JOSEPH (A. D.), TAUBER (J. A.), KAASHOEK (M. F.), Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers: Special issue on Mobile Computing, (1997), 46, n # 3, pp. 337--352.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... placement problem for programs written as distributed components [21] Also several different forms of offloading of applications between mobile clients and surrogates have been examined for resourceconstrained devices, most notably with ParcTab, MPad, Infopad, Wit and Rover [31] 32] 33] [18]. The most notable method for dealing with resource constraint problems is to reduce application functionality. Typical examples are the lightweight versions of the popular Office applications included with the Windows CE PocketPC platform [16] and various Java editions [29] However, this ....

A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers, 46(3):337--352, 1997.

....details on performance can be found in [13] 0 Figure 7. Trace data for FEC(6,4) audio FEC. 6. Related Work Recently, several research groups have started to address the issue of adaptive middleware frameworks that can accommodate dynamic, heterogeneous infrastructures. Examples include Rover [8], BARWAN [19] MASH [11] TAO [9] Mobiware [1] the Middleware Control Framework [10] QuO [23] Odyssey [18] and DaCapo [22] These projects have greatly improved the understanding of how middleware can accommodate device heterogeneity and dynamic network conditions, particularly in the area ....

A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3), March 1997.

....more serious attempts in the direction of using traditional middleware using a sort of semi asynchronous paradigm. Some involved RPC based middleware enhanced with queueing delaying or bu#ering capabilities in order to cope with intermittent disconnections. Example of these behaviours are Rover [32] or Mobile DCE [65] As we write, an implementation of the message oriented middleware JMS (Java Messaging Server) has been released [68] It supports point to point and publish subscribe models, that is a device can either communicate with a single otehr (through its queue) or register on a ....

....and opportunistic as it exploits connectivity whenever it becomes available. The synchronous communication paradigm supported by many traditional distributed systems has to be replaced by a new asynchronous communication style. As we have seen, some attempts based on events [76] or queues (Rover [32] or Mobile JMS [68] have been devised. However, a completely asynchronous and decoupled paradigm (tuple space based) have also been isolated as e#ective in mobile settings. Although not initially designed for this purpose (their origins go back to Linda [26] a coordination language for ....

A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile Computing with the Rover Toolkit. IEEE Transactions on Computers, 46(3), 1997.

....oqp r s#t0u#r0vKwKx oqp r s vyw x Figure 9. Reliable multicast latency. 6 Related Work In recent years, numerous research groups have addressed the issue of adaptive middleware frameworks that can accommodate dynamic, heterogeneous infrastructures. Examples include Adapt [12] MOST [14] Rover [16], MASH [27] TAO [24] dynamicTAO [22] MobiWare [4] MCF [25] QuO [43] MPA [36] Odyssey [34] DaCapo [39] RCSM [44] and Sync [33] In addition, several higher level frameworks have been designed to support wearable ubiquitous applications; examples include Hive [32] Ektara [9] and Proem ....

A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3), March 1997.

....resource availability. As a consequence, mobile applications need to be capable of adapting to these changes to ensure they offer the best possible level of service to the user [10, 14] Early adaptive systems have tended to focus on the specific limitations introduced by wireless connectivity [13, 21, 10]. However, more recently there has been an increasing interest in applications that adapt to a wider range of general environmental and contextual triggers, e.g. changes in a system s physical location or based on a set of personal preferences. The GUIDE system [1, 2] for example, supplies users ....

....might be requested to reduce its demand for network bandwidth or disk usage. Consideration of this framework enables a classification of current systems according to the types of flows supported. For example, network based adaptive systems such as BAYOU[25] Odyssey [21] MOST [10] and Rover [13] support flows A and C. Context aware applications like GUIDE [1, 2] Stick e Notes [22] and Cyberguide [18] are based on flow B, representing the access to the context sensors , and flow C representing the information flowing from the sensors to the application. Provision of a flow of control ....

A. Joseph, J. Tauber, and F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 43(3), 1997.

....that can occur in current adaptive systems and conclude with a set of requirements for our approach. 2.1. Defining the Problem Early approaches to supporting adaptive mobile systems were mainly concerned with the impact of the variations in network QoS due to the wireless communication links [9, 11, 17]. More recent approaches consider other attributes that can become triggers for adaptation, such as power supply [7, 8] So far all these adaptation mechanisms operate in isolation with little or no concern about their interdependencies, though the requirement for such a concern has been ....

....have been implemented in an ad hoc manner [1, 18] Such applications are clearly unaware of other applications operating on the system and cannot take into account any side effects that their reaction may have on the rest of the system. In adaptive middleware designed to support mobile systems [11, 17, 3] there is a certain level of awareness of multiple applications operating on the system. The level of control over these applications however, is limited to the predefined adaptation policies built into the applications, the underlying middleware platforms or the operating system itself. In more ....

[Article contains additional citation context not shown here]

A. Joseph, J. Tauber, and F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 43(3), 1997.

....e.g. the affect on other attributes such as power, network bandwidth etc. Consideration of this framework enables a classification of current systems according to the types of flows supported. For example, network based middleware systems such as BAYOU [22] Odyssey [18] MOST [10] and Rover [11] support flows B and C. In this case the application specifies QoS requirements for the network channel and the underlying platform tries to achieve these requirements. However, if this is not possible then applications are notified in order to enable adaptation to take place. Application A B C ....

Joseph A., J. Tauber and F. Kaashoek. "Mobile Computing with the Rover Toolkit". IEEE Transactions on Computers: Special issue on Mobile Computing, 43(3), 1997.

....might be requested to reduce its demand for network bandwidth or disk usage. Consideration of this framework enables a classification of current systems according to the types of flows supported. For example, network based adaptive systems such as BAYOU [18] Odyssey [16] MOST [8] and Rover [10] support flows A and C. Context aware applications like GUIDE [2,3] Stick e Notes [17] and Cyberguide [14] are based on flows B and C. In more detail, for these applications, flow B represents the access to the various context sensors while flow C represents the information flowing from the ....

Joseph A., J. Tauber, F. Kaashoek.: Mobile Computing with the Rover Toolkit. In: IEEE Transactions on Computers: Special issue on Mobile Computing, 43(3), (1997)

....with hard to analyse, informal semantics. Current research on infrastructure and middleware for distributed systems, taking into account new concerns such as mobility and adaptability has resulted in the introduction of various distributed programming models, including e.g. support for mobility [18, 21], support for large scale distribution and replication [31] support for real time and multimedia constraints [15] support for event based computations [3] Since most of these works su#er from the same problem of diverging models, a recent body of work introduces some form of structural and ....

A. Joseph, J. Tauber, and F. Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, Vol. 46, No. 3, 1997.

....mobile nodes have been addressed in several other projects, and many systems address the problem of variable supply of resources in mobile computers. The duality of system and application control, captured in the term application aware adaption is addressed in projects like Odyssey [103] Rover [74] and Barwan [26] Projects like INRIA s Project SOR [16] target at minimizing user annoyance when disconnected, and seek solutions in providing transparency to mobility by identifying and using locally available resources. In general, the projects tend to address problems related to system ....

JOSEPH, A. D., TAUBER, J. A., AND KAASHOEK, M. F. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing (Mar. 1997), 337--352. 153

....with hard to analyse, informal semantics. Current research on infrastructure and middleware for distributed systems, taking into account new concerns such as mobility and adaptability has resulted in the introduction of various distributed programming models, including e.g. support for mobility [21,23], support for large scale distribution and replication [31] support for real time and multimedia constraints [29] support for event based computations [3] Since most of these works suffer from the same problem of diverging models, a recent body of work introduces some form of structural and ....

Joseph, A.D., Tauber, J.A., Kaashoek, M.F. Mobile Computing with the Rover Toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, Vol. 46, No. 3, March 1997.

....to bandwidth availability; several systems provide more general adaptation mechanisms to applications. Odyssey [3] allows applications on a mobile host to adapt to changes in availability of many kinds of resources; the bandwidth callback mechanism in ATP is copied from Odyssey s upcalls. Rover [14] focuses on placing components of mobile applications to control communication between mobile clients and servers. ATP has some similarities to Rover s Queued RPC. HATS [15] regulates the transmission of documents over a bandwidth constrained link, dividing them into hierarchies of data units and ....

Anthony D. Joseph, Joshua A. Tauber, and M. Frans Kaashoek, "Mobile computing with the Rover Toolkit," IEEE Transactions on Computers: Special issue on Mobile Computing, vol. 46, no. 3, pp. 337--352, Mar. 1997.

.... computing is that application aware adaptation is essential for coping with wide variations in network conditions and limited local resource availability brought by mobility [34, 35] The need for network awareness and services that expose mobility to the application was identified by many others [23, 13, 22, 43]. Katz, for instance, noted the need for adaptation of mobile systems to a variety of network environments [23] Davies et al. emphasized the need for protocols to provide feedback about the network to applications in a vertically integrated application environment [13] Joseph et al. pointed out ....

.... the need for protocols to provide feedback about the network to applications in a vertically integrated application environment [13] Joseph et al. pointed out that applications operating in the harsh conditions of a mobile environment must often be aware of and adapt to those conditions to excel [22]. 5.3 Ad Hoc Networking Discovery and sending information beyond the immediate neighborhood in ad hoc networks inevitably needs to deal with message routing. Much work has been done to develop new routing protocols for the mobile ad hoc environment. Protocols such as Dynamic Source Routing(DSR) ....

A.D. Joseph, J.A. Tauber, and M.F. Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers, 46(3):337--352, March 1997.

....to mitigate these effects. Finally, we did not look at disconnected operation, instead assuming connectivity of varying quality. We believe that disconnected operation is an important capability for mobile users; we left it out only because there are several major projects that address the issues [39 41], and because we believe that those systems are complementary to our work. Related Projects There are at least several hundred useful papers that relate to some aspect of the architecture; here we focus only on broad projects of similar scope. For detailed coverage of related work in a specific ....

....(predictive caching and data consistency) and disconnected operation. However, it does not (so far) address the issues of overlaid networks, reliable data transport, or scalable complex infrastructure services. The proxy architecture has emerged as fundamental to nomadic computing. Rover [41] is a toolkit for developing mobile applications that support disconnected operation. As with Coda, the Rover work is complementary, and we expect to integrate the Rover technology into our future work in this area. The proxy architecture and network services work simplify the infrastructure side ....

A. D. Joseph, J. A. Tauber, and M. Frans Kaashoek, "Mobile Computing with the Rover Toolkit," IEEE Trans. Comp., Special Issue on Mobile Computing, vol. 46, no. 3, Mar. 1997.

....communication yet continue to provide a user with some level of functionality. In particular, applications based on the Remote Procedure Call (RPC) model [14] where each communication is a request reply exchange, have been successfully adapted for disconnected operation using the Rover toolkit [51], which queues RPC for later delivery. In addition to queuing RPCs, the Rover toolkit can emulate Coda s hoarding process; instead of copying or relocating files, Rover relocates the remote session end point to the mobile host through the use of dynamic objects. When both end points are located on ....

Anthony D. Joseph, Joshua A. Tauber, and M. Frans Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers, 46(3):337--352, March 1997.

....only groups of Solaris processes could be migrated. Other work has looked at migration and checkpointing at process and object granularities. Systems working at process level include V[26] Condor[16] libckpt[21] and CoCheck[25] Object level systems include Legion[10] Emerald[14] and Rover[13]. LBFS[19] provided inspiration for HCP and the hash cache. Whereas LBFS splits blocks based on a fingerprint function, HCP hashes page aligned pages to improve performance on memory and disk images. Manber s SIF[17] uses content based fingerprinting of files to summarize and identify similar ....

A. Joseph, J. Tauber, and M. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers, 46(3):337--352, March 1997.

....such as inter process communication. This severely limits the kind of applications that can be used with such systems. Several systems have been developed that provide migration using object based approaches. These systems include Abacus [5] Emerald [19] Globus [13] Legion [14] and Rover [18]. These systems are designed as programming languages or middleware toolkits that typically require explicit programmer control to utilize migration. By operating at a higher level of abstraction, these systems can reduce the amount of state that needs to be recorded and moved to migrate an ....

A.D. Joseph, J. A. Tauber, and M. F. Kaashoek, Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers, 46(3):337-352, March 1997.

....as possible. Similar, in wide area systems, we cannot accept that an operation is delayed until a previous one is completed. To solve these problems, we introduced view series that are used to implement a notion of tentative data. Our mechanism resembles queued RPCs as used in the Rover toolkit [28], except that we maintain the ordering of invocations. In this sense, view series are comparable to senderbased message logging used for recovery from node and network failures as explained in [29] Mobile Object Systems An implicit assumption that location management services for mobile ....

A.D. Joseph, J. A. Tauber, and M. F. Kaashoek. "Mobile Computing with the Rover Toolkit." 1EEE Trans. Cornput., 46(3):337352, Mar. 1997.

....resolving conflicts or ask the user in case of conflicts. A follow on platform, Odyssey [6] extends data distribution to multimedia data such as video or audio data. To support real time data, bandwidths and available resources have to be monitored. Odyssey applications are mobility aware. Rover [7] supports mobility transparent as well as mobility aware applications. To run without modification, network based applications such as Web browsers and News readers can use network proxies. The development of mobility aware applications is supported by two mechanisms: relocated dynamic objects ....

Joseph AD, Tauber JA, Kaashoek MF. Mobile computing with the Rover Toolkit. IEEE Transactions on Computers 1997; 46: 337--352

....Chapter 4 reviews current mobile systems and presents a classification based on two dimensions: 1) the system s mobile client server model, and (2) its adaptive 7 capabilities. The systems included in this taxonomy include: Coda [KS92, Sat96] Web Browsing [PS98] Odyssey [Sat96, Saty96] Rover [JTK97] and Pro motion [WC97] In addition, we explain where the View holders [WLC98, WLC99] approach to mobile computing exists within this classification. Within a mobile environment, a agent is an entity within the network that is designed to perform a task on behalf of the mobile client. Our ....

....section, we review current mobile systems and present a classification based on two dimensions: 1) the system s mobile client server model, and (2) its adaptive capabilities. The systems included in this classification include: Coda [KS92, Sat96] Web Browsing [KJ01] Odyssey [NSN 97] Rover [JTK97] and Pro motion [WC97] see Figure 4.1. 2 We have changed the name of this approach from the original term of application aware [Saty96] in order to clarify that under this scenario the client s application must be created or modified so that it is explicitly aware of operating within a mobile ....

[Article contains additional citation context not shown here]

A. Joseph, J. Tauber, and M. Kaashoek. Mobile Computing with the Rover Toolkit. IEEE Trans. on Computers: Special issue on Mobile Computing, 43(3), 1997.

....with in that they must cope with consistency problems. If a computer is removed from its network, then it is unable to verify such things as access permissions or file consistency. Several systems have been developed to support reintegration of file systems with mobile components, including [90, 100, 107, 173]. Jing et al. present an extensive overview of work in this area in [99] CHAPTER 2. RELOCATION TRANSPARENCY IN EXISTING SYSTEMS 31 What is of greater interest is the development of Mobile IP [93] which has been designed to extend the location dependent naming scheme (using IP) to support ....

A.D. Joseph, J.A. Tauber and M.F. Kaashoek. Mobile Computing with the Rover Toolkit. IEEE Transactions on Computers, Volume 46, Number 3, pages 337--352, March 1997.

....client application. 6 Related Work and Discussion The research described in this paper is very closely related to several recently proposed infrastructures that aim to augment the traditional notion of a network path with injected application specific components, either only at the end points [14, 8, 11] or throughout the path [17, 10, 2, 20, 4, 1, 22, 6] Rather than describe all such systems, we focus our attention here on the subset which offer some form of automatic support for path creation and reconfiguration. The Ninja project s Automatic Path Creation (APC) service [6] also used in the ....

A. D. Joseph, J. A. Tauber, and M. F. Kasshoek. Mobile Computing with the Rover Toolkit. IEEE Transaction on Computers:Special Issue on Mobile Computing, 46(3), March 1997.

....concurrency, other systems have tried to accommodate the resolution of con icts after they have occurred. These mechanisms are built into the system and allow for an application to de ne their resolution procedures based on application semantics. Examples of such systems are Coda, Bayou, and Rover [13, 6, 12]. Coda is speci cally designed for le systems. It uses an optimistic concurrency control scheme meaning that any client can update its copy of a piece of data. Coda automatically resolves concurrent updates to directories and also has a mechanism for transparent resolution of le con icts called ....

....manual repair. Rover is very di erent from Coda or Bayou. It essentially provides a framework for queued remote procedure calls between a disconnected client and a central server. 22 Client applications cache objects from the servers and queue operations made on those objects while disconnected [12]. Rover provides clients with facilities for con ict detection and resolution, however unlike Coda or Bayou, the system itself has no notion of problems arising from concurrent updates to the same object. The application must specify what a con ict is, even in the case of two clients updating ....

Anthony D. Joseph, Joshua A. Tauber, and M. Frans Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 1997.

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JOSEPH (A. D.), TAUBER (J. A.), KAASHOEK (M. F.), Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers: Special issue on Mobile Computing, (1997), 46, n # 3, pp. 337--352.

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Joseph A. D., Tauber J. A., Kaashoek M. F.: Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers, Vol. 46, No. 3, March 1997, 337-352

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JOSEPH,A.D.,TAUBER,J.A.,AND KAASHOEK,M.F. Mobile computing with the rover toolkit. IEEE Trans. on Computers 46, 3 (Mar. 1997), 337--352.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers, 46(3):337--352, 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile Computing with the Rover Toolkit. IEEE Transactions on Computers, 46(3):337--352, 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, Mar 1997.

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A.D. Joseph, J.A. Tauber, and M.F. Kaashoek. "Mobile computing with the Rover toolkit." IEEE Transactions on Computers, 46(3), November 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3), March 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3), March 1997.

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Anthony D. Joseph, Joshua A. Tauber, and M. Frans Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers, 46(3):337--352, 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek, "Mobile computing with the Rover toolkit," IEEE Transactions on Computers: Special issue on Mobile Computing, vol. 46, March 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek, "Mobile Computing with the Rover Toolkit," IEEE Transactions on Computers: Special issue on Mobile Computing, vol. 46(3), March 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 1997.

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Anthony D. Joseph, Joshua A. Tauber, and M. Frans Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers, 46(3):337-352, 1997.

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Joseph A., Tauber J., Kaashoek M., "Mobile computing with the Rover toolkit", IEEE Transactions on Computers, 46(3), 1997.

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A.D. Joseph, J.A. Tauber, and M.F. Kaashoek, "Mobile Computing with the Rover Toolkit," IEEE Trans. Computers, special issue on mobile computing, vol. 46, no. 3, Mar. 1997.

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A. Joseph, J. Tauber, and M. Kaashoek. "Mobile Computing with the Rover Toolkit," IEEE Transactions on Computers, 46(3), pp. 337-352, March 1997.

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A. Joseph, J. Tauber, and M. Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computer Systems, 10(1):3--25, 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover Toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3):337--352, Mar. 1997.

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A. Joseph, J. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3), Mar. 1997.

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JOSEPH (A. D.), TAUBER (J. A.), KAASHOEK (M. F.), Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers: Special issue on Mobile Computing, (1997), 46, n # 3, pp. 337--352.

No context found.

Anthony D. Joseph, Joshua A. Tauber, and M. Frans Kaashoek. Mobile computing with the rover toolkit. IEEE Transactions on Computers, 46(3):337--352, 1997.

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Joseph, A., Tauber, J., Kaashoek, M., Mobile computing with the Rover toolkit. IEEE Trans. Computers, Mar. 1997.

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A. D. Joseph, J. A. Tauber, and M. F. Kaashoek. Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing, 46(3), March 1997.

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Joseph A. D., Tauber J. A., Kaashoek M. F.: Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers, Vol. 46, No. 3, March 1997, 337-352

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Joseph A. D., Tauber J. A., Kaashoek M. F.: Mobile Computing with the Rover Toolkit, IEEE Transactions on Computers, Vol. 46, No. 3, March 1997 337-352

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Joseph, A.D., Tauber, J.A., Kaashoek, M.F.: Mobile computing with the Rover toolkit. IEEE Transactions on Computers: Special issue on Mobile Computing 46 (1997)

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