Download Central European Functional Programming School: Second by Rinus Plasmeijer, Peter Achten (auth.), Zoltán Horváth, PDF

By Rinus Plasmeijer, Peter Achten (auth.), Zoltán Horváth, Rinus Plasmeijer, Anna Soós, Viktória Zsók (eds.)

This quantity offers 8 conscientiously revised texts from chosen lectures given by means of major researchers on the moment significant ecu useful Programming institution, CEFP 2007, held in Cluj-Napoca, Romania, in June 2007.

The 8 revised complete papers offered have been rigorously chosen in the course of rounds of reviewing and development for inclusion within the booklet. The lectures hide quite a lot of subject matters similar to interactive workflows, lazy practical courses, lambda calculus, and object-oriented practical programming.

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Extra resources for Central European Functional Programming School: Second Summer School, CEFP 2007, Cluj-Napoca, Romania, June 23-30, 2007, Revised Selected Lectures

Example text

Future work will be the investigation of more “unusual” useful work flow patterns. Also we are working on a new option for the evaluation of tasks on the client side using Ajax technology in combination with an efficient interpreter for functional languages [15]. Acknowledgements The authors would like to thank Phil Wadler for his inspiring exercise, Erik Zuurbier for the many discussions on the state-of-art of contemporary work flow systems and as a source of many examples, and Wil van der Aalst for commenting on the difference between the combinator approach and contemporary work flow specification languages.

HSt → (Html,*HSt) | iCreate a /∗ Setting options for any collection of iTask workflows (<<@) : : set iData attribute globally for indicated (composition of) iTasks ∗/ class (<<@) infix 3 b :: (Task a) b → Task a :: GarbageCollect = Collect | NoCollect instance <<@ , , , defaultUser Lifespan StorageFormat Mode GarbageCollect :== 0 // // // // default: default: default: deafult: Session PlainString Edit Collect // default id of user // Here follow the iTask combinators: /∗ promote any iData editor to the iTask domain editTask : : create a task editor to edit a value of given type , and add a button with given name to finish the task ∗/ editTask :: String a → Task a | iData a /∗ standard monadic combinators on iTask (=>>) : : for sequencing: bind (> >) : : for sequencing: bind, but no argument : : l i f t a value to the iTask domain and return V ∗/ (=>>) infix 1 :: (Task a) (a → Task b) → Task b (> >) infixl 1 :: (Task a) (Task b) → Task b return_V :: a → Task a passed return i t | iCreateAndPrint b | iCreateAndPrint a 38 R.

In commercial systems, the connection between the specification of the work flow and the (type of the) concrete information being processed, is not always well typed. Our system is fully dynamic, depending on the values of the concrete information. For instance, recursive work flows can easily be defined. In a graphical system the flows are much more static. Our system is higher order: tasks can communicate tasks. Work can be interrupted and conditionally moved to other users for further completion.

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