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probably in the form of an address, rather than numerically; Bluetooth already supports the idea of location beacons where are my colleagues/family/friends asset tracking: as well as family and friends, non-human assets can be tracked, such as pets or vehicles; this is either for protection against theft or for management location-based to-dos : remind me when I am near home/passing the dry-cleaners/next in Cambridge or when I am near a colleague (this is more challenging because both target and user are mobile) location stamping (like time stamping) of user data. Knowing where a data item was created will help with searching and sorting photos, video recordings, voice recordings, etc.; for instance, I could quickly search for all photos of Niagara Falls. Logging calls and messages with a location as well as a time makes them easier to identify and check: oh yes, I did make that one hour call to Beijing from the Eiffel Tower . However, there is a danger that the LBS market could fail to achieve its potential if mobile phone manufacturers or operators try to control access to such services. Symbian is taking an agnostic approach to implementing support for location-based services (see Figure 8.8). Symbian s design means that any location-based service, whether supplied by an operator, a mobile phone manufacturer or a third party, can use any available acquisition technology (A-GPS, translated Cell ID,
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Route planning Buddy finder JSR179 Location Location services
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Figure 8.8 Symbian s approach to location-based services.
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etc.). Further the service is unaware of whether data such as named landmarks or privacy lists are stored on the network, the mobile phone, or both. Crucially Symbian s implementation of the Location Services API for J2ME (JSR 179) also makes use of this underlying exibility.
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Sections 8.3 and 8.4 looked at the market segments and opportunities for consumer and enterprise services and identi ed important market requirements. Let us look at the principal bene ts of the Java language for services development and how these meet market needs: security: services and applications cannot be subverted standardization: more developers and tools mean that more services can be developed robustness: fewer faults, fewer recalls fast development: faster time-to-market ease of porting: service providers can deploy on as many mobile phones as possible.
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Wireless services depend on the secure delivery of trusted applications and the secure exchange of information. Security was, and is, one of Java s critical design goals and it is built into Java from the ground up. Features such as the bytecode veri er, preventing random memory accesses and disallowing inappropriate casting, ensure that Java can be used to develop secure systems. Achieving the same watertight security with other languages is much harder. The absence of pointers and the use of Array objects means that Java code cannot point to either a non-existent object or to the wrong sort of object. It is too easy in C++ code to write or read from an incorrect area of memory (e.g. off the end of an array). The real problem is that the mistake will not be identi ed immediately, but can generate apparently unrelated misbehavior, frequently a crash, hours or even months later. If a Java application attempts to access an inappropriate object or a nonexistent element in an array, an exception will be thrown immediately that identi es both the cause of the problem and where in the source code the problem occurred. Java s automatic garbage collection results in fewer, or no, memory leaks. In C++, we must be careful to match object construction with object destruction: failing to destroy an object results in a memory leak
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and attempting to destroy an object twice will cause the program to crash. (As in C++ we must ensure that our Java code does not keep hold of references to unwanted objects; such objects cannot be garbage collected and will effectively cause a memory leak.)
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