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J2ME: The Complete Reference
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Geographic positioning systems in a mobile small computing device detect the location of the device, enabling the operating system to make time zone adjustments
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As discussed at the beginning of this chapter, a small computing device is typically used to store and manipulate data that changes over time, such as a list of clients and financial records Storage of data in a small computing device is temporary because the device usually doesn t have secondary storage All data is stored in primary storage (memory) and can be lost whenever the device loses power Data is permanently stored in secondary storage on a traditional computing device such as a desktop computer or server Therefore, it is critical to the success of your application that you provide a mechanism to efficiently update data in the small computing device with data stored on the traditional computer s secondary storage
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J2ME Best Practices and Patterns
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Failure to do this will cause both devices to become unsynchronized, resulting in erroneous data being displayed and manipulated by the small computing device A good practice is to build into your J2ME application a routine that automatically uploads the latest data when the J2ME application is invoked Likewise, your J2ME application should automatically download data that has changed to the secondary storage device prior to the termination of the application The small computing device must be connected to the network for both actions to occur It is common for the device to automatically log onto the network when the device is activated However, some devices might require the user to log onto the network If the user doesn t log onto the network, your application is unable to update data in the small computing device with data stored in the secondary storage device A good practice is to prompt the user to open a network connection while your J2ME application begins running or right before the application terminates The prompt should give the user two choices: open a network connection or skip opening a network connection until the next time the J2ME application is opened The prompt should also explain that if the user postpones opening a network connection, the data retained in the small computing device might become outdated and might be lost should the device lose power
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Keep in mind that synchronizing data can be a time-consuming process, depending on the speed of the network connection and the amount of data that is being updated Therefore, you should balance the response time of your application with the need to retain updated data Data can become outdated in two ways: when data changes on the small computing device and when data changes on the secondary storage device, which is usually the server A good practice is to offer the user of your application three options for updating data: incremental updates, batch updates, and full updates Incremental updates require an exchange of data to occur whenever data changes, either on the small computing device or on the secondary storage device And only the changed data is exchanged between devices Performance decreases as the number of incremental data changes occur because the changed data is transmitted following the modification of the data The batch update option eliminates the need for incremental updates by updating a batch of data either periodically or on demand, controlled by the user of the application A batch update only transmits data that is changed by either the small computing device or the secondary storage device For example, you might design the application to automatically send a batch when the application begins, terminates, or during an idle period when the application runs Likewise, you should offer the user an option that enables a manual transfer of modified data as a way for the user to back up changes to the data
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