Why Continuations Are Coming to Java

Post by saagarjha » Tue, Jul 02, 2019, 7:04 AM UTC

raverbashing wrote: post #19

AlEinstein wrote: post #13

Earlier quoted context omitted.

Speaking as a dev who started with Java 1.2, I actually much prefer to write code that doesn’t rely on magic unseen effects. The only exception to this is dependency injection via annotations but for god’s sake use it in moderation. But then I still prefer to write for loops rather than streams because I know what the jit compiler is doing.

Unless you're writing assembly or maybe C then "magic" is happening

Post by lupajz » Tue, Jul 02, 2019, 7:10 AM UTC

raverbashing wrote: post #18

cryptos wrote: post #17

What is called continuations in Java is available as "coroutines" in Kotlin, today. Both terms means more or less the same, from a programmers point of view, actually Continuations are part of Kotlins coroutines. https://kotlinlang.org/docs/reference/coroutines-overview.ht...

Is there some special jvm/dalvik support for it?

Post by groestl » Tue, Jul 02, 2019, 7:18 AM UTC

twic wrote: post #11

y4mi wrote: post #8

I find it amusing that whenever people talk about Java, they're somehow using magic to describe it. It's like Java programmers see themselves as magicians... This is especially widespread with spring boot. I've even read sentences like "It's hard to say what it does, you can only see it's effects!"

I wonder if it's because there is such a sharp line between what a Java programmer can do in Java, and what the JVM does to make that possible. Much of what the JVM does is impossible to even describe in normal Java. That line doesn't exist in, say, C++, where the compiler is just another C++ program. With the caveat that there are JVMs written in Java, so that line can be crossed: https://www.jikesrvm.org/ The same…

Post by twic » Tue, Jul 02, 2019, 7:20 AM UTC

Post by dmix » Tue, Jul 02, 2019, 7:27 AM UTC

bokchoi wrote: post #15

mcv wrote: post #4

Earlier quoted context omitted.

I vaguely seem to recall that Rhino, Cocoon's pre-Node serverside javascript, had continuations too. That much have been around 2006 or thereabouts.

I remember them too. I had to dig a little to find the links I remember from the past. http://web.archive.org/web/20190127111220/https://wiki.apach... From the Rhino Google group, it looks like some people are still using continuations in Rhino: https://groups.google.com/forum/#!topic/mozilla-rhino/Gfo-dO... https://github.com/szegedi/spring-web-jsflow