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(Of course, this is fairly heavy going for an operation such as credit, and even more heavy going for something like getBalance) Entity beans are supposed to improve the efficiency of program developers A developer doesn t need to bother with transactional details; the container handles these A developer doesn t have to include access control code to check on the identity of a user; standard access control code is built into the container Other extensions to entity beans may further enhance the productivity of developers These extensions include support for handling relations among entities, and in the case of CMP beans there is the feature of automatic generation of most of the database access code Relations among entity beans deal with things like an order entity and its associated items (items might be represented as entity beans, but a simpler class would possibly suffice).

1 J Hoebeke, I Moerman, B Dhoedt, and P Demeester An overview of mobile ad hoc networks: Applications and challenges, The Journal of the Communications Network, vol 3, no 3, pp 60 66 2 Merrian Webster Online Dictionary; wwwm-wcom (accessed 5 February 2005) 3 Huang, Crowcroft, and Wassell, Rethinking incentives for mobile ad hoc networks, SIGCOMM 04 Workshops, pp 191 196 4 N Abramsson The ALOHA system another alternative for computer communications, in AFIPS Conf Proc, vol 37, FJCC, 1970, pp 695 702 5 M Frodigh, P Johansson, and P Larsson, Wireless ad hoc networking the art of networking without a network, Ericsson Review, vol 4, 2000, pp 248 263 6 S Korotygin Development of wireless network technologies: IEEE 80211 standard ; wwwdigit-lifecom/articles/wlan/indexhtml (accessed 18 February 2005) 7.

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The order would have data members such as order-identifier, customer name and address; these would correspond to fields in an order table The items would have item codes and quantities; again these would map to fields in an item table The order entity bean would probably own a collection of items (implemented as an ArrayList or something similar) The database representation of this relationship would mostly likely be achieved by the item table having a foreign key field for the identifier of the order of which an item is a part When an order bean is reinstantiated, all its associated items should also be recreated There are coding styles proposed for implementing relations in BMP beans; CMP beans can use declarative descriptions of such relationships, and sort things out for themselves through the automatically generated code Relations and CMP styles are illustrated by other examples in Sun s tutorial.

N OT E The names of datatypes and elements in this appendix will be expressed as QNames, such as xsd:string, indicating that the type (or element) is in the namespace of W3C XML Schema. An appropriate namespace declaration will be assumed to apply.

While these features for the standardization of processing and the automation of coding are helpful, they do come at a cost The generalized mechanisms used with entity beans tend to hammer the database, requiring many more accesses than would more na ve coding in helper beans that are hard-coded to run within a servlet container A developer creating such a helper bean would probably implement something like the credit operation via an SQL update statement such as update savingsaccount set balance = balance + where id = This operation would be less costly than the EJB s transactional group of operations: reload bean, change field, update entire row.

Shi et, Belding-Royer, and Perkins, Address aggregation in mobile ad hoc networks, IEEE Communications Society, 2004, pp 3734 3738 8 P Samar and Z Haas, Strategies for broadcasting updates by proactive routing protocols in mobile ad hoc networks, MILCOM 2002 Proceedings, vol 2, 2002, pp 873 878 9 L De Nardis, G Giancola, M-G Di Benedetto, A power-ef cient routing metric for UWB wireless mobile networks, Vehicular Technology Conference, vol 5, October 2003, pp 3105 3109 10 C E Perkins and P Bhagwat, Highly dynamic destination sequenced distance-vector routing (DSDV) for mobile computers, Proceedings of the SIGCOMM 94 Conference on Communications Architectures, Protocols and Applications, August 1994, pp 234 244; available at http://peoplenokianet/$charliep/ (accessed 19 February 2005) 11 J Broch, D A Maltz, D B Johnson, Y-C Hu, and J.

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