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J2ME: The Complete Reference
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The question that you re bound to be asking is what constitutes a short or long list of items You ll need to test your application loading the list once and then loading the list dynamically for each invocation to determine which method delivers the best performance Be sure to test in real-world conditions when loading a list from a server Any processing delay by the server responding to a request for the list can severely impact your application s user response time Likewise, transmission delays will also deliver a negative user experience with your application In contrast, caching a long list limits memory availability to other routines within your application and to other applications running on the small computing device This might result in some features of your application becoming unavailable or worse a user won t be able to load another application if your application is loaded in memory
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Developing a J2ME application is a balancing act between deciding whether processing should be performed by the small computing device or by a server The choice depends upon many factors, including the amount of transmission that must occur for each process A good practice is to off-load as much processing as is reasonable to a server and minimize the number of processes that need to be invoked by the J2ME application in order to reduce network transmissions Collect all the information from the user that is required by the process at one time, and then forward the information to the server when invoking the process For example, your application might be used to retrieve a list of customers that the user may later filter to remove unwanted customers or reorder the customer list into a more appropriate sequence You can reduce the number of processes and network transmission by requiring the user to select the filter and sequence as part of the request for the customer list (Figure 4-7) In this way, the database server can create the customer list in the desired order without having the user make subsequent requests to manipulate the customer information
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J2ME applications that rely on current time might incur a problem that is not realized in desktop computer and server applications Current time is determined by the date/ time setting on the device Desktop computers and servers are stationary, and therefore current time reflects the time zone where these devices are located However, the same isn t true of a mobile small computing device because the device can be moved to multiple time zones The problem of time-sensitive data is further compounded by the fact that the date/ time setting is device dependent For example, a number of cellular telephones have a geographic positioning feature that enables the device s operating system to know the exact location of the device Some geographic positioning systems use a global position system (GPS) that pinpoints the device by triangulating satellite-transmitted signals Other
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Let the business logic layer filter and sort data rather than filtering and sorting data in the small computing device
geographic positioning systems determine a device s time zone based on the cellular telephone network s cell that receives the device s transmission (Figure 4-8) Those mobile small computing devices that have a built-in geographic positioning system typically adjust the date/time setting on the device automatically as the device moves to a new time zone However, not all mobile small computing devices have a geographic positioning system on board (for example, PDAs) and therefore rely on the user to adjust the date/time setting when crossing into another time zone Unfortunately, there isn t any practice that guarantees a user will adjust the date/ time setting to reflect the current time zone, although you can remind the user of the importance of making such an adjustment Knowing the time zone used when the timesensitive data was entered into your J2ME application is critical when analyzing the data For example, the data might be time stamped 9:30 AM, but you still need to know the time zone in order to properly evaluate the time the data was entered into your application The best practice is to always store time based on Greenwich Mean Time (GMT) by using the getTime() method of the Date class In this way, the time stamp of all the data is recorded in a uniform time zone, facilitating the data analysis
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