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See "Extension Object" in R Martin, Pattern Languages of Program Design 3 Addison-Wesley, Reading, MA, 1998 For a comprehensive description with several other implementation variations, see "Extension Interface" in D Schmidt, M Stal, H Rohner, F Buschmann, Pattern-Oriented Software Architecture Volume 2: Patterns for Concurrent and Networked Objects John Wiley & Sons, 2000 When implementing Extension Object, you have to answer several questions:

Therefore careful selection of the base-station location may affect various performance metrics such as energy consumption, delay, and throughput Unlike sensors deployment, positioning of the base stations can be somewhat controlled and is feasible in many application setups Optimal node placement is a very challenging problem that has been proven to be NP-complete for base stations [7] and for most of the formulations of sensors deployment [8 10] To tackle such complexity, several heuristics have been proposed to nd suboptimal solutions [7, 11 14] However, the context of these optimization strategies is mainly static in the sense that assessing the quality of candidate positions is based on structural quality metric such as distance, network connectivity, and/or basing the analysis on a xed topology Therefore, we classify them as static approaches.

In the past this investment has shown a relatively moderate range of price fluctuations relative to other investments This investment may experience larger or smaller price declines or price increases depending on market conditions Some of this risk may be offset by owning other investments with different portfolio makeups or investment strategies

Do you want to extend an individual object or a class With a class-based mechanism you add behavior to an entire class You can only add behavior but not state, that is, no fields How is an extension described and identified

We note, however, that dynamically adjusting nodes location can further increase the dependability of WSNs since the optimality of the initial positions may become void during the operation of the network depending on the network state and various external factors For example, traf c patterns can change based on the monitored events, load may not be balanced among the nodes causing bottlenecks, application-level interest can vary over time, and the available network resources may change due to the depletion of energy of some nodes and/or the addition of more nodes In this chapter we opt to categorize the various strategies for statically positioning base stations and sensor nodes in WSNs We contrast a number of published approaches highlighting their strengths and limitations Our aim is to help applications designers identify alternative solutions and select appropriate strategies.

In addition to surveying static positioning approaches, we show that dynamically repositioning nodes while the network is operational can be a very effective means for boosting the network s dependability attributes We describe scenarios for which node relocation can be pursued to counter holes in coverage, achieve/maintain strong network connectivity, preserve sensor s energy, increase data timeliness, and boost the node s physical security We highlight the issues, report on the state of the art, and outline open esearch problem The chapter is organized as follows The next section is dedicated to static strategies for node positioning We separately cover approaches for sensor placement as well as single and multiple base stations positioning In Section 93 we turn our attention to dynamic positioning schemes We highlight the technical issues and describe sample techniques that exploit sensors and base-station repositioning to enhance the network dependability.

The Eclipse extension support is class-based That is, you can add behavior to existing classes, but not add state to its existing instances The additional behavior is described by an interface The key interface of the Eclipse extension support is IAdaptable Classes that support adaptability implement this interface While browsing the Eclipse source, you will find that IAdaptable is a popular interface, as illustrated in the following snapshot of the Hierarchy view shown in Figure 313

The bulk of the discussion applies to a single base-station setup or to.

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What is behind the IAdaptable name When doing some Eclipse code archeology we found the class was originally called IExtensible This captured the idea that the mechanism existed to support extending a type with additional behavior Over time the name got changed to IAdaptable to emphasize the fact that the mechanism enables adapting an existing class to another interface IAdaptable is an interface with a single method that allows clients to dynamically query whether an object supports a particular interface: