Migration = Cloning ; Aliasing (Preliminary Version)

Hans Hüttel
Josva Kleist
Uwe Nestmann
Massimo Merro

December 1998

Abstract:

In Obliq, a lexically scoped, distributed, object-based programming language, object migration was suggested as creating a (remote) copy of an object's state at the target site, followed by turning the (local) object itself into an alias, also called surrogate, for the just created remote copy.

We consider the creation of object surrogates as an abstraction of the above-mentioned style of migration. We introduce Ųjeblik, a distribution-free subset of Obliq, and provide two formal semantics, one in an intuitive configuration style, the other in terms of a pi-calculus. The intuitive semantics shows why surrogation is neither safe in Obliq, nor can it be so in full generality in Repliq (a repaired Obliq). The pi-calculus semantics allows us to prove that surrogation in Ųjeblik is safe for certain well-identified cases, thus suggesting that migration in Repliq may be safe, accordingly

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