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1. André E. Veltstra (aeveltstra@mastodon.social)'s status on Monday, 11-Feb-2019 22:48:07 UTC André E. Veltstra

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   I like #eventDriven #software #architecture ever since I encountered it both in #JavaScript and in #VisualBasic. When I switched to the #Java #programming #language, it happened when Java still had to gain #lambdas. Applying an event-driven paradigm with that version of Java felt out of place and unelegant. But ever since #Java8 I find myself slowly returning to event-driven choices.

   • André E. Veltstra (aeveltstra@mastodon.social)'s status on Monday, 11-Feb-2019 22:53:46 UTC André E. Veltstra

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     For instance, after a HttpResponse is returned from a web server, I check the status code: if failure, then run failure method, else run success method. I can do that with an if statement. Using an if statement means that I have to query the status code. I can also do it with a Consumer and Runnable: onSuccess(action, otherwise). The status code still gets checked, but now that gets done in the appropriate place: the response checks it, or the code checks itself.

   • André E. Veltstra (aeveltstra@mastodon.social)'s status on Monday, 11-Feb-2019 22:58:25 UTC André E. Veltstra

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     We see hints to this model in #Java's #Optional class, with its #ifPresent(Consumer) method, and its #ifPresentOrElse(Consumer, Runnable) method.
     
     And it's a shame that we can't apply this model to Strings or anything else implementing an isEmpty() method: the Java #programming #language won't let us #subclass most of its core classes.
     
     It feels easier to implement this in a #trait-based language like #RustLang.

   • André E. Veltstra (aeveltstra@mastodon.social)'s status on Monday, 11-Feb-2019 23:04:20 UTC André E. Veltstra

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     The #Java #programming #language of course has a long history with passing #Runnables into #thread runners and executors. We see it all over the place in #Swing and #JavaFX. It just always felt clunky to me. And that feeling got lifted, mostly, with Java gaining #lambdas.
     
     I remember when my #CSharp colleagues first introduced me to the concept of lambdas. We were very excited.
     
     May the remaining limitations Java imposes on lambdas get lifted soon!