J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....model of the transmitted notifications. In nearly all cases subscriptions act as filters on the notifications and three filtering schemes can be distinguished. Subject and type based addressing schemes use path expressions and type hierarchies to denote and select otherwise opaque notifications [22,1,7]. The most flexible scheme, however, is o#ered by content based filtering that utilizes predicates on the entire content of a notification [18] Together with the typically used name value pairs data model, subscriptions look like: service = parking ) location = 100 Rebeca Drive ) cost 3 ....

J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

....at the UniversityofCambridge are doing work which is somewhat related to that presented here. Their approach is to use the active badge system to maintain a VRML2 representation of the labs. This enables users to interact with the environment using a graphical rather than a text based interface [2]. It should also be noted that this is work in progress and most of our effort so far has been to implement an application that can map real to virtual sighting events. Therefore, the discussion of real to virtual event mapping is more thorough than that of virtual to real mapping. 4.1 Example ....

John Bates, Jean Bacon, Ken Moody, and Mark Spiteri. Using Events for the Scalable Federation of Heterogeneous Components. In Proceedings of the Eighth ACM SIGOPS European Workshop, September 1998.

....person controlling the robot will know that this functionality is now available, or else the controller program must be updated and recompiled for usage as well. Michelle Munson, Todd Hodes, Thomas Fischer, Keung Hae Lee, Tobin Lehman, Ben Zhao. 16] J. Bates, J. Bacon, K. Moody, and M. Spiteri [6] D. Gelernter. 11] 3. Overview And Rationale of Goals Now that the foundation for our work has been explained, this chapter lays out the objectives for ideal supervisory robotic control. The goals are meant to describe an architecture that makes the most of the strengths of current systems and ....

Bates, J.; Bacon, J; Moody, K; Spiteri, M. "Using Events for the Scalable Federation of Heterogeneous Components." (September 1998).

....on which to build a mobile distributed systems platform. 4.5.2 Event Based Platforms Recent research has investigated the development of distributed systems that are based on the monitoring of, and response to, events. This includes work on the Cambridge University event based platform [Bates,98] Spiteri,98] EVE [Geppert,98] and the Generalised Event Monitoring (GEM) language [Mansouri Samani,97] Typically, these architectures have the ability to capture events, store them in event repositories and either forward events to interested applications or use them to engage actions ....

....extended form of the rd operation which yields each particular tuple only once. This approach is similar to the not i y operation included in the JavaSpaces platform [Sun,98a] Sun,98b] and mimics the approach taken by researchers at Cambridge University in their event based programming paradigm [Bates,98] Support for Transactions As section 4.5.3 noted, the tuple space paradigm does not offer inherent support for transactions which are groups of two or more related events that either succeed or fail as a unit. While it is possible to use a combination of directed communications and other ....

J. Bates, J. Bacon, K. Moody and M. Spiteri, "Using Events for the Scalable Federation of Heterogeneous Components", Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, 7th-10th September 1998, pp 58-65.

....fault tolerance, event persistence, reliability and security will be offered in a future version of the DREAM framework. The event handling abstraction outlined here is compatible with most general purpose event handling systems including Corba Events [CDK01] Elvin [ASBB 99, FMK 99] and Herald [BBMS98, Spi00]. QoSDREAM uses events primarily for delivery of contextual information to applications. The messaging service allows application objects to send and receive events and is also used by the Location Service to deliver events generated by EventAdaptors. The Messaging Service facilitates the ....

J. Bates, J. Bacon, K. Moody and M.D. Spiteri, "Using Events for the Scalable Federation of Heterogeneous Components", Proc. ACM SIGOPS EW'98, Sintra, Portugal, Sep 1998

....fault tolerance, event persistence, reliability and security will be offered in a future version of the DREAM framework. The event handling abstraction outlined here is compatible with most general purpose event handling systems including Corba Events [CDK01] Elvin [ASBB 99, FMK 99] and Herald [BBMS98, Spi00]. QoSDREAM uses events primarily for delivery of contextual information to applications. The messaging service allows application objects to send and receive events and is also used by the Location Service to deliver events generated by EventAdaptors. The Messaging Service facilitates the ....

J. Bates, J. Bacon, K. Moody and M.D. Spiteri, "Using Events for the Scalable Federation of Heterogeneous Components", Proc. ACM SIGOPS EW'98, Sintra, Portugal, Sep 1998

.... implemented an active management solution for multi service networks based on role driven policies [7,8] and Application Layer Active Networking (ALAN) 9] The management system supports a conventional management agent interface that can respond to high level instructions from system operators [10,11]. This interface is also open to use by users (who can use it to run programs active services by adding a policy pointing to the location of their program and providing an invocation trigger) Typically the management policies for the user programs are included in an XML metafile associated with ....

....a table of policies for each registered subject and the local agent will store the component policies in the appropriate parts of the database. Our approach avoids many information handling problems by using a lightweight scalable mechanism for policy transfer. The Information Management System [10] consists of a hierarchy of store and forward policy stores, with policies being classified by their propagation characteristics and storage duration. Two types of these information stores are used, their selection depending on the complexity of querying required against storage availability. ....

Bates J., Bacon J., Moody K., and. Spiteri M., "Using Events for the Scalable Federation of Heterogeneous Components", Proceedings of 8th ACM SIGOPS European Workshop, Sintra, Portugal. September 1998.

....policies for each registered subject and the management agent will store the component policies in the appropriate parts of the database. Our approach avoids many information handling problems by using a lightweight scalable mechanism for notification transfer. The Information Management System [7] consists of a hierarchy of store and forward notification stores, with notifications being classified by their propagation characteristics and storage duration. Two types of these information stores are used, their selection depending on the complexity of querying required against storage ....

Bates J., Bacon J., Moody K., and. Spiteri M., "Using Events for the Scalable Federation of Heterogeneous Components", Proceedings of 8th ACM SIGOPS European Workshop, Sintra, Portugal. September 1998.

....automation [3] Our research group has been researching Home Area Networks for the last 5 years [4] This paper is based on our experience with the communication primitives for such a system. Although, it is quite well understood in our group that RPC is not a suitable paradigm for such systems [5, 23, 31, 32], we feel that a large portion of the community in both research and industry is still using RPC (or its newer implementation like ROI, RMI) even when it is harmful. For example, UpnP, Easyliving and others have recently devised SOAP [6] based on RPC semantics, for home automation. Likewise, even ....

....used to accommodate continuous streams. The clients only need to know about one interface REGISTER, and the servers only need to know about the NOTIFY interface. Most of the type checking is done dynamically. This lends itself naturally as a unifying paradigm for federating heterogeneous systems [31] like ubiquitous systems. Unfortunately the traditional event architectures are not rich enough [30,29] to support all of the above requirements. What we need is an event architecture that supports the following features. Generic interfaces for event registration, generation and or ....

. Bates, J. Bacon, K. Moody and M. Spiteri, "Using Events for the Scalable Federation of Heterogeneous Components". Proceedings of ACM SIGOPS European Workshop, September 1998.

....of policies for each registered subject and the local agent will store the component policies in the appropriate parts of the database. Our approach avoids many information handling problems by using a lightweight scalable mechanism for information transfer. The Information Management System [8] consists of a hierarchy of store and forward information stores, with events being classified by their propagation characteristics and storage duration. Two types of these information stores are used, their selection depending on the complexity of querying required against storage availability. ....

Bates J., Bacon J., Moody K., and. Spiteri M., "Using Events for the Scalable Federation of Heterogeneous Components", Proceedings of 8th ACM SIGOPS European Workshop, Sintra, Portugal. September 1998.

....illustrate the problems that arise due to inaccuracy and message transmission delays. I. Introduction Event based computing is an emerging paradigm for composing applications in open, heterogeneous distributed environments [4,23,20,13] Applications like workflow management [7,19,14] CSCW [5] and monitoring applications ranging from Air Traffic Control [3,29] to Health Care Systems [12] may be constructed by leveraging event services for detection and distribution of events in a publish subscribe manner. The use of generic event services requires that the semantics of event ....

....to the detection of spurious events. The Cambridge Event Architecture (CEA) 2] presents the publish register notify paradigm. Mediators provide the means to compose events. CEA is oriented to support multimedia, mobility, group interaction and composition of heterogeneous software components [5]. The implementation of CEA is based on a proprietary RPC system, limiting interoperability. Recently, COBEA [31] was proposed, which extends the CORBA Event Service [37] with the CEA publish register notify paradigm, supporting fault tolerance, composite events, server side filtering and access ....

J. Bates and J. Bacon and K. Moody and M. Spiteri. Using Events for the Scalable Federation of Heterogeneous Components. In Proceedings of the SIGOPS European Workshop on Support for Composing Distributed Applications, September 1998.

....constructs similar to READY s compound matching operators. In terms of functionality, one of the main differences between this project and READY is our study of higher level constructs such as the session and grouping constructs. Recently, this group began exploring federation of event services [2]. TAO [6] is an object oriented, real time event service that extends the CORBA Event Service to suit real time systems and support periodic, rate based event processing, and efficient filtering and correlation. Similar to READY, TAO suppliers specify the types of events they generate, and ....

J. Bates, Bacon J, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In 8th ACM SIGOPS European Workshopon Support for Composing Distributed Applications, Sintra, Portugal, September 1998.

....and efficient programming method for active systems, where 1 Binary data can be used in standard XML documentsby encoding it, i.e. in Base64 as described in the XML Data proposal [13] We use the same approach. components must frequently respond to state changes in other components [2, 3]. Control networks are populated by hundreds of event sources and receivers (sensors, actuators, and are thus well matched to the domain. Most event systems work via a publish register notify model ala the CORBA model [18] a receiving component which has registered an interest in the event ....

J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using Events for the Scalable Federation of Heterogeneous Components . Proceedings of the ACM SIGOPS European Workshop, September 1998.

....constructs similar to READY s compound matching operators. In terms of functionality, one of the main differences between this project and READY is our study of higher level constructs such as the session and grouping constructs. Recently, this group began exploring federation of event services [2]. TAO [11] is an object oriented, real time event service. One of the main contributions of TAO is the extension of the CORBA event service to suit real time systems and support periodic, ratebased event processing and efficient event filtering and correlation. TAO provides source based and ....

J. Bates, Bacon J, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In 8th ACM SIGOPS European Workshop on Support for Composing Distributed Applications, Sintra, Portugal, September 1998.

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J. Bates, J. Bacon, K. Moody and M.D. Spiteri, "Using Events for the Scalable Federation of Heterogeneous Components ", Proc. ACM SIGOPS EW'98, Sintra, Portugal, Sep 1998

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, pages 58--65, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri, "Using Events for the Scalable Federation of Heterogeneous Components," in Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications. Sintra, Portugal, 1998, pp. 58-65.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, pages 58--65, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In Eighth ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, September 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, pages 58--65, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates, J. Bacon, K. Moody, and M. Spiteri. Using events for the scalable federation of heterogeneous components. In P. Guedes and J. Bacon, editors, Proceedings of the 8th ACM SIGOPS European Workshop: Support for Composing Distributed Applications, Sintra, Portugal, Sept. 1998.

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J. Bates et al., "Using Events for the Scalable Federation of Heterogeneous Components," Proc. ACM SIGOPS European Workshop, Sept. 1998.

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