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Table 11.2 Database Pointbase
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Small footprint databases Description An all-Java database with a footprint of 45 kilobytes that is designed to fit into CLDC and CDC devices, as well as run in the J2SE environment. Pointbase is available from Pointbase, Inc. More information can be found at their website, www.pointbase.com. An all-Java database that works as both a relational database and an object database. Although this database ships with the J2EE it can be used within a more constrained environment such as J2ME. Cloudscape is owned by IBM. More information can be found at their website, www.cloudscape.com. A small footprint database provided by Sybase. More information can be found at their website, www.sybase.com/products/mobilewireless/anywhere. A small footprint version of Oracle. More information can be found at their website, www.oracle.com/ip/deploy/database/8i/8ilite.
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Regardless of how data is stored on the device there will be a data mapping issue that needs to be dealt with for moving data over a network connection. Unless there is a JDBC driver that can run over your network connection, the data from the external system needs to be mapped into the network transmission format and then mapped from that format into the device s internal storage format. Simply running an RDBMS on both the J2ME client and the server (or other system) may not relieve you of this mapping task since the network format sits in between the two databases. Another item to consider is that some database products, such as Cloudscape and Pointbase, offer data synchronization features and complementary products to help keep the device data and the server data synchronized. This solves the network data format issues automatically. 11.3.6 Memory How memory is allocated and utilized varies between devices. In the J2ME device space, the familiar notion of runtime memory (RAM) and disk capacity as it is understood on desktop and laptop systems usually does not hold for the simple reason that many J2ME devices do not have a hard disk. In fact, many do not support a file system. In many cases, the runtime memory and the storage memory are simply partitions of the same memory resource, such as Flash Memory. Devices running Palm OS, for example, partition memory into two heaps, the dynamic heap, and the storage heap. The dynamic heap is used for application runtime. The contents of this memory partition do not survive a device reset. The storage heap is used for persistent data storage. The contents of this memory partition will survive a device reset (excluding a hard reset which will revert the device to its original manufacturer settings). Understanding how memory is utilized on your target devices becomes important since your application must fit into the memory constraints of each device as well as stay within the storage limitations of the devices. For example, if your target devices support 8 MB of memory you cannot assume that all the memory is available to your application. You are sharing it with other applications stored on the device as well as
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the data of other applications. In many cases, the amount of runtime memory is significantly less than the total memory. On a PalmVx, which has 8 MB of memory, the runtime heap is allocated 256 KB. If networking is enabled, this consumes an additional 32 KB of this space. The KVM requires as much as 80 KB of runtime memory. This leaves less than 144 KB of runtime memory available for your application. Since the memory limitations are likely to vary across a set of target devices, you are forced to develop your application to the lowest common denominator or alter functionality based on memory constraints. In many cases, memory issues can be managed within an application using programming techniques. For example, when uploading data to the device, rather than holding the data in memory until the transmission is complete, the data could be immediately written to memory. In general, this is a good programming practice to follow. Another important issue to consider with J2ME applications is to create as little garbage for the garbage collector as possible. There are two reasons for this. First of all, creating a lot of garbage incurs a lot of work for the garbage collector. The garbage collector steals processing power from the application in order to run. Second of all, J2ME garbage collectors vary in their implementation and some are better than others. If the garbage collector cannot effectively clean up memory you will have memory leaks robbing you of precious runtime memory. Therefore, it is important to pay attention to how you use memory in operations and what is happening behind the scenes in the virtual machine. For example, if you need to dynamically build a String, you are better off assembling the String using StringBuffer.append() than concatenating String objects using += (e.g, s += append to end ). This is because String is immutable and each concatenation actually creates a new String object that combines the two concatenated String objects. StringBuffer, on the other hand, allows its contents to be changed, thus fewer objects are created in the string assembly process. 11.3.7 Portability between profiles In general, there are three main areas of functionality that networked device applications need to consider: user interface, data storage, and network connectivity. Since network connectivity is supported at the configuration layer by the generic connection framework, network connectivity is likely to be the most portable of the three. Data storage can vary since some devices only support byte arrays while others have file systems or can run a relational database. The user interface is quite vulnerable; however, the architecture of J2ME is set up to reduce inconsistencies between user interface APIs. The key issues with user interface portability have to do with managing a consistent set of GUI widgets, a consistent method of laying out components, and a common event model. While the types of GUI widgets may vary between J2ME profiles, it is likely that J2ME will maintain consistency in widgets between profiles. For example, if two profiles support a TextField component, the method signatures and behavior of the component can be similar, even if the implementation on the profile needs to change. This reduces a significant amount of rewriting between profiles.
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