Abstract Web services play an important role in the development of distributed systems. Particularly, the possibility of composing already implemented web services in order to provide new functionalities is an interesting approach for building distributed applications and business processes. In this paper we focus on mismatches occurring during dynamic composition of web services. We propose an algorithm for dynamic and automatic... Web services play an important role in the development of distributed systems. Particularly, the possibility of composing already implemented web services in order to provide new functionalities is an interesting approach for building distributed applications and business processes. In this paper we focus on mismatches occurring during dynamic composition of web services. We propose an algorithm for dynamic and automatic composition and adaptation of web services. Our approach only uses the information that is already available in service interface descriptions. The algorithm allows programmers to define dynamic web service compositions without changing the source code. Read More Read Less

Abstract The composition of heterogeneous Web services is a key aspect of usability and applicability of Web services in different application domains such as business applications, healthcare, and e-government. Unfortunately, the reuse of Web services raises composition issues since they present, most of the time, mismatching at different levels such as structural, behavioral and non-functional. The resulted mismatches require adaptation to... The composition of heterogeneous Web services is a key aspect of usability and applicability of Web services in different application domains such as business applications, healthcare, and e-government. Unfortunately, the reuse of Web services raises composition issues since they present, most of the time, mismatching at different levels such as structural, behavioral and non-functional. The resulted mismatches require adaptation to insure the correct working between Web services. This paper presents an effective adaptive Web service composition. It gives especially a formal specification of operations which enable to compose and adapt services at runtime. This specification is given in Maude language as a logical framework. Thanks to many Maude tools, formal analysis may be easily performed Read More Read Less

Abstract One of the most important operation in Internet, is the discovery of web services, because of the increasing use of this technology in the last years, as well as, Cloud computing technology is becoming the new way to conceive applications in the network, due to the capacity of treatment and storage offer by the Cloud based systems. In this work... One of the most important operation in Internet, is the discovery of web services, because of the increasing use of this technology in the last years, as well as, Cloud computing technology is becoming the new way to conceive applications in the network, due to the capacity of treatment and storage offer by the Cloud based systems. In this work we propose, new web services discovery architecture based agents in open cloud computing federation. More accurately, we propose a new algorithm of comparison between the request of the client and the description of the Web services, this algorithm aim to select and rank the discovered web services to give more precision to the web services that the system return to the client. The proposed system is composed of two areas of Cloud. The first deals with Key words based research and the second supports the filtering of the found web services based on a new matching algorithm for web services selection. The results show the efficacy of the proposed architecture in the optimization of the quality of service (QoS) (the response time in our case) due to, on the one hand, our v our virtualization policy, and the use of mobile agents to maximize the exploitation of the Cloud computing resources. Read More Read Less

Abstract This paper presents a novel evaluation study of various strategies for modeling and simulating cloud computing systems in order to assess their performance. Considering the exponential growth in the deployment of cloud computing systems worldwide and the need for their proper evaluation, this work provides three major contributions through comprehensive performance evaluations. Firstly, it proposes a novel 10-point performance evaluation... This paper presents a novel evaluation study of various strategies for modeling and simulating cloud computing systems in order to assess their performance. Considering the exponential growth in the deployment of cloud computing systems worldwide and the need for their proper evaluation, this work provides three major contributions through comprehensive performance evaluations. Firstly, it proposes a novel 10-point performance evaluation framework for existing Cloud Storage infrastructure and applies it for evaluating major Cloud Storage Service Providers. Secondly, it presents a detailed evaluation of 18 most popular Cloud Storage Hardware vendors with respect to the storage technologies they incorporate. Thirdly, it provides a comprehensive survey of prominent simulation tools which are used for simulation and modeling of Cloud Computing systems. In conclusion, it takes stock of the current trends on optimizing storage infrastructure for Cloud Computing and predicting future research possibilities in this rapidly growing technology. Read More Read Less

Abstract Web services play an important role in the development of distributed systems. Particularly, the possibility of composing already implemented web services in order to provide new functionalities is an interesting approach for building distributed applications and business processes. In this paper we focus on mismatches occurring during dynamic composition of web services. We propose an algorithm for dynamic and automatic composition and adaptation... Web services play an important role in the development of distributed systems. Particularly, the possibility of composing already implemented web services in order to provide new functionalities is an interesting approach for building distributed applications and business processes. In this paper we focus on mismatches occurring during dynamic composition of web services. We propose an algorithm for dynamic and automatic composition and adaptation of web services. Our approach only uses the information that is already available in service interface descriptions. The algorithm allows programmers to define dynamic web service compositions without changing the source code. Read More Read Less

Abstract The composition of heterogeneous Web services is a key aspect of usability and applicability of Web services in different application domains such as business applications, healthcare, and e-government. Unfortunately, the reuse of Web services raises composition issues since they present, most of the time, mismatching at different levels such as structural, behavioral and non-functional. The resulted mismatches require adaptation to insure the correct... The composition of heterogeneous Web services is a key aspect of usability and applicability of Web services in different application domains such as business applications, healthcare, and e-government. Unfortunately, the reuse of Web services raises composition issues since they present, most of the time, mismatching at different levels such as structural, behavioral and non-functional. The resulted mismatches require adaptation to insure the correct working between Web services. This paper presents an effective adaptive Web service composition. It gives especially a formal specification of operations which enable to compose and adapt services at runtime. This specification is given in Maude language as a logical framework. Thanks to many Maude tools, formal analysis may be easily performed. Read More Read Less

Abstract One of the most important operation in Internet, is the discovery of web services, because of the increasing use of this technology in the last years, as well as, Cloud computing technology is becoming the new way to conceive applications in the network, due to the capacity of treatment and storage offer by the Cloud based systems. In this work we propose,... One of the most important operation in Internet, is the discovery of web services, because of the increasing use of this technology in the last years, as well as, Cloud computing technology is becoming the new way to conceive applications in the network, due to the capacity of treatment and storage offer by the Cloud based systems. In this work we propose, new web services discovery architecture based agents in open cloud computing federation. More accurately, we propose a new algorithm of comparison between the request of the client and the description of the Web services, this algorithm aim to select and rank the discovered web services to give more precision to the web services that the system return to the client. The proposed system is composed of two areas of Cloud. The first deals with Key words based research and the second supports the filtering of the found web services based on a new matching algorithm for web services selection. The results show the efficacy of the proposed architecture in the optimization of the quality of service (QoS) (the response time in our case) due to, on the one hand, our v our virtualization policy, and the use of mobile agents to maximize the exploitation of the Cloud computing resources. Read More Read Less

Abstract This paper presents a novel evaluation study of various strategies for modeling and simulating cloud computing systems in order to assess their performance. Considering the exponential growth in the deployment of cloud computing systems worldwide and the need for their proper evaluation, this work provides three major contributions through comprehensive performance evaluations. Firstly, it proposes a novel 10-point performance evaluation framework for existing... This paper presents a novel evaluation study of various strategies for modeling and simulating cloud computing systems in order to assess their performance. Considering the exponential growth in the deployment of cloud computing systems worldwide and the need for their proper evaluation, this work provides three major contributions through comprehensive performance evaluations. Firstly, it proposes a novel 10-point performance evaluation framework for existing Cloud Storage infrastructure and applies it for evaluating major Cloud Storage Service Providers. Secondly, it presents a detailed evaluation of 18 most popular Cloud Storage Hardware vendors with respect to the storage technologies they incorporate. Thirdly, it provides a comprehensive survey of prominent simulation tools which are used for simulation and modeling of Cloud Computing systems. In conclusion, it takes stock of the current trends on optimizing storage infrastructure for Cloud Computing and predicting future research possibilities in this rapidly growing technology. Read More Read Less