Distributed Web Services Discovery Middleware for Edges of Internet
2010 IEEE International Conference on Web Services
The advent of mobile computing devices and development of wireless and ad hoc networking technologies as Bluetooth, RFID etc has led to the growth of infrastructure-less pervasive environments. Most often, these environments lie at the edges of Internet, i.e., they are disconnected or sparsely connected to rest of the world. In order to exploit the access to such edges of Internet, an interoperability middleware, capable of dealing with lack of communication infrastructure, is needed. In this
... per, we propose a solution that synergizes P2P technology, message queuing support and a passive distributed UDDI to exploit Web services in infrastructure-less edges of Internet. We abstract communication heterogeneity and prove that passive communication mode performs better than active mode of communication (i.e., existing solutions in literature) in terms of Web services discovery. I. We can observe that, even with a higher robot-RFID cluster ratio, the rise in number of disseminated messages in passive communication mode is better to that of active communication mode. If RFID/MR memory size is increased, passive communication mode with a higher Robot-RFID cluster ratio as compared to that of active communication mode in same setting gives better results. This is shown in the overlap of "Active Mode -average msgs with RFID memory = 3" over "Passive Mode -Average msgs with RFID memory = 6". In other words, passive mode of communication is less bandwidth intensive even when a higher Robot-RFID cluster ratio is used. Results reveal that passive communication mode exhibits controlled losses even with increased robot-RFID cluster ratio. With a higher RFID memory the results of passive communication mode improves further as compared to that of active communication mode. Active communication mode on the other hand incurs more losses with higher robot-RFID cluster ratios. stale information in service cache effects additional number of hops across clusters for service discovery. E. Overall analysis Experimental results reveal the effectiveness of passive mode over active mode of communication. Active mode of communication (as employed in literature) gives result in number of discoverable services, however it does not fare well in terms of conflicts, higher robot-RFID cluster ratio and message re-request overhead. Moreover last result validates the improvements in service discovery and invocation of passive mode augmented with semantic discovery. VI. CONCLUDING REMARKS This paper gave a detailed evaluation of a passive distributed UDDI, a loosely coupled distributed UDDI solution for infrastructure-less communicating and heterogeneous systems. We proved, with the help of extensive experiments, that passive mode of communication performs considerably better than active mode of communication (i.e., existing solutions in literature) in terms of Web services discovery.