Why Continuations Are Coming to Java

rzzzt wrote: post #2

Apache Commons Javaflow is an early implementation of continuations: https://commons.apache.org/sandbox/commons-javaflow/tutorial...

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

Re: Why Continuations Are Coming to Java

#5

Post by scanr » Tue, Jul 02, 2019, 6:19 AM UTC

mcv wrote: post #4

rzzzt wrote: post #2

Apache Commons Javaflow is an early implementation of continuations: https://commons.apache.org/sandbox/commons-javaflow/tutorial...

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

They were great. You could serialise them, store them in a database and then deserialise them some time later and keep going. Cheap workflow engine.

Re: Why Continuations Are Coming to Java

#6

Post by Blackthorn » Tue, Jul 02, 2019, 6:24 AM UTC

darkpuma wrote: post #3

What impact, if any, would this have on Clojure?

It would basically be a better and much more seamless Pulsar which is awesome.

Re: Why Continuations Are Coming to Java

#7

Post by kristianp » Tue, Jul 02, 2019, 6:27 AM UTC

The Project Loom webpage: https://wiki.openjdk.java.net/display/loom/Main

Re: Why Continuations Are Coming to Java

#8

Post by y4mi » Tue, Jul 02, 2019, 6:28 AM UTC

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!"

Re: Why Continuations Are Coming to Java

#9

Post by provolone » Tue, Jul 02, 2019, 6:30 AM UTC

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!"

Just avoid bloated frameworks and your problem is solved.

Re: Why Continuations Are Coming to Java

#10

Post by stingraycharles » Tue, Jul 02, 2019, 6:36 AM UTC

mcv wrote: post #4

rzzzt wrote: post #2

Apache Commons Javaflow is an early implementation of continuations: https://commons.apache.org/sandbox/commons-javaflow/tutorial...

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

Continuations are a very old concept, and you'll be finding many programming languages have support before that. For example, Scheme had continuations (call/cc) since 1975, and I'm sure there must have been implementations before that.