Distributed Services in a Messenger Environment

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Distributed Services in a Messenger Environment

DI MARZO SERUGENDO, Giovanna, et al. & CUI - Centre Universitaire d'Informatique, Université de Genève

Abstract

Mobile code is more and more accepted as a promising alternative for structuring distributed applications. The messenger paradigm is the approach to mobile code used in this paper.

Messengers are threads of control that can move in a network of messenger platforms to search for resources and information they need to accomplish their task. They are expressed in the MØ messenger language and are interpreted by messenger platforms. MØ is one such platform. We present in this paper an architecture for distributed services in a messenger environment, i.e., for services implemented with messengers and that are designed to run in a network of messenger platforms. The interaction between a service and its consummers (for example between a server and a client) requires that the interaction interface be known by the two parties before interaction can occur. The classical approach is to establish this interface at development time, making it quite impossible for a client to interact with a service for which it has not been prepared for. With the combined potential of mobile code and code interpretation, it is no longer necessary [...]

DI MARZO SERUGENDO, Giovanna, et al . & CUI - Centre Universitaire d'Informatique,

Université de Genève. Distributed Services in a Messenger Environment . Geneva : CUI - Centre Universitaire d'Informatique, Université de Genève, 1996, 39 p.

Available at:

http://archive-ouverte.unige.ch/unige:55422

Disclaimer: layout of this document may differ from the published version.

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k1

secretdef

secretdef k2 ~

version ~ "0.1"

fullname ~ "distributed semaphore"

down ~ procedure (x) up ~ procedure (x) P ~ procedure (x) V ~ procedure (x) createque ~ key ...

knowndict~ dict (r|w)

handle1 ~ pqueue ~ key

handle2 ~ pqueue ~ key global store of a platform

servdict (r|w|x)

knowndict

semadict (r|x) (service access point)

state ~ 0 state ~ 0 owner ~ ...

...

owner ~ ...

...

k2 ~ "distsema"

globdict (r|w) ...

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