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Smart Client Architecture and Design Guide
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Summary
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Smart clients need to access resources, both local and remote, to function. How you handle this communication can be critical to your success in designing smart clients that are reliable and responsive to the user. Requirements such as performance, security, and flexibility affect what the appropriate connectivity choice is for your environment. Using the guidance in this chapter, you should determine which forms of connectivity are right for your smart clients, and then design your smart clients and the resources with which they communicate accordingly.
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Occasionally Connected Smart Clients
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We live in an increasingly connected world. However, in many cases we cannot rely on connectivity 100 percent of the time. Your users may travel, they may temporarily lose wireless connectivity, there may be latency or bandwidth problems, or you may need to take down parts of the network for maintenance. Even if users do have good network connectivity, your applications may not be able to access network resources all of the time. A requested service could be busy, down, or just temporarily unavailable. An application is occasionally connected if at times it cannot interact with services or data over a network in a timely manner. If you can allow your users to be productive with their applications when they are offline, and still provide them with the benefits of a connected application when the connection is working, you can increase user productivity and efficiency and increase the usability of your applications. One of the primary benefits of smart clients over Web-based applications is that they can allow users to continue working when the application cannot connect to network resources. Occasionally connected smart clients are capable of performing work when not connected to a network resource and then updating network resources in the background at a later time. The update may happen almost immediately, but sometimes it can happen days or even weeks later.
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Smart Client Architecture and Design Guide
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To given an application full occasionally connected capabilities, you need to provide an infrastructure that allows users to work when they have no connection to network resources. This infrastructure should include data caching, so that all required data is available on the client, and storage of the details of users work, which can be used to synchronize the client and network resources when the user goes back online. The exact features and capabilities that your application needs to support occasionally connected operations depends on its connectivity, operational environment, and the functionality that the user expects when online and offline. However, all smart client applications should provide some sort of experience for the users when not connected to the network, even if the functionality is extremely limited. When designing and building your applications, you should always avoid generating error messages on the client because a server is not available. This chapter looks at the issues that you face as you build applications with offline capabilities. It reviews different strategies for designing offline applications, discusses in detail design considerations, examines how to structure applications to use tasks, and looks at how your applications should handle data.
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Occasionally connected smart clients are extremely useful in many common situations. Many offline scenarios involve the user explicitly disconnecting from the network and working without a network connection, for example: An insurance agent may need to create a new insurance policy while out of the office. He or she may be required to enter all the relevant data, calculate premiums, and issue policy details without being able to connect to the systems in the office. A sales representative may need to place a large order while on site with the customer, where the representative cannot connect to the server. He or she may need to consult price lists and catalog information, enter all order data, and provide estimates of delivery and discount levels without having to connect. A maintenance technician may require detailed technical information while attending to a service call at a client s site. The application helps him or her to diagnose the problem, provides technical documentation and details, and allows the technician to place an order for parts and to document his or her actions without having to connect.
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