ThreadPoolExecutor

English & Dutch

This workshop is mostly in Dutch and partly in English; as it is based on an existing Dutch documentation. Only the new parts are in English. Hopefully, more and more part will be translated.

Deze workshop is gebaseerd op bestaande, Nederlandse teksten. Voorlopig zijn alleen de nieuwe delen in het Engels.

• You can use google-translate for now: Translate (STAGING branch).

practice-time:

2 * 1 hour

This workshop is about the ThreadPoolExecutor (‘TPE’ for friends): a pool of workers implemented with Threads. This is a modern, advanced design-pattern available in many languages.

You will get an introduction to the concepts, to be able to use the ‘TPE’. Also, we study Python implementation, to practice design-analyse.

The example code is both available in Python and Java; more languages will follow. As the python-TPE is open-source and easy to read, that one is used for the design-analyse. In that exercise, you will analyse code to create some design-diagrams afterward.

Last, you may use this concept in a next DesignWorkShop …

As usual, this workshop has some sections named Questionnaire; those questions are meant to sharpen the mind. Thinking about the answer is more important that the answer itself.
Some exercises will have a possible elaboration; often that isn’t only good one. Again: think about it. And learn!

—Have fun, Albert

• Introduction
  • Why concurrently?
  • Concept
  • The TPE API
  • Use (Examples)
  • Exercise
• Design Analyse
  • Static Analyse
  • Dynamic Analyse
• Elaboration
  • Pyreversed class diagrams
  • DesignBoard

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See also

ThreadPoolExecutor (python)

De referentie voor deze opdracht. https://docs.python.org/3/library/concurrent.futures.html#threadpoolexecutor

Future-Objects (python)

Meer over (python) future-objects is te vinden op: https://docs.python.org/3/library/concurrent.futures.html#future-objects

ProcessPoolExecutor (python)

De proces variant heeft (vrijwel) dezelfde interface (en gezamelijke code). Voor liefhebbers is de documentatie te vinden op: https://docs.python.org/3/library/concurrent.futures.html#processpoolexecutor

Java

• Ook Java heeft een ThreadPoolExecutor; zie: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ThreadPoolExecutor.html

• En kent kent het Future-object, (o.a.) als interface. Zie: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html

C#

• In C# bestaan wel Thread-Pools: https://docs.microsoft.com/en-gb/dotnet/articles/csharp/programming-guide/concepts/threading/thread-pooling

• Maar lijken Future-object niet te bestaan. Zie in bovenstaande de opmerkingen over .. and return values

C++

• Er lijkt weinig ondersteuning in C++ voor worker-pools en futures.

• Boost (http://www.boost.org) levert wel een aantal oplossingen (als library-code). Onderstaande links verwijzen naar de documentatie daarvan.

  • basic_thread_pool

  • futures

Blocks in C

Met deze C-extensie zijn functie inlines te definiëren. Het zijn een soort van lambda-expressies, die gebruikt worden als argument in GCD.dispatch() functies. O.a de CLang ondersteund dit.

Zie https://en.wikipedia.org/wiki/Blocks_(C_language_extension)

Hint

This extension does need a runtime (library) too.

Requirements Traceability   Pub/Sub

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