Implementation of Programming Languages. Guido Salvaneschi Jurgen Van Ham

Transcription

1 Implementation of Programming Languages Guido Salvaneschi Jurgen Van Ham

2 Outline Administrivia Intro Schedule Topics

3 GENERAL INFORMATION

4 Administrivia Guido Salvaneschi, Jurgen van Ham Find us by Office A213 / A207 Group of Prof. Mira Mezini (STG)

5 Intro Implement a software artifact according to a given specification. General scope: programming languages: Extensions, code generators Tools, IDEs Analysis techniques Performance assessments Prototypes with innovative abstractions

6 Timeline Periodic discussions/meetings. Presentation and delivery of the artifact and the documentation: end of the semester.

7 Guidelines and Suggestions Depending on the goal of the project In general: Deliver RUNNING code Deliver some documentation Optional: final presentation / demo to discuss your work Teamworking is good! Organize a team even with people you don t know (yet)

8 Grades Depending on the project Some guidelines: How much of the specification was implemented? Is the code working (the answer is YESOFCOURSE) What is the overall quality of the code? E.g. is it painful to modify/extend it? Is it self-documenting? What is the quality of the documentation?

9 Where to start Send me an with your name and a list of 3 topics in order of preference. Or arrange an appointment: Ask clarifications if needed Discuss possible customizations Discuss the projects in more detail Consider your programming skills Topics will be assigned Discuss the project in detail with the instructor

10 Getting Widespread Reactive programming in JavaScript Flapjax, Bacon.js, Reactive.js, React.js, Microsoft reactive extensions (Rx) REScala Principles of Reactive Programming Martin Odersky, Erik Meijer and Roland Kuhn

11 RP in a Nutshell Reactivity in OO apps: Observer pattern In RP you can define constraints The framework enforces them for you Changes are automatically propagated VIEW X Y Z val a = 3 d val b = 7 val c := a + b val d := 2 * c c a=4 println(c) // c==11 a b DATA X Y Z

12 TOPICS

13 Collection of examples for RP Create a suite of examples that cover the basics of reactive programming (Small!) Simulations Graphical interfaces Enter a 3 character string: <input id="textfield1" style={! {bordercolor: (extractvalueb('textfield1').length === 3? 'green' : 'red')}!}/>

14 Scala Interface for Distributed RP DREAM: Distributed REActive PrograMming Remote<Int> a = new Remote( a + b ) DREAM val a = Signal{ a() + b() } RESCALA Provide a Scala reactive interface for DREAM! Analysis of Signal expressions Binding with remote objects

15 Case study for Join Languages Joins make concurrency easier! Wait for the second event Several proposals Polyphonic C# (Microsoft) Scala Joins JoCaml Evaluate this solution with a case study

16 Case study on efficient reactive programming Example from Simulink/Labview Implement the example using RP Compare performance and expressivity

17 RP in Java - DREAM Java 8 (finally!) has lambdas select sum(salary) from people where gender = 'FEMALE' Stream<Student> map = persons.stream().filter(p -> p.getage() > 18).map(person -> new Student(person)); SQL JAVA 8 people. stream(). filter(p -> p.getgender() == Person.Gender.FEMALE). maptoint(p -> p.getsalary()). sum(); Extend Java to support signals and RP Polyglot/JustAdd extensible compilers Functional flavor + reactivity

18 Twitter Client Develop a simple twitter client with reactive programming Simple GUI Reactive abstractions XML parsing Network communication User interaction Evaluate the use of reactive abstractions in the project Just an example, other case studies are possible

19 Session types in Scala Session types support static check of protocols correctness Steps Study session types Reuse existing library Small case study

20 Reactive Programming and OO Languages Reactive programming has been developed in the functional programming community How reactive abstractions, e.g. signals, behaviors,, interact with OO features? Develop a set of small examples/studies that investigate reactive programming in the OO domain Encapsulation Inheritance Information hiding..

21 QUESTIONS?