@carlw I have not. I completely forgot about it.

I'll look into it, thanks 🙂

@Ruckus The threads created in the executor service are not daemon threads like @carlw said, so they will prevent the jvm from shutting down if any of them are created. You can pass in a custom

ThreadFactory

as the second parameter to

newFixedThreadPool

and call

thread.t.setDaemon(true)

on each thread after you create them, then it will shut down nicely even if there are threads in the pool when you shut down.

Hm... you do call shutdown, so it should have shut down no matter if the threads are daemon or not actually..

@Ruckus Call

super.stop()

after to call

pool.awaitTermination

and you're golden 🙂

@edvin That did it. I had a feeling it was something simple, but I couldn't think of it. Thanks!

@carlw @Ruckus I prefer the

while(true)

loop to keep an application alive.

I keed! I keed...

@Ruckus in all seriousness (without looking deeply into your problem) have you used

CountDownLatch

or other Semaphore-like synchronizers?

That's usually what I use if I want to wait on multiple processes to finish. I even use it when I cheat in RxJava.

I have. My purpose in this case is a pool that accepts rendering tasks. Tasks can be submitted at any time, and they are done in the background. I just want to make sure when the program is closed, any currently running renders are finished, then the JVM exits.

If anyone wants to see a Phaser -- the general form of the CountDownLatch -- this video shows an FX / Swing Threading integration

Pretty neat @carlw 🙂

@edvin yeah. i think the phaser might suit @Ruckus 's case if he doesn't want to work with a fixed pool.

@carlw That's pretty slick. It won't really work for what I'm doing right now, but it may simplify another part of my code where I am using a countdown latch.

@Ruckus hopefully it helps. i'd be interested in hearing more about the pipeline if you're able to share some of the design details

@Ruckus is this all in Kotlin / TornadoFX?

I'm working on software to do our family Christmas light show. I can't go into too many details at the moment since it's not currently open sourced (I'm the sole author for now and plan on opening it eventually, but my dad keeps trying to convince me to sell it instead, and since he is the primary "share-holder", his opinion does have weight).

It's currently barely a PoC so I'm not worried about it for now, but eventually I'll have to get this figured out 🙂

And yes, this is all Kotlin / TornadoFX (with a smattering of Java to get around some of kotlinc's generics bugs).

@Ruckus Cool project!

It's pretty fun 🙂

So cool 🙂 It would be nice to have a commercial TornadoFX based app out there as well though 🙂

@Ruckus I expect viral videos when it's all done.

Finished my O'Reilly video shoot today for Reactive Python for Data Science. Shooting a formally-produced video in small segments is more challenging than shooting it yourself in one go. After an afternoon of work and a number of retakes, I got a 3-hour video course ready. They're going to finalize editing in the next few weeks, and I'd definitely do it again.

I'm glad to be back in Java/Kotlin land right now. I can now redirect my focus on TornadoFX and RxJava stuff.

And my next book "Learning RxJava" by Packt has officially been signed. It's coming out in Fall 2017.

Hey folks, just want to drop a quick big Thank you. I have a little app to do and I'm having a blast!