connected Computing (OCC) refers to the technical infrastructure required to improve the productivity of mobile users and untethered workers Here are some of the key elements required for supporting OCC: Reliable, asynchronous messaging OCC requires reliable, guaranteed delivery of documents over potentially unreliable and intermittent connections Intelligent, adaptable messaging OCC solutions must be able to adapt their behavior in response to connection status and network speed Some issues include automatically starting data transfers when connections are detected, resuming unexpectedly interrupted data transfers, and throttling data transfers when network traffic is heavy Currently, none of the Web services standards address adaptive messaging Open standards Open standards are required for OCC because OCC solutions need to operate across a wide variety of public and private networks and need to interoperate with different products from different vendors Reliable messaging using SOAP over FTP or SOAP over SMTP combines open standards with the store-and-forward approach needed for OCC OCC solutions help mobile workers in the following ways:
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Reliable messaging is one of the cornerstones of SOA and BPM integration for mission-critical applications The various specifications for Web services advanced messaging (ebXML, WS-ReliableMessaging, WS-Reliability, WS-Eventing, and WS-Notification) offer solutions for most of the capabilities normally associated with reliable asynchronous message queuing and publish/subscribe solutions found in traditional middleware environments Both WS-Reliability and WS-ReliableMessaging lack many features provided by sophisticated products such as WebSphere MQ or MSMQ However, the reliable messaging specifications are not designed to replace these systems but rather to provide interoperability for Web services mapped to execution environments such as these Some of the missing capabilities are provided by other Web services specifications such as WS-Security, WS-Policy, and WS-Addressing
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10 Transaction Processing
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Transactions ensure that a group of Web services achieves a common result Web services often depend upon each other to complete a complex application request, such as updating a customer record (which might update multiple customer databases) or processing a purchase order (which might update multiple inventory management databases) Transactions use various protocols to ensure that the results of these interdependent services are formally coordinated so that when the failure of one service impacts the success of another, or of the composite application as a whole, the system handles it, rather than the application The relationship of a transaction to a Web service might be as simple as delegating a transaction to an existing transactional execution environment It may also be as complex as coordinating a single transaction across multiple participants in a long-running business process across arbitrary execution environments The various possible combinations of Web services within a transaction tend to require the use of multiple protocols and an external coordinator capable of bridging disparate execution environments Transactional protocols work with reliable messaging and security technologies to help ensure predictable and safe operations on data Transaction messages can be sent reliably, and it may be important to secure the transaction-processing infrastructure to protect against unwanted results Especially when coordinating transactional operations across the Internet, it may be necessary to guard against false commit or rollback messages, for example Implementations of transaction processing technologies range from synchronous messaging systems using remote procedure calls (RPCs), to asynchronous message queuing systems, to long-running business process management solutions Transaction management technologies are present in TP (transaction processing) monitors, application servers, database management systems, and packaged applications Web services transactions may need to work with any, all, or any combination of these systems Web services transaction technologies are really only necessary when interoperability requirements include transactions; therefore, when a Web service accesses only a single transactional execution environment, Web services transaction technologies aren't needed Web services-based interoperability presents significant challenges for transaction processing systems because their loosely coupled interfaces can be mapped to widely disparate systems with widely different transaction protocols and models Yet those widely disparate systems, when used in combination with Web services, are still usually expected to reliably return predictable results to the people who use them and the businesses that rely upon them, regardless of operating system, hardware, network, or application failures Transactions therefore represent a key aspect of Web services for SOA-based applications
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