{"title":"Evaluating the compatibility of conversational service interactions","authors":"Sam Guinea, P. Spoletini","doi":"10.1145/1985394.1985399","DOIUrl":"https://doi.org/10.1145/1985394.1985399","url":null,"abstract":"Service-oriented systems live in an open world, one in which their functionality and quality of service depend on how the services they interact with evolve. System adaptation has been indicated as a way to cope with the evolution these partner services may have. When a partner does not behave as expected, in an adaptable system we can substitute it with an alternative compatible one. Finding a compatible alternative, however, is a difficult task if we consider conversational services that impose a specific interaction protocol and specific data-types. In this paper we introduce Interaction Sequence Charts (ISC) as an effective notation for describing the interactions a service has with its partners, and an algorithm that uses these charts to establish a \"degree of compatibility\" between interacting services. The algorithm considers both interaction protocol requirements and datatype similarity, for which fuzzy techniques are adopted. The expressive power of ISC is validated by using it to describe the complex behaviour that can be defined using BPEL 2.0, while the algorithm is validated on an example in the field of Tele-Radiology, and shown to be advantageous in practice.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133029739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Engineering multi-tenant software-as-a-service systems","authors":"Bikram Sengupta, Abhik Roychoudhury","doi":"10.1145/1985394.1985397","DOIUrl":"https://doi.org/10.1145/1985394.1985397","url":null,"abstract":"Increasingly, Software-as-a-Service (SaaS) is becoming a dominant mechanism for the consumption of software by end users. From a vendor's perspective, the benefits of SaaS arise from leveraging economies of scale, by serving a large number of customers (\"tenants\") through a shared instance of a centrally hosted software service. Consequently, a SaaS provider would, in general, try to drive commonality amongst the requirements of different tenants, and at best, offer a fixed set of customization options. However, many tenants would also come with custom requirements, which may be a pre-requisite for them to adopt the SaaS system. These requirements should then be addressed by evolving the SaaS system in a controlled manner, while still supporting the needs of existing tenants. This need to balance tenant variability and commonality, and to optimize on development and testing effort, can make the evolution of multitenant SaaS systems an interesting engineering challenge; this has strong economic undertones as well, given the \"pay-per-use\" subscription model of SaaS, and the cost of incremental development and maintenance to cater to new tenant needs. In this paper, we outline a set of research issues in the design, testing and maintenance of multi-tenant SaaS systems, and highlight some of the interesting optimization questions that arise in the process. Presenting specific technical solutions is beyond the scope of this paper - instead, our goal is to help shape a research agenda for multi-tenant SaaS that can provide stimulus for further investigation into this area by the software and service engineering research community.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130555031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Identifying, modifying, creating, and removing monitor rules for service oriented computing","authors":"Ricardo Contreras, A. Zisman","doi":"10.1145/1985394.1985401","DOIUrl":"https://doi.org/10.1145/1985394.1985401","url":null,"abstract":"Monitoring of service-based systems is considered an important activity to support service-oriented computing. Monitoring can be used to verify the behavior of a service-based system, and the quality and contextual aspects of the services participating in the system. Existing approaches for monitoring service-based systems assume that monitor rules are pre-defined and known in advance, which is not always the case. We present a pattern-based HCI-aware monitor adaptation framework to support identification, modification, creation, and removal of monitor rules based on user's interaction with a service-based system and different types of user context. A prototype tool has been implemented to demonstrate the framework.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127651760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"From textual use cases to service component models","authors":"Zuohua Ding, Mingyue Jiang, J. Palsberg","doi":"10.1145/1985394.1985396","DOIUrl":"https://doi.org/10.1145/1985394.1985396","url":null,"abstract":"There is a gap between system requirements described with natural language and system design models described with formal language. In this paper, we present a framework for automatically mapping textual use cases to service component models from a model-based point of view. The generated models capture service component signatures and language independent dynamic behaviors. We have implemented our framework and demonstrated the benefits via a case study.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123441027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Architecture-based reliability analysis of web services in multilayer environment","authors":"M. Rahmani, A. Azadmanesh, Harvey P. Siy","doi":"10.1145/1985394.1985403","DOIUrl":"https://doi.org/10.1145/1985394.1985403","url":null,"abstract":"The reliability analysis of web services is often focused on the web service components, ignoring the impact of the middleware located beneath the web services. A service-based software system is a multilayered system that includes the web service (WS), shared resources, and the hosting application server (AS). It is conjectured that the reliability prediction of the web services is improved if the reliability model accounts for such underlying layers. The initial experiment illustrates that the AS and shared resources can impact the overall reliability of web services greatly. This observation is demonstrated by simulating the interaction between a web service and the AS.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"1026 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113988296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Bucchiarone, R. Kazhamiakin, C. Cappiello, E. D. Nitto, V. Mazza
{"title":"A context-driven adaptation process for service-based applications","authors":"A. Bucchiarone, R. Kazhamiakin, C. Cappiello, E. D. Nitto, V. Mazza","doi":"10.1145/1808885.1808896","DOIUrl":"https://doi.org/10.1145/1808885.1808896","url":null,"abstract":"When building service-oriented systems the evolution of requirements and context is the norm rather than the exception. Therefore, it is important to make sure that the system is able to evolve as well without necessarily starting a completely new development process, and possibly on the fly. In this paper we specifically focus on the role of the context in the adaptation activities. For us context has various different facets as it includes information ranging from the situation in which users exploit a service-based application to the conditions under which the component services can be exploited. We elaborate on how and when the context should be defined, exploited, and evolved, and on the impact it has on the various activities related to adaptation of service-based applications. We use a case study to exemplify our first findings on this subject.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123010058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluation of online testing for services: a case study","authors":"Michaela Greiler, H. Groß, A. Deursen","doi":"10.1145/1808885.1808893","DOIUrl":"https://doi.org/10.1145/1808885.1808893","url":null,"abstract":"Service-oriented architectures (SOAs) have found their ways into industry to enable better business-to-business cooperation. With the advent of SOA, new challenges for software development and testing also appeared. In this article, we motivate the need for SOA online testing and show how it can reveal faults that slipped offline testing. The paper outlines a case study in which online testing has been implemented as proof-of-concept, but also evaluated in terms of its effectiveness to identify typical SOA runtime reconfiguration problems according to an existing fault taxonomy. The experiments of the case study demonstrate that online testing (1) can detect many typical runtime reconfiguration faults, and that (2) online testing provides additional value over offline testing.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124122552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Towards multi-design of situated service-oriented systems","authors":"J. Sousa, Zeynep Zengin, S. Malek","doi":"10.1145/1808885.1808897","DOIUrl":"https://doi.org/10.1145/1808885.1808897","url":null,"abstract":"This paper discusses ongoing changes to the boundaries and roles of design and run time in the software lifecycle. Specifically, it focuses on changes caused by the emergence of situated systems in open pervasive computing environments. Clearly, such changes have a direct repercussion on the roles and tasks of system developers, stakeholders, and users.\u0000 The paper proposes extensions to current software design notations, concerning (a) service discovery and ways to scope it to user-defined physical locations, and (b) the ability to incorporate and shed features and behaviors at run time, depending on which users are present and on their goals, and including the ability to resolve conflicts between such goals. Five small but illustrative example systems demonstrate the benefits of these extensions.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115555760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"An empirical comparison of methods to support QoS-aware service selection","authors":"B. Cavallo, M. D. Penta, G. Canfora","doi":"10.1145/1808885.1808899","DOIUrl":"https://doi.org/10.1145/1808885.1808899","url":null,"abstract":"Run-time binding is an important and useful feature of Service Oriented Architectures (SOA), which aims at selecting, among functionally equivalent services, the ones that optimize some QoS objective of the overall application. To this aim, it is particularly relevant to forecast the QoS a service will likely exhibit in future invocations.\u0000 This paper presents an empirical study aimed at comparing different approaches for QoS forecasting, namely the use of average and current values, linear models, and models based on time series. The study is performed on QoS data obtained by monitoring the execution of 10 real services for 4 months.\u0000 Results show that, overall, the use of time series forecasting has the best compromise in ensuring a good prediction error, being sensible to outliers, and being able to predict likely violations of QoS constraints.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127646552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Treiber, Lukasz Juszczyk, D. Schall, S. Dustdar
{"title":"Programming evolvable web services","authors":"M. Treiber, Lukasz Juszczyk, D. Schall, S. Dustdar","doi":"10.1145/1808885.1808895","DOIUrl":"https://doi.org/10.1145/1808885.1808895","url":null,"abstract":"Web services have emerged as a technology for designing and composing distributed applications. Recent research increasingly addressed the need to adapt such systems based on changing requirements and environmental constraints. From the developers point of view, it is already a daunting task to update the description, implementation, or configuration of individual services that are already deployed in the runtime environment. A major undertaking is update and maintenance of large scale service environments.\u0000 In this work, we introduce a programming model enabling the adaptation and evolution of service-oriented systems in a simple and intuitive way. Most existing work focuses on self-adaptation aspects. We present a user-centric approach and a framework supporting both automatic mechanisms for adaptation and foremost a programming model to reduce the burden of reconfiguration, update, and customization of service-based applications. We implemented the programming model on top of Genesis, a Java-based Web services framework.","PeriodicalId":380234,"journal":{"name":"Principles of Engineering Service-Oriented Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125734219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}