Hohl, Fritz. Konzeption eines einfachen Agentensystems und Implementation eines Prototyps. Diplomarbeit, Universitt Stuttgart, Abteilung Verteilte Systeme, August 1995.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....for that site [MMS95b] computingScience :Site(Tuple persons :Persons . end) administration :Site(Tuple insertAll( Addresses) Ok . end) Abstracting from the (significant) differences in typing and naming, this programming style is very similar to the one used in Telescript [GM95a] Mole [Hoh95], Facile [Kna95] or Obliq [Card94] Unfortunately, such a programming style does not scale well to cooperative information systems since it inherits many of the deficiencies described in the previous section: the agent accesses directly through methods (admin.insertAll) or even through ....

Hohl, Fritz. Konzeption eines einfachen Agentensystems und Implementation eines Prototyps. Diplomarbeit, Universitt Stuttgart, Abteilung Verteilte Systeme, August 1995.

....8 . 3.5.2 Mobile Stateful Software Entities This section discusses software entities, which are movable with their state. The state of a software entity is given by all run time instantiations, which belong to a specific software entity. This category includes the big field of mobile agents [HCK95, Har95, Hoh95] and movable (stateful) application systems [KL96] Within this category we can distinguish between autonomous and non autonomous mobile stateful software entities. Autonomous means that a stateful entity can itself decide to migrate to another location. In the case of a non autonomous ....

....to migrate. An example of non autonomous stateful entities in the domain of electronic mail is active mail [Bor92, BR93] Code representation of mobile stateful entities can be low level or high level. For instance, an example of a mobile agent system with low level code representation is [Hoh95] (see also the MOLE project 9 ) and Aglets (mobile agents in Java 10 ) Examples with high level code representations are active mail with Safe Tcl [BR93] and Penguin 11 . One example of a stateful mobile application system written in Obliq is described in [KL96] 3.5.3 Mobile Stateless ....

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F. Hohl. Konzeption eines einfachen Agentensystems und Implementation eines Prototyps. Master's thesis, University of Stuttgart, August 1995.

....the Laptop is not connected to the network, the docking computer serves as target for the agent. Security services, based on Safe Tcl, protect a computer from malicious agents. Security services to protect agents against malicious environments have not been realised yet. Mole [Straer et al. 96] Hohl 95] is the prototype of an agent system. Stationary System Agents manage the resources and services of one place (set of computers) If mobile User Agents visit these places, the System Agent assigns special resources or services to these User Agents. Mole supports local and global communication ....

Hohl F. (1995). Konzeption eines einfachen Agentensystems und Implementation eines Prototyps. IPVR (Institute for Parallel and Distributed Computer Systems), University of Stuttgart.

....by Chess et al. 7] Goldszmidt and Yemini [13] extend the notion of an agent infrastructure to encompass real time control and system management. A proprietary agent infrastructure is described by White [26,27] Proposals abound for agent implementation languages: Safe )Tcl [6,23] Java [14,18] and Telescript [27,28] seem to be some of the more important contenders. An Infrastructure for Mobile Agents In this section we consider the requirements that mobile agents place on the systems they re running on, and vice versa. Why Do Agents Need an Infrastructure To be useful, an agent ....

Hohl, Fritz, Konzeption eines einfachen Agentensystems und Implementation eines Prototyps, Diplomarbeit, Universität Stuttgart, August 1995.

....agents programs that can move around in a computer network on behalf of their users are attracting more and more attention. Various research efforts take place in this area, for example TACOMA (Troms and Cornell, 1] Ara (Universit at Kaiserslautern, 2] Mole (Universitat Stuttgart, [3]) and the projects InAMoS and InAVAS of the DAI Laboratory TU Berlin [4] Several interpreted languages are suitable for the programming of mobile code. Among them Java [5] Tcl (with extensions like [incr tcl] or AgentTcl) 6] Python [7] and Perl [8] Commercially available systems include ....

Fritz Hohl. Konzeption eines einfachen Agentensystems und Implementation eines Prototyps. Diplomarbeit, Universitat Stuttgart, August 1995.

....the means of object serialization. Because of this, we found that it is very easy to implement a system that provides rudimentary mobile agent functionality. This is also supported by the fact that there are several other research projects that deal with Java based mobile agent systems like Mole [Hoh95], Aglets [Lan96] Java to go [Wei96] and MOA [Mil96] To gain insight in Java s potential as an agent programming language, and because of announced Java API packages (i.e. security and electronic commerce) that offer valuable functionality in a standardized way, we decided to build a system of ....

....of control cannot directly be reestablished to that point in the code of the Web agent where it executed the go method. We consider this not to be a conceptual drawback 6 , although this puts some burden on the programmer of the Web agent. As other systems that use this scheme of migration (Mole [Hoh95], Aglets [Lan96] FFM [Lin95] Tacoma [Joh95] we provide a special method which is called by the target SAE when it restarts the flow of control for a migrated Web agent. The agent programmer has to fill this method in such a way that its agent will execute the correct code depending on its ....

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Hohl F., Konzeption eines einfachen Agentensystems und Implementation eines Prototyps, Diploma Thesis, Universitat Stuttgart, Fakultat Informatik, Diplomarbeit Nr. 1267 (1995)

....the means of object serialization. Because of this, we found that it is very easy to implement a system that provides rudimentary mobile agent functionality. This is also supported by the fact that there are several other research projects that deal with Java based mobile agent systems like Mole [7], Aglets [10] Java to go [16] and MOA [14] To gain insight in Java s potential as an agent programming language, and because of announced Java API packages (i.e. security and electronic commerce) that offer valuable functionality in a standardized way, we decided to build a system of our own ....

....of control cannot automatically be reestablished to that point in the code of the Web agent where it executed the go method. We consider this not to be a conceptual drawback, although this puts some burden on the programmer of the Web agent. As other systems that use this scheme of migration (Mole [7], Aglets [10] FFM [11] Tacoma [9] we provide a special method which is called by the target SAE when it restarts the flow of control for a migrated Web agent. The agent programmer has to fill this method in such a way that its agent will execute the correct code depending on its internal ....

[Article contains additional citation context not shown here]

Hohl F., Konzeption eines einfachen Agentensystems und Implementation eines Prototyps, Diploma Thesis, Univ. Stuttgart, Dept. of CS , Nr. 1267 (1995)

....the access request. This can easily be achieved by installing an instance of an object that conforms to the Java Virtual Machine (VM) SecurityManager interface, which when installed is called by all Java methods that access system resources. In our system (and in all other Java based systems [10, 14, 21, 34]) the code of the mobile agent system and the code of agents is loaded into the same Java VM. Because of that, the installed security manager cannot automatically deny any access to local resources, because the mobile agent system itself has to access the local resources. To solve this problem, ....

Hohl F., Konzeption eines einfachen Agentensystems und Implementation eines Prototyps, Diploma Thesis, Univ. of Stuttgart, Dept. of CS, Diplomarbeit Nr. 1267 (1995)

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Hohl 95: Hohl, Fritz. Konzeption eines einfachen Agentensystems und Implementation eines Prototyps. Diplomarbeit, Universitaet Stuttgart, Abteilung Verteilte Systeme, August 1995.

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