Objects ∩ Concurrency

Objects ∩ Concurrency

By Jonathan Worthington (‎jnthn‎) aus Prague.pm
Datum: Samstag Oktober 11, 2014 10:00
Dauer: 40 Minuten
Target audience: Jedes
Language: English
Tags: concurrency objects perl6

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A lot of the talk about concurrency in Perl 6 so far has focused on primarily functional constructs: promises, which represent a piece of computation that will produce a value at some point in the future, and supplies, which represent computations that asynchronously produce many values over time. These are both desirable models. The latter is especially powerful, since every mutable object you write can be re-designed in terms of a stream of immutable events.

While functional approaches emphasizing immutability are a very natural fit for concurrent situations, sometimes an OO approach will simply capture the problem a lot more elegantly than a stream of events can. The OO approach to concurrency is not to eliminate mutation, but rather to keep it within a boundary. Good OO design, with appropriate use of data-hiding and following principles such as "tell, don't ask", allow us to reason about state, and in turn employ a strategy that keeps it safe under concurrent operations.

In this session I'll quickly recap OO, data hiding, and the notions of thread safety and transactionality. I'll then look through some different ways OO and concurrency can be put together. Finally, I'll look at a design that brings the object and event worlds together.


Attended by: Elizabeth Mattijsen (‎liz‎), Wendy Van Dijk (‎woolfy‎), Nicholas Clark, Markus Förster, Thomas Heine, David Schmidt (‎davewood‎), Helmut Wollmersdorfer (‎wollmers‎), Johann Rolschewski (‎jorol‎), Markus Hechenberger (‎Hechi‎), Patrick Michaud (‎Pm‎), Tobias Leich (‎froggs‎), Philipp Gortan (‎mephinet‎), Peter Holzer (‎hjp‎), vende thiel, Sebastian Hofer, Ernst Lammer, Stefan Seifert (‎Nine‎), steve mynott (‎itz‎), Leon Timmermans (‎leont‎), Paul Cochrane (‎ptc‎), Wolfgang Schemmel (‎Perleone‎), Sue Spence (‎virtualsue‎),