SOMA is available at http://lia.deis.unibo.it/Research/SOMA/. .... be tagged with names that are compliant to the Internet Domain Name Serv0 ice, and can exploit ...
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7HOHFRPPXQLFDWLRQV DQG GLVWULEXWHG V\VWHPV DUH FRQYHUJLQJ LQ WKH GHILQLWLRQ RI WKH UHTXLUHPHQWV IRU PRELOH FRPSXWLQJ WR SHUPLW WKH GHYHORSPHQW RI LQIUDVWUXF WXUHVVXLWDEOHIRUDFFRPPRGDWLQJSRUWDEOHFRPSXWLQJGHYLFHVIRUVXSSRUWLQJXVHU URDPLQJ DQG IRU RIIHULQJ QHZ PRELOLW\HQDEOHG DSSOLFDWLRQ VHUYLFHV The traditional Internet architecture provides the interconnection of fixed devices, and is under extension to transform into an integrated infrastructure to support mobility. In particular, two forms of mobility, associated with terminals and users, are
widely accepted and recognized. Terminal mobility permits mobile devices to roam in the global system maintaining the same ability of service access and provision [1]. User mobility provides users a uniform vision of their working environment and of all subscribed services independently of their point of attachment [2]. In addition, we extend the concept of mobility to resources that can be dynamically reallocated and continue to provide services to (possibly mobile) entities. Throughout the paper, the term session mobility identifies the terminal, user and resource mobility provided by the support, and mobile service identifies the applications that operate in a scenario where terminals, users and resources can migrate during service provision. The support of session mobility requires a flexible distributed infrastructure capable of dynamic reallocation, of identifying and tracing mobile entities, and of permitting entity communication and coordination. Mobility in open environments also stresses the necessity to grant the required security level and to deal with heterogeneous systems. The variety of devices, operations and systems makes it necessary to overcome heterogeneity, by introducing practices and methodologies to define standard and to integrate legacy components. The openness of the system and the potential presence of malicious intruders require to prevent attacks and to make available suitable security tools. Many proposals have identified code mobility as a central point for the provision of all the above features [3, 4, 5, 6]. Code mobility permits the dynamic upgrading of hosting environments by need depending on the evolution of the system, without suspending operations. This extendibility has motivated the increasing interest in new mobile code technologies, and, in particular, in the Mobile Agent (MA) one that permits to move computing entities in execution together with their state. We claim that a mobile agent approach suits well the realization of a highly adaptive distributed infrastructure to support mobile sessions. This paper presents * the distributed infrastructure of SOMA (Secure and Open Mobile Agents), and, in particular, its mobility add-on module. SOMA allows all components to move autonomously and to adapt to the current situation, to the current position of the user, and to the current characteristics of her attachment point. The SOMA environment also stresses the two design guidelines identified above: security and openness [7]. These become crucial requirements for the acceptance of a programming framework in an open untrusted scenario. From the point of view of terminal mobility, SOMA provides a peculiar locality abstraction, called mobile place, that models the concept of an agent locality hosted on a mobile terminal such as a laptop. The laptop, together with the mobile place, is able to move during execution and to connect/disconnect to/from different networks. The SOMA support is capable of recognizing the connection/disconnection of the mobile place and of adapting to its current position by
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reconfiguring the needed services and the resources. From the point of view of user mobility, the SOMA infrastructure permits to recognize the login/logout of any identified user and to dynamically rearrange the service infrastructure. This creates a scenario that offers subscribed services in a uniform way independently of the current user location and the particular type of used device. Resource mobility is supported in SOMA by mobile agents that encapsulate physical resources and hide from the user details of the reallocation and distributed implementation of resources. The binding between a logical resource and its physical implementation is managed by the agent-based infrastructure. 7KH SDSHU GHWDLOV KRZ WKH 620$ LQIUDVWUXFWXUH LPSOHPHQWV WKH VXSSRUW IRU WHUPLQDO XVHU DQG UHVRXUFH PRELOLW\ DQG UHSRUWV WKH FRVWV RI VHVVLRQ PRELOLW\ PHDVXUHGLQGLIIHUHQWSODWIRUPV
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