Abstract
Both wireless sensor networks and service-oriented architectures (SOA) are very popular distributed computing paradigm. Web service is a widely accepted implementation of SOA. However, web service is based on Internet protocols and requires adaptation to suit the restrictions posed by WSNs. The development of Internet of Things has triggered research of web services of WSNs which made the consolidation of these technologies possible. At the same time, web service integration enables the support of more functionalities since many applications rely on not just one web service, but a whole school of them. Thus, how to compose and integrate different web services efficiently to provide complicated services becomes an essential topic. This paper investigates a problem which minimizes the number of hops of web services while integrating these web services to finish a set of tasks. We call this problem Minimum Hops of Service Integration Problem. It is proved that, when there are no precedence relationships between the tasks, the decision problem is NP-complete. This implies that this web services integration problem is NP-hard. For the case when the relationships between the tasks are in linear order, a polynomial-time, optimal web service integration algorithm, using greedy strategy, is provided.
Highlights
Wireless sensor networks (WSNs) are used to monitor the concerned events through the collaboration between sensor nodes via wireless communication [1,2,3]
We propose a novel problem of web service integration, that is, how to integrate the existing web services in order to satisfy a pool of tasks and, at the same time, to minimize the web service hop count with the preliminary work published in [27]
This work concerns the problem of web service integration for WSNs; jobs consist of many tasks which are assigned to different web services over the network for execution
Summary
Wireless sensor networks (WSNs) are used to monitor the concerned events through the collaboration between sensor nodes via wireless communication [1,2,3]. Following the trend of complicated application requirements and the fast advancement of Internet technologies, the issue with applying web services is not just how to find a single web service which can accomplish one single function. We propose a novel problem of web service integration, that is, how to integrate the existing web services in order to satisfy a pool of tasks and, at the same time, to minimize the web service hop count with the preliminary work published in [27] This problem plays important roles when the response time is an important factor in evaluating the performance of the applications.
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