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A framework is defined within which reactive systems can be studied formally. The framework is based on s-categories, which are a new variety of categories within which reactive systems can be set up in such a way that labelled transition systems can be uniformly extracted. These lead in turn to behavioural preorders and equivalences, such as the failures(More)
Existing languages provide good support for typeful programming of standalone programs. In a distributed system, however, there may be interaction between multiple instances of many distinct programs, sharing some (but not necessarily all) of their module structure, and with some instances rebuilt with new versions of certain modules as time goes on. In(More)
We present a compiler for generating custom cryptographic protocols from high-level multiparty sessions. Sessions specify prearranged patterns of message exchanges between distributed participants and their data accesses to a shared store. We define integrity and confidentiality properties of sessions, in a setting where the network and arbitrary(More)
Type abstraction is a key feature of ML-like languages for writing large programs. Marshalling is necessary for writing distributed programs, exchanging values via network byte-streams or persistent stores. In this paper we combine the two, developing compile-time and run-time semantics for marshalling, that guarantee abstraction-safety between(More)
Distributed applications can be structured as parties that exchange messages according to some prearranged communication patterns. These sessions (or contracts , or protocols) simplify distributed programming: when coding a role for a given session, each party just has to follow the intended message flow, under the assumption that the other parties are also(More)
In most programming languages, type abstraction is guaranteed by syntactic scoping in a single program, but is not preserved by marshalling during distributed communication. A solution is to generate <i>hash types</i> at compile time that consist of a fingerprint of the source code implementing the data type. These hash types can be tupled with a marshalled(More)
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