T. Springer, Daniel Schuster, I. Braun, Jordan Janeiro, M. Endler, A. Loureiro
While a multitude of collaborative applications are available in mobile environments, most of them are built from scratch or use proprietary libraries. In this paper we present a conceptual architecture and a set of reusable services for mobile collaborative systems. The evaluation is based on the implementation of a mobile collaborative tourist guide system using three different mobile platforms.
{"title":"A flexible architecture for mobile collaboration services","authors":"T. Springer, Daniel Schuster, I. Braun, Jordan Janeiro, M. Endler, A. Loureiro","doi":"10.1145/1462735.1462770","DOIUrl":"https://doi.org/10.1145/1462735.1462770","url":null,"abstract":"While a multitude of collaborative applications are available in mobile environments, most of them are built from scratch or use proprietary libraries. In this paper we present a conceptual architecture and a set of reusable services for mobile collaborative systems. The evaluation is based on the implementation of a mobile collaborative tourist guide system using three different mobile platforms.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115772611","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}
Social networking and social networking sites have gained popularity among internet users during the past few years. Social networks fulfill the need of users to stay connected to friends and other people interested in the same issues. Combining social networks to the mobile environment is a growing interest of mobile device users as it allows the users to be in their online social community despite their mobility. This paper introduces one social networking approach on the mobile environment. The approach is based on dynamic group creation and management in the PeerHood environment. A reference implementation of a social networking application built on top of PeerHood is presented.
{"title":"Social networking on mobile environment","authors":"B. Karki, Arto Hämäläinen, J. Porras","doi":"10.1145/1462735.1462760","DOIUrl":"https://doi.org/10.1145/1462735.1462760","url":null,"abstract":"Social networking and social networking sites have gained popularity among internet users during the past few years. Social networks fulfill the need of users to stay connected to friends and other people interested in the same issues. Combining social networks to the mobile environment is a growing interest of mobile device users as it allows the users to be in their online social community despite their mobility. This paper introduces one social networking approach on the mobile environment. The approach is based on dynamic group creation and management in the PeerHood environment. A reference implementation of a social networking application built on top of PeerHood is presented.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123466185","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}
The OSGi platform embodies the desirable concepts of modularity and dynamic components to build a Service Oriented Platform, whose components interact by means of well defined contracts. Despite being service oriented, it lacks mechanisms to differentiate service's customers from each other and, therefore, it fails to provide different Service Level Agreements. In this paper we start by isolating customers from each other and at a later stage provide mechanisms to offer adequate SLAs. As each client is isolated in a self-contained environment we are able to decouple them from the platform (and from the underlying node) to offer mobility among nodes. The advantages of this approach are two-fold: 1) ability to cope with node failures by migrating customers to healthy nodes and 2) optimization of global resource resource usage and further enforcement of SLA by migrating customers to nodes with adequate resources available.
{"title":"Dependable distributed OSGi environment","authors":"M. Matos, A. Sousa","doi":"10.1145/1462735.1462765","DOIUrl":"https://doi.org/10.1145/1462735.1462765","url":null,"abstract":"The OSGi platform embodies the desirable concepts of modularity and dynamic components to build a Service Oriented Platform, whose components interact by means of well defined contracts.\u0000 Despite being service oriented, it lacks mechanisms to differentiate service's customers from each other and, therefore, it fails to provide different Service Level Agreements. In this paper we start by isolating customers from each other and at a later stage provide mechanisms to offer adequate SLAs.\u0000 As each client is isolated in a self-contained environment we are able to decouple them from the platform (and from the underlying node) to offer mobility among nodes. The advantages of this approach are two-fold: 1) ability to cope with node failures by migrating customers to healthy nodes and 2) optimization of global resource resource usage and further enforcement of SLA by migrating customers to nodes with adequate resources available.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128497275","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}
Steady increases in the adoption of web services for automating critical business processes or activities demand that certain Quality of Service (QoS) metrics are met. Common approaches to QoS monitoring are primarily based on a centralized model that we found to be inadequate in large-scale and high-volume computing environments, such as Intel's Assembly and Test manufacturing facilities. The main reasons are: scalability, issues related to practical deployment, and reconfigurability. In this paper, we will present a peer-to-peer approach that works by transparently turning a web service into a potential QoS monitor for all activities that flow through it. A lightweight middleware component, residing within the web service implementation, provides this transparency. The middleware component collects QoS metrics from a web service during activity processing and embeds the metrics within the business data payload. This allows the peers of that service to receive QoS metrics, apply specific monitoring rules, or take specific actions as the activity flows from one web service to the next. This decentralized pattern allows activities of different complexity and length to be monitored seamlessly. We will discuss our experience in implementing and using this technique at Intel's high-volume Assembly and Test manufacturing environment that span across multiple continents and geographic regions.
{"title":"A peer-to-peer approach to providing QoS monitoring for web service activities","authors":"F. Karim","doi":"10.1145/1462735.1462738","DOIUrl":"https://doi.org/10.1145/1462735.1462738","url":null,"abstract":"Steady increases in the adoption of web services for automating critical business processes or activities demand that certain Quality of Service (QoS) metrics are met. Common approaches to QoS monitoring are primarily based on a centralized model that we found to be inadequate in large-scale and high-volume computing environments, such as Intel's Assembly and Test manufacturing facilities. The main reasons are: scalability, issues related to practical deployment, and reconfigurability.\u0000 In this paper, we will present a peer-to-peer approach that works by transparently turning a web service into a potential QoS monitor for all activities that flow through it. A lightweight middleware component, residing within the web service implementation, provides this transparency. The middleware component collects QoS metrics from a web service during activity processing and embeds the metrics within the business data payload. This allows the peers of that service to receive QoS metrics, apply specific monitoring rules, or take specific actions as the activity flows from one web service to the next. This decentralized pattern allows activities of different complexity and length to be monitored seamlessly. We will discuss our experience in implementing and using this technique at Intel's high-volume Assembly and Test manufacturing environment that span across multiple continents and geographic regions.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128689704","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}
We present a programming model and distributed protocol to reprogram application-defined subsets of nodes in a wireless sensor network (WSN). the protocol operation is rooted in the use of social information inferred from the behavior of the individuals nodes are attached to.
{"title":"Selective code dissemination in mobile wireless sensor networks","authors":"B. Pásztor, L. Mottola, C. Mascolo, G. Picco","doi":"10.1145/1462735.1462768","DOIUrl":"https://doi.org/10.1145/1462735.1462768","url":null,"abstract":"We present a programming model and distributed protocol to reprogram application-defined subsets of nodes in a wireless sensor network (WSN). the protocol operation is rooted in the use of social information inferred from the behavior of the individuals nodes are attached to.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128580972","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. Bessani, Hans P. Reiser, Paulo Sousa, Ilir Gashi, Vladimir Stankovic, T. Distler, R. Kapitza, Alessandro Daidone, R. Obelheiro
The goal of the FOREVER project is to develop a service for Fault/intrusiOn REmoVal through Evolution & Recovery. In order to achieve this goal, our work addresses three main tasks: the definition of the FOREVER service architecture; the analysis of how diversity techniques can improve resilience; and the evaluation of the FOREVER service. The FOREVER service is an important contribution to intrustion-tolerant replication middleware and significantly enhances the resilience.
{"title":"FOREVER: Fault/intrusiOn REmoVal through Evolution & Recovery","authors":"A. Bessani, Hans P. Reiser, Paulo Sousa, Ilir Gashi, Vladimir Stankovic, T. Distler, R. Kapitza, Alessandro Daidone, R. Obelheiro","doi":"10.1145/1462735.1462763","DOIUrl":"https://doi.org/10.1145/1462735.1462763","url":null,"abstract":"The goal of the FOREVER project is to develop a service for Fault/intrusiOn REmoVal through Evolution & Recovery. In order to achieve this goal, our work addresses three main tasks: the definition of the FOREVER service architecture; the analysis of how diversity techniques can improve resilience; and the evaluation of the FOREVER service. The FOREVER service is an important contribution to intrustion-tolerant replication middleware and significantly enhances the resilience.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115541625","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}
The OSGi Service Platform is becoming the de facto middleware for the deployment of dynamic modular Java-based applications. It gives the possibility to install, to activate, to update and to uninstall application modules without needing to restart the host Java Virtual Machine. However, modules run on the memory space, and it is not possible to ensure that objects from unavailable (e.g. uninstalled) modules will no longer be referenced, since it depends on developers to correctly provide code that will handle the corresponding OSGi events which inform the departure of a module. Such errors, resulted from the mishandling of the dynamic arrival and departure of modules, are a hard to detect problem described in the OSGi specification as Stale References. It may lead to inconsistencies in application's behavior, state and memory. So far there were no tools addressing the diagnostics of this issue. In this demo we present the live utilization of our experimental tool, Service Coroner, which helps OSGi application developers and administrators in the diagnosis of stale references. Our presentation focus on the diagnosis of actual OSGi based applications that present the occurrence of stale references upon dynamic updates of modules.
{"title":"Using the service coroner tool for diagnosing stale references in the OSGi platform","authors":"Kiev Gama, D. Donsez","doi":"10.1145/1462735.1462749","DOIUrl":"https://doi.org/10.1145/1462735.1462749","url":null,"abstract":"The OSGi Service Platform is becoming the de facto middleware for the deployment of dynamic modular Java-based applications. It gives the possibility to install, to activate, to update and to uninstall application modules without needing to restart the host Java Virtual Machine. However, modules run on the memory space, and it is not possible to ensure that objects from unavailable (e.g. uninstalled) modules will no longer be referenced, since it depends on developers to correctly provide code that will handle the corresponding OSGi events which inform the departure of a module. Such errors, resulted from the mishandling of the dynamic arrival and departure of modules, are a hard to detect problem described in the OSGi specification as Stale References. It may lead to inconsistencies in application's behavior, state and memory. So far there were no tools addressing the diagnostics of this issue. In this demo we present the live utilization of our experimental tool, Service Coroner, which helps OSGi application developers and administrators in the diagnosis of stale references. Our presentation focus on the diagnosis of actual OSGi based applications that present the occurrence of stale references upon dynamic updates of modules.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114904045","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}
J. Mocito, J. A. Briones-García, B. Koldehofe, Hugo M. Miranda, L. Rodrigues
Establishing content-based publish/subscribe in the resource constrained and failure prone environment of Mobile Ad-Hoc Networks (MANETs) is a highly challenging task. Movement of nodes and network partitioning can require frequent and possibly expensive reorganizations of the publish/subscribe system. Many approaches towards publish/subscribe in MANETs either rely explicitly on location information, or are characterized by a high subscription and publication overhead. In this paper we present preliminary research on how geographical distribution of subscriptions may help to overcome some shortcomings of both approaches.
{"title":"Geographical distribution of subscriptions for content-based publish/subscribe in MANETs","authors":"J. Mocito, J. A. Briones-García, B. Koldehofe, Hugo M. Miranda, L. Rodrigues","doi":"10.1145/1462735.1462764","DOIUrl":"https://doi.org/10.1145/1462735.1462764","url":null,"abstract":"Establishing content-based publish/subscribe in the resource constrained and failure prone environment of Mobile Ad-Hoc Networks (MANETs) is a highly challenging task. Movement of nodes and network partitioning can require frequent and possibly expensive reorganizations of the publish/subscribe system. Many approaches towards publish/subscribe in MANETs either rely explicitly on location information, or are characterized by a high subscription and publication overhead. In this paper we present preliminary research on how geographical distribution of subscriptions may help to overcome some shortcomings of both approaches.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125299957","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}
Jong Hoon Ahnn, K. Birman, Krzysztof Ostrowski, R. V. Renesse
Web services and platforms such as .NET make it easy to integrate interactive end-user applications with backend services. However, it remains hard to build collaborative applications in which information is shared within teams. We present a new drag-and-drop technology, in which standard office documents (spreadsheets, databases, etc.) are interconnected with eventdriven middleware ("live distributed objects"), to create distributed applications in which changes to underlying data propagate quickly to downstream applications. Information is replicated in a consistent manner, making it easy for team members to share updates and to coordinate their actions. In this demo, we present our middleware platform in office automation settings which is highly automated and highly configurable.
{"title":"Using live distributed objects for office automation: demo proposal","authors":"Jong Hoon Ahnn, K. Birman, Krzysztof Ostrowski, R. V. Renesse","doi":"10.1145/1462735.1462752","DOIUrl":"https://doi.org/10.1145/1462735.1462752","url":null,"abstract":"Web services and platforms such as .NET make it easy to integrate interactive end-user applications with backend services. However, it remains hard to build collaborative applications in which information is shared within teams. We present a new drag-and-drop technology, in which standard office documents (spreadsheets, databases, etc.) are interconnected with eventdriven middleware (\"live distributed objects\"), to create distributed applications in which changes to underlying data propagate quickly to downstream applications. Information is replicated in a consistent manner, making it easy for team members to share updates and to coordinate their actions. In this demo, we present our middleware platform in office automation settings which is highly automated and highly configurable.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132612904","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}
D. Hughes, N. Bencomo, G. Blair, G. Coulson, P. Grace, Barry Porter
This demonstration showcases the Gridkit middleware in a flood monitoring and warning scenario. Gridkit provides the services required to support wireless sensor network based environmental monitoring and also hosts lightweight hydraulic models which are used to provide timely alerts to local residents warning of imminent flood events. In this scenario, Gridkit abstracts over a number of low-level sensing, computational and networking technologies. This paper and associated demonstration will show that using distributed dynamic reconfiguration, these heterogeneous sensor network technologies may be safely adapted to cope with changing environmental conditions while providing timely flood warnings, resulting in significant power savings and performance improvements.
{"title":"Exploiting extreme heterogeneity in a flood warning scenario using the Gridkit middleware","authors":"D. Hughes, N. Bencomo, G. Blair, G. Coulson, P. Grace, Barry Porter","doi":"10.1145/1462735.1462748","DOIUrl":"https://doi.org/10.1145/1462735.1462748","url":null,"abstract":"This demonstration showcases the Gridkit middleware in a flood monitoring and warning scenario. Gridkit provides the services required to support wireless sensor network based environmental monitoring and also hosts lightweight hydraulic models which are used to provide timely alerts to local residents warning of imminent flood events. In this scenario, Gridkit abstracts over a number of low-level sensing, computational and networking technologies. This paper and associated demonstration will show that using distributed dynamic reconfiguration, these heterogeneous sensor network technologies may be safely adapted to cope with changing environmental conditions while providing timely flood warnings, resulting in significant power savings and performance improvements.","PeriodicalId":340887,"journal":{"name":"Companion '08","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124606656","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}
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