D. S. Rosenblum and A. L. Wolf, "A design framework for internet-scale event observation and notification," in Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE 97) (M. Jazayeri and H. Schauer, eds.), pp. 344--360, Springer--Verlag, 1997.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....significantly reduce the burden on network and processing infrastructure and yield a significant gain in efficiency. Significant research has been conducted in the fields of distributed event notification services as described by Hinze et al. HF99] Carzaniga et al. CRW98] and Rosenblum et al.[RW97], but few information retrieval systems have been implemented on top of such an infrastructure . In addition, our The MediAS system has been implemented in a digital library environment on top of infrastructure described by Hinze et al. HF99] notification scheme leaves the decision of ....

....profiles with information items (or vice versa) While we do not use a specific event notification system, implementing PIE or persistent querying on top of such a foundation would not be difficult. Significant work has been done in the field of distributed event notifications. Wolf and Rosenblum [RW97] present a model for internet scale event notifications. They evaluate previous work in event notification and describe the shortcomings of other systems. Then, they propose a framework consisting of seven models, the levels of which address different aspects of event observation and propagation. ....

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David S. Rosenblum and Alexander L. Wolf. A Design Framework for InternetScale Event Observation and Notification. In Mhedi Jazayeri and Helmut Schauer, editors, Proceedings of the 6th European Software Egnineering Conference, volume Software Engineering Notes of Lecture Notes in Computer Science, pages 344--360, Zurich, Switzerland, September 1997. ESCE / FSE, Springer-Verlag.

....event based Scalability session based web based push based Figure 2.1: Degree of coupling vs. degree of scalability Session based and web based models have been the subject to many studies. Event based systems on the Internet scale have also recently been subject of intensive analysis [144, 179]. Push systems, on the other hand, seem to have had a short time in the limelight and then fallen out of favor in the academic world. They are, however, heavily used in practical applications on the web. The purpose of this chapter is to establish the push based model as a viable model of ....

....is well developed for local area networks. In a large scale, heterogeneous setting like the Internet, however, new and adapted technologies are needed since many of the premises of a LAN do not hold at the Internet scale. A design framework for Internetscale event based systems is presented in [144] that suggests a seven dimensional design space: object model, event model, naming model, observation model, time model, observation model, and resource model. Some classifications of event based approaches are given in [26] Design issues of event based architectures are discussed in [16] The ....

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D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. Proceedings of the ESEC/FSE '97 -- 6th European Software Engineering Conference held jointly with the 5th ACM SIGSOFT Symposium on the Foundations of Software Engineering (Zurich, Switzerland, September 22--25,

....with very powerful constructs. They enable the specification of the appropriate actions that need to take place in response to a state change and allow their execution in a single atomic step. In particular, it is worth noting how this model is much more powerful than many event based ones [32], including those exploited by tuple space middleware such as TSpaces [12] and JavaSpaces [13] that are typically stateless and provide no guarantee about the atomicity of event reactions. Nevertheless, this expressive power comes at a price. In particular, when multiple hosts are present, the ....

D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc. of the European Software Engineering Conf. held jointly with the 5 ACM SIGSOFT Symp. on the Foundations of Software Engineering (ESEC/FSE97), number 1301 in LNCS, Zurich (Switzerland), September 1997. Springer.

....the figure, subscriptions are shown only for a single event pattern. To simplify the treatment, here and in the rest of the paper we ignore the presence of clients and focus on dispatchers. Accordingly, even if in principle only clients can be subscribers, For more detailed comparisons see [4, 7, 15]. Other optimizations are possible, e.g. by defining a notion of coverage among subscriptions, or by aggregating them, as in [4] Figure 1: Subscription forwarding. with some stretch of terminology we say that a dispatcher is a subscriber if at least one of its clients is a subscriber. ....

D. Rosenblum and A. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In

....the client is attached to. There, the event pattern is inserted in a subscription table, together with the identifier of the subscriber. Then, the subscription is propagated by the dispatcher, which now behaves as a subscriber with respect to the rest of the For more detailed comparisons see [4, 9, 25]. Unless otherwise stated, in the following we refer to a dispatching server simply as dispatcher, although the latter represents the whole distributed component in charge of dispatching events instead of a specific server. dispatching network, to all of its neighboring dispatchers on the ....

D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc. of European Software Engineering Conf. held jointly with the 5 Symp. on the Foundations of Software Engineering (ESEC/FSE97), LNCS 1301, Zurich (Switzerland), September 1997. Springer.

....can use it to store the text, and to have it retrieved by the controller during the adoption of L. We also provide an HTTP based law server as part of the Moses middleware. Law , our implementation of policy BT,presented below, utilizes so called publish subscribe (P S for short) service [9, 7]. In general, the P S service provides mediation between the producers (or publishers) of information, and its consumers (or subscribers) Such a server may run centralized on a single host, or distributed on multiple hosts; in either case, we call a host that runs such server software as a P S ....

D. Rosenblum and A. Wolf. A design framework for internet-scale event observation and notification. In Proc. of the Sixth European Software Engineering Conference; Zurich, Switzerland; LNCS 1301, pages 344--360. SpringerVerlag, Sept. 1997.

....according to the interconnection topology of dispatching servers, and the strategy exploited to route subscriptions and events. In this work we consider a subscription forwarding scheme on a tree topology, as this choice covers the majority of existing systems. For more detailed comparisons see [4, 5, 12]. Unless otherwise stated, in the following we will refer to dispatching servers simply as dispatchers, although the latter term refers more precisely to the whole distributed component in charge of dispatching events, rather than to a specific server that is part of it. In a subscription ....

D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc. of the 6 European Software Engineering Conf. held jointly with the 5 Symp. on the Foundations of Software Engineering (ESEC/FSE97), LNCS 1301, Zurich (Switzerland), September 1997. Springer.

....communicating directly; and only use adapters and wrappers to adapt as much as possible the communication. In the high end they consider process based approaches, but where the process controller directly drives the real tools. In our approach, the Corba (or RMI) layer [7] the event layer like [8] [11] the different technology around communication (XML and others) 7] and the different technology and patterns for interfacing tools (mediators, wrappers and other proxies[3] are simply technology means, they are not concepts. We strongly believe that a real solution can only emerge from a ....

D.S. Rosemblum and A. Wolf. A design Framework for Internet-Scale Event Observation and Notification. 6th ESEC. Zurich, Switzeland, September 1997.

....by the dispatcher, which now behaves as a subscriber with respect to the rest of the dispatching network, to all of its neighboring dispatchers on the overlay network. In turn, they record the subscription and re propagate it towards all their neighbor For more detailed comparisons see [3, 9, 24]. Unless otherwise stated, in the following we refer to a dispatching server simply as dispatcher, although the latter represents the whole distributed component in charge of dispatching events instead of a specific server. ing dispatchers, except for the one that sent it. This scheme is ....

D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification.

....the presence, of those they communicate with. Among several techniques that have been developed to support such communication which e#ectively decouples the producers of information from its consumers, both in time and in space [6] the most prominent are: the publish subscribe (P S, for short) [7, 15], and the Linda like tuple space [5, 13] middlewares. The publish subscribe paradigm, which we will take here as a representative of what enables decoupled communication, provides mediators between the producers of information (which we call here informers) and its consumers (the clients, or ....

D.S. Rosenblum and A.L. Wolf. A design framework for internet-scale event observation and notification. In Proc. of the Sixth European Software Engineering Conference; Zurich, Switzerland; LNCS 1301, pages 344--360. Springer-Verlag, September 1997.

....of a new development process [14] 16] the new focus on vendor customer relationships[15] the impact of not controlling the rate and content of changes, the impact of not owning the source code for critical applications [19] andsoon. Interoperability In our approach, Corba or RMI [5] events [6] [8] communication standards (XML and others) 5] as well as mediators, wrappers and other proxies[2] are simply technology means, they are not concepts. EAI The Enterprise Application Integration (EAI) domain, addresses the same issue [2] they have explicitly identified the same problems. ....

D.S. Rosemblum and A. Wolf. A design Framework for Internet-Scale Event Observation and Notification. 6th ESEC. Zurich, Switzeland, September 1997.

....Each dispatcher, in turn, records the event pattern and re forwards the subscription to its neighbors, except for the one that sent it. This scheme is usually optimized by avoiding subscription forwarding of the same event pattern in the same direction . For more detailed comparisons see [3, 5, 10]. Hereafter we refer to dispatching servers simply as dispatchers, although the latter refers more precisely to the whole distributed component in charge of dispatching events, rather than to a specific server part of it. Other optimizations are possible, e.g. by defining a notion of ....

D. Rosenblum and A. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc. of ESEC/FSE97, LNCS 1301. Springer, 1997.

....constituent parts illustrated in figure 2.2(a) The object is the source of all events, which must be observed in order to be processed. If they are not observed, then they are lost. The act of generating an event is free; it is the act of observing and delivering the event which incur a cost[35]. In figure 2.2(b) the observer is clearly the primary sink, although both the broker and the client are also event sinks. The broker is a component that may allow preprocessing of events before they are delivered to the client such as aggregation (union of events) filtering ....

David S. Rosenblum and Alexander L. Wolf. A Design Framework for InternetScale Event Observation and Notification. In Proceedings of the Sixth European Software Engineering Conference/ACM SIGSOFT Fifth Symposium on the Foundations of Software Engineering, pages 344--360, Zurich, Switzerland, September 1997.

....was more compatible with our targeted environment, since we can leverage the fact that each member has a view of the entire system to optimize performance. Because of all the added functionality, PlanetP resembles previous work done on tuple spaces [10, 25, 17] and publisher subscriber models [21, 9]. The former introduced the idea of space and time decoupling by allowing publishers to post tuples without knowing who the receiver is or when it will pick up the tuples. The latter added the concept of flow decoupling, which means that a node does not need to poll for updates; rather, it will be ....

D. S. Rosenblum and A. L. Wolf. A design framework for internet-scale event observation and notification. In M. Jazayeri and H. Schauer, editors, Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE 97), pages 344--360. Springer-- Verlag, 1997.

....Implementation details Two prototypes: the first implemented both in CORBA and in DCOM, the latter by using XML and EJB COM components CORBA objects Java components (EJB like) developed from scratch. CORBA wrappers for the Cooperative Gateway Publish Subscribe pattern [6][12][8] deployed by using Message Oriented Middleware (MOM) and XML DTDs documents Special purpose cooperative gateways and back end ERPbased accounting systems Access Keys Warehouse approach [1] a warehouse of database identifiers maintains the coherence among distributed ....

D.S. Rosenblum, A.L. Wolf: "A Design Framework for Internet-Scale Event Observation and Notification". Proceedings of the 6th European Software Engineering Conference (Joint with SIGSOFT '98, Foundations of Software Engineering), Zurich, Switzerland, 1997.

....lead to a match. We expect that P2P e commerce will be based on an infra structure that supports the publication of and subscription to event streams. While many such systems [6] do exist, they operate within small (LAN type) networks; however, e#orts are underway to scale them up to the internet [9]. Content based Routing As the number of these types of o#ering events grows, the nature of the o#erings also can get more complex: incorporating not just the description of the salable item, but also such aspects as risk management, delivery schedules, pricing policies etc. Managing the ....

David S. Rosenblum and Alexander L. Wolf. "A Design Framework for Internet-Scale Event Observation and Notification," Proceedings of the Sixth European Software Engineering Conference / ACM SIGSOFT Fifth Symposium on the Foundations of Software Engineering, 1997.

....EUs within the CE where the event is generated. In fact, event dispatching suffers of the same problem highlighted for message passing in presence of mobile EUs. Furthermore, building scalable and efficient mechanisms for dispatching events over large scale networks is still an open research area [93]. Nevertheless, the first proposals of architectures overcoming the problem are beginning to appear in [11, 124] Some of these proposals combine the notion of event with the notion of group. The relationship determining whether an EU belongs or not to a given group is not necessarily related with ....

Rosenblum, D., and Wolf, A. A Design Framework for Internet-Scale Event Observation

....the system, it leads to the ability of dynamically reconfiguring the system. Decoupling can be obtained by carefully designing the communication paradigm that regulates the interaction among component. This is one of the main characteristics of the event based communication paradigm, as shown in [5]. In OPELIX we use the event based paradigm in combination with point to point communication to guarantee component decoupling when needed. In particular, we use events to externalize all relevant state changes occurring in a component. Thanks to this externalization, all components can make ....

....chosen to exploit the JEDI prototype since it was available to us and we had a good knowledge of it. Of course, any other platform could have been used. As any other middleware, JEDI imposes specific constraints on the implementation of the components that exploit it. Such constraints concern [5]: 1) the structure to be used for creating events and subscriptions, 2) the syntax (APIs) to be used for issuing subscriptions and for publishing event notifications and (3) the semantics used to check compatibility between subscriptions and notifications. As a consequence of these ....

D. S. Rosenblum and A. L. Wolf. A design framework for internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE), 1997.

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D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344--360. Springer--Verlag, 1997.

No context found.

D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and noti cation. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344-360. Springer{Verlag, 1997.

No context found.

D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344--360. Springer--Verlag, 1997.

....while senders simply inject messages into the network at the periphery. The network is responsible for delivering to each receiver any and all messages matching the filter declared by that receiver. An ideal application for a content based network is a publish subscribe event notification service [2, 3, 6, 13, 14], where a filter represents a subscription and a message represents a published event. As in traditional address based networks, the delivery function is performed incrementally by passing messages between intermediate nodes in the network. We say that messages flow from upstream nodes to ....

D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344--360. Springer--Verlag, 1997.

....while senders simply inject messages into the network at the periphery. The network is responsible for delivering to each receiver any and all messages matching the filter declared by that receiver. An ideal application for a content based network is a publish subscribe event notification service [2, 3, 6, 13, 14], where a filter represents a subscription and a message represents a published event. As in traditional address based networks, the delivery function is performed incrementally by passing messages between intermediate nodes in the network. We say that messages flow from upstream nodes to ....

D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344--360. Springer--Verlag, 1997.

No context found.

. D. Rosenblum and A. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference. LNCS, number 1301, pages 344-360. Springer-Verlag, 1997.

....loose coupling that characterize widearea network applications promote event interaction as a natural design abstraction for a growing class of software systems. The glue that ties components together in an event based architecture is an infrastructure that we call an event notification service [31]. The most primitive event notification service is one that provides facilities for notifications to be delivered to explicitly addressed components. A somewhat more sophisticated service receives notifications from components and delivers those notifications to any and all other components in the ....

D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344--360. Springer--Verlag, 1997.

....paper, and as we said, it should result from a joint effort of researchers and practitioners in the field. Here we list a number of general features that we believe should be included in the capability model. Elements of this list have been extensively studied within other evaluation frameworks [4, 5, 2, 8]. publication model: data model for publisheable data. This model should classify services according to the following parameters: structure: characterizes the structure of notifications. Typical publications can be classified as: unstructured, lists of strings, record like structures with ....

D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference, number 1301 in Lecture Notes in Computer Science, pages 344--360. Springer--Verlag, 1997.

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D. S. Rosenblum and A. L. Wolf, "A design framework for internet-scale event observation and notification," in Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE 97) (M. Jazayeri and H. Schauer, eds.), pp. 344--360, Springer--Verlag, 1997.

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D. S. Rosenblum and A. L. Wolf, "A Design Framework for Internet-Scale Event Observation and Notification," in Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE 97), M. Jazayeri and H. Schauer, Eds. Germany: Springer-Verlag, 1997, pp. 344-360.

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Rosenblum, D.S., Wolf, A.L.: A design framework for internet-scale event observation and notification. In Jazayeri, M., Schauer, H., eds.: Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE 97), Springer--Verlag (1997) 344--360

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D. S. Rosenblum and A. L. Wolf. A design framework for Internet-scale event observation and notification. In M. Jazayeri and H. Schauer, editors, Proceedings of the 6th European conference on Foundations of Software Engineering (ESEC/FSE '97), volume 1301 of LNCS, pages 344--360. Springer / ACM Press, 1997.

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D.R. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In 6th European Software Engineering Conference / 5th ACM SIGSOFT Symposium on Foundations of Software Engineering, pages 344--360, Zurich, Switzerland, 1997.

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D. Rosenblum and A. Wolf. A design framework for internet-scale event observation and notification. In 6th European Software Engineering Conference/ACM SIGSOFT 5th Symposium on the Foundations of Software Engineering, pages 344--360, September 1997.

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D. S. Rosenblum and A. L. Wolf, "A Design Framework for Internet-Scale Event Observation and Notification," presented at 6th European Software Engineering Conference/5th ACM SIGSOFT Symposium on the Foundations of Software Engineering, Zurich, Switzerland, 1997.

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Rosenblum, D. S. and Wolf, A.L., "A Design Framework for Internet-Scale Event Observation and Notification, " in ESEC / SIGSOFT FSE 1997, pp. 344-360

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Rosenblum, D. S. and Wolf, A. L. A Design Framework for Internet-Scale Event Observation and Notification, in 6th European Software Engineering Conference/5th ACM SIGSOFT Symposium on the Foundations of Software Engineering, (Zurich, Switzerland, September 1997), Springer-Verlag, pp. 344-360.

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David S. Rosenblum, Alexander L. Wolf, "A Design Framework for Internet-Scale Event Observation and Notification", Proc. of 6th European Conf. on Foundations of Software Engineering held jointly with 5th ACM SIGSOFT Symposium on Software Engineering, Zurich (September 1997.

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David S. Rosenblum and Alexander L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proceedings of the 6th European Software Engineering Conference/ACM SIGSOFT 5th Symposium on the Foundations of Software Engineering, Zurich, Switzerland, September 1997.

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D. S. Rosenblum and A. L. Wolf, "A Design Framework for Internet-Scale Event Observation and Notification," presented at 6th European Software Engineering Conference/5th ACM SIGSOFT Symposium on the Foundations of Software Engineering, Zurich, Switzerland, 1997.

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David S. Rosenblum, Alexander L. Wolf, "A Design Framework for Internet-Scale Event Observation and Notification", Proc. of 6th European Conf. on Foundations of Software Engineering held jointly with 5th ACM SIGSOFT Symposium on Software Engineering, Zurich (September 1997.

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D.S. Rosenblum and A.L. Wolf, "A Design Framework for InternetScale Event Observation and Notification," in Proc. of the 6 European Software Engineering Conf. (ESEC/FSE). Sept. 1997, LNCS 1301, Springer.

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D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc.

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David S. Rosenblum and Alexander L. Wolf. A design framework for internet-scale event observation and notification. In Proceedings of the Sixth European Software Engineering Conference / ACM SIGSOFT Fifth Symposium on the Foundations of Software Engineering, pages 344--360, September 1997.

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D. Rosenblum and A. Wolf. A design framework for internet-scale event observation and notification. In Sixth European Software Engineering Conference /ACM SIGSOFT Fifth Symposium on the Foundations of Soft ware Engineering, September 1997.

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Rosenblum, D.S., and Wolf, A.L. A Design Framework for Internet-Scale Event Observation and Notification. Proc. 6th European Software Engineering Conference/5th ACM SIGSOFT Symposium on the Foundations of Software Engineering, Zurich, Switzerland, 334-360, September 1997.

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D. S. Rosenblum and A. L. Wolf, "A design framework for internet-scale event observation and notification," in Proceedings of the Sixth European Software Engineering Conference (ESEC/FSE 97) (M. Jazayeri and H. Schauer, eds.), pp. 344--360, Springer--Verlag, 1997.

No context found.

D. Rosenblum and A. Wolf. A design framework for internet-scale event observation and notification. In 6th European Software Engineering Conference/ACM SIGSOFT 5th Symposium on the Foundations of Software Engineering, pages 344--360, September 1997.

No context found.

D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc. of the 6 European Software Engineering Conf. held jointly with the 5 Symp. on the Foundations of Software Engineering (ESEC/FSE97), LNCS 1301, Zurich (Switzerland), September 1997. Springer.

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D.S. Rosenblum and A.L. Wolf. A design framework for internet-scale event observation and notification. In Proc. of the Sixth European Soft. Eng. Conf.; Zurich, Switzerland; LNCS 1301, pages 344--360. Springer-Verlag, September 1997.

No context found.

D.R. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In 6th European Software Engineering Conference / 5th ACM SIGSOFT Symposium on Foundations of Software Engineering, pages 344--360, Zurich, Switzerland, 1997.

No context found.

D.S. Rosenblum and A.L. Wolf. A Design Framework for Internet-Scale Event Observation and Notification. In Proc. of the 6 European Software Engineering Conf. held jointly with the 5 Symp. on the Foundations of Software Engineering (ESEC/FSE97), LNCS 1301, Zurich (Switzerland), September 1997. Springer.

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