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Emilio Tuosto, Roberto Zunino and myself  have developed a parametric calculus for contract-based computing in distributed systems. By abstracting from the actual contract language, our calculus generalises both the contracts-as-processes and contracts-as-formulae paradigms. The calculus features primitives for advertising contracts, for reaching agreements, and for querying the fulfilment of contracts. Coordination among participants happens via multi-party sessions, which are created once agreements are reached. We present two instances of our calculus, by modelling contracts as processes in a variant of CCS, and as formulae in a logic. We formally relate the two paradigms, through an encoding from contracts-as-formulae to contracts-as-processes [...]

My RAS Project TRICS: A Trusted Reservation Infrastructure for Computational Societies has been funded (grant L.R.7/2007 CRP-17285). The goal of this project is to model and develop a trustworthy reservation infrastructure. We are looking for a generic infrastructure, which can be specialized to a wide variety of contexts of reservations: flights, hotels, museums, car pooling, medical examinations, etc. A key aspect of the project is that the interaction between clients and services should be guided by contracts, which allow clients and services to agree on the required and offered features. Contracts might have, for example, sanctions for the modification or [...]

The current version of kSOAP2, the Android library for communication via SOAP, does not offer facilities for serializing and deserializing complex objects. Furthermore, arrays are not supported. In this post, we will introduce a patch of kSOAP2 which enables Android clients to communicate complex objects and arrays via SOAP. We will do that with the help of an example. Here you can find: * the jar of our patch * the sources of the patched files * the sources of the example (both client and server) * the sources of the official version of kSOAP2.

Roberto Zunino and myself have recently investigated the logical foundations of contracts in concurrent systems.  A contract is an agreement stipulated between two or more parties, which specifies the duties and the rights of the parties involved therein. We have modelled contracts as formulae in an intuitionistic logic extended with a “contractual” form of implication.  We have proved decidability of our logic via cut elimination: this allows us to mechanically infer the rights and the duties deriving from any set of contracts. We have embedded our logic in a core calculus of contracting processes, which combines features from concurrent constraints [...]