Disconnected operation in the Thor object-oriented database system

Gruber, R.; Kaashoek, F.; Liskov, B.; Shrira, L.

doi:10.1109/mcsa.1994.512734

Cited by 9 publications

(10 citation statements)

References 15 publications

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“…The Thor object-oriented database is a persistent object system that supported disconnected operation in an optimistic fashion [11,21,22]. It was designed for desktop applications operating in a WAN environment where server redundancy was key.…”

Section: Distributed and Persistent Object Systemsmentioning

confidence: 99%

Automated object persistence for JavaScript

Cannon

Wohlstadter

2010

Proceedings of the 19th International Conference on World Wide Web

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Traditionally web applications have required an internet connection in order to work with data. Browsers have lacked any mechanisms to allow web applications to operate offline with a set of data to provide constant access to applications. Recently, through browser plug-ins such as Google Gears, browsers have gained the ability to persist data for offline use. However, until now it's been difficult for a web developer using these plug-ins to manage persisting data both locally for offline use and in the internet cloud due to: synchronization requirements, managing throughput and latency to the cloud, and making it work within the confines of a standards-compliant web browser. Historically in nonbrowser environments, programming language environments have offered automated object persistence to shield the developer from these complexities. In our research we have created a framework which introduces automated persistence of data objects for JavaScript utilizing the internet. Unlike traditional object persistence solutions, ours relies only on existing or forthcoming internet standards and does not rely upon specific runtime mechanisms such as OS or interpreter/compiler support. A new design was required in order to be suitable to the internet's unique characteristics of varying connection quality and a browser's specific restrictions. We validate our approach using benchmarks which show that our framework can handle thousands of data objects automatically, reducing the amount of work needed by developers to support offline Web applications.

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Section: Distributed and Persistent Object Systemsmentioning

confidence: 99%

Automated object persistence for JavaScript

Cannon

Wohlstadter

2010

Proceedings of the 19th International Conference on World Wide Web

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“…The full replication approach [24] has a high overall cost in terms of duplicated space. Thor [10,13] provides a distributed object-oriented database system where an Object Query Language could provide object navigation and allow for hoarding queries to be executed by the application. Phatak [25] considered hoard attributes to be attributes that capture access patterns for some set of objects.…”

Section: Previous Work On Prefetchingmentioning

confidence: 99%

SPREE: Object Prefetching for Mobile Computers

Kvilekval

Singh

2004

On the Move to Meaningful Internet Systems 2004: CoopIS, DOA, and ODBASE

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Abstract. Mobile platforms combined with large databases promise new opportunities for mobile applications. However, mobile computing devices may experience frequent communication loss while in the field. In order to support database applications, mobile platforms are required to cache portions of the available data which can speed access over slow communication channels and mitigate communication disruptions. We present a new prefetching technique for databases in mobile environments based on program analysis. SPREE generates maps of a client program's use of structured data to be used by our prefetching runtime system. We apply SPREE in the context of mobile programming for object structured databases demonstrating an effective way to prefetch/hoard over unreliable networks with speedups up to 80% over other techniques.

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“…An extension for disconnected operation in Thor has been proposed by Gruber and others [30], but it has not been implemented.…”

Section: Relocatable Dynamic Objectsmentioning

confidence: 99%

Mobile computing with the Rover toolkit

Joseph¹,

Tauber

Kaashoek

1997

IEEE Trans. Comput.

165

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Rover is one of the first architectures that supports the construction of both mobileadaptive applications and mobile-adaptive proxies for mobile-transparent applications. To excel in the harsh conditions of a mobile environment, mobile-adaptive applications are aware of and take an active part in adapting to those conditions. The mobile-transparent approach is appealing because it allows applications to be run without alteration. The contributions of this thesis include the Rover architecture and a reference implementation, the Rover Toolkit. Together, the architecture and toolkit support a set of programming and communication abstractions that enable and simplify the construction of both mobile-adaptive proxies for mobile-transparent applications and new mobile-adaptive applications. The programming abstractions include Relocatable Dynamic Objects, a form of code-and data-shipping, along with remote invocation and method logging, that allows mobile-adaptive applications to dynamically adapt to environmental changes, and programming language extensions for reliable execution of applications at servers. The communication abstractions are based upon Queued Remote Procedure Call, a form of remote invocation that provides asynchronous, reliable delivery of requests and results. Using the Rover abstractions, applications obtain increased availability, concurrency, resource allocation efficiency, code reuse, fault tolerance, data consistency, application adaptation to environmental changes, and more efficient scheduling and utilization of communication channels. Experimental evaluation of a suite of mobile applications built with the toolkit demonstrates that such application-level control can be obtained with relatively little programming overhead and allows correct operation, increases interactive performance, and reduces network utilization under intermittently connected conditions. John Guttag also deserves thanks for mentoring me over the years. I thank him for the guidance he has given me, especially when I was changing research groups and during my search for a job.I thank David Gifford for his efforts during the design stages of the Rover toolkit, in particular his ideas for the semantics of QRPC.I thank my parents for the motivation they instilled in me, for all the support they have provided, and for their faith in me.I owe a lot of thanks to the rest of the Rover project team: Joshua Tauber, George Candea, Constantine Cristakos, Alan F. deLespinasse, and Michael Shurpik. Special thanks go to Josh for all the great design arguments/discussions we shared that helped shape the Rover architecture and for his help in building and debugging applications.I thank the Parallel and Distributed Operating Systems group for reading many drafts of the papers behind this thesis (thanks Massimiliano Poletto, Eddie Kohler, and Greg Ganger) and for providing me with a fun, exciting, and sometimes loud (thanks David Mazieres and Emmett Witchel), research environment. Thanks also to Neena Lyall for making the administ...

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Disconnected operation in the Thor object-oriented database system

Cited by 9 publications

References 15 publications

Automated object persistence for JavaScript

Automated object persistence for JavaScript

SPREE: Object Prefetching for Mobile Computers

Mobile computing with the Rover toolkit

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