Scalas, AAScalasYoshida, NNYoshida2016-10-192016-07-172016-10-192016-07-17Leibniz International Proceedings in Informatics, LIPIcs, 2016, 56, pp.21:1-21:2897839597701491868-8969http://hdl.handle.net/10044/1/41760Designing, developing and maintaining concurrent applications is an error-prone and time-consuming task; most difficulties arise because compilers are usually unable to check whether the inputs/outputs performed by a program at runtime will adhere to a given protocol specification. To address this problem, we propose lightweight session programming in Scala: we leverage the native features of the Scala type system and standard library, to introduce (1) a representation of session types as Scala types, and (2) a library, called lchannels, with a convenient API for session-based programming, supporting local and distributed communication. We generalise the idea of Continuation-Passing Style Protocols (CPSPs), studying their formal relationship with session types. We illustrate how session programming can be carried over in Scala: how to formalise a communication protocol, and represent it using Scala classes and lchannels, letting the compiler help spotting protocol violations. We attest the practicality of our approach with a complex use case, and evaluate the performance of lchannels with a series of benchmarks.Licensed under Creative Commons License CC-BYConference Paperhttps://www.dx.doi.org/10.4230/LIPIcs.ECOOP.2016.21ERI 025567 (EP/K034413/1)PO 1553380EP/K011715/1612985