Coroutines for Java

[MatthiasM]

Hi,

I wrote a small (<10KB) library which adds Coroutines to Java

A article and the library itself can be found here

Ciao Matthias

[jezek2]

It's a very nice library, thanks for sharing. I've already integrated it into my engine for game code (and replaced JavaFlow that I used previously).

[brackeen]

Very interesting. So, I'm trying to grok it. What exactly does the preprocessing do? Can you show what happens to the TestIterator example?

Games published by our own members! Check 'em out!

[Riven]

Isn't this like software threading, with 'breakpoints' scattered through the bytecodes allowing you to suspend a method, do some other stuff and then continue where you left? Is it?

I'm not too fond of something manipulating my bytecodes, but I guess in AI it's very convenient - my state machines often turn into a steaming pile.

[MatthiasM]

Well

I could attach a javap dump of the example - which is long (at least too long for this forum) - but it's very easy to generate - after running the JUnit tests all class files have been instrumented.

The resulting code is similar to the "standard Java example" on the website - except that the state is not stored as member variables - to allow for recursive calls - but instead in a thread local instance of the Stack class which is managed by the Coroutine class.

The bytecode gets more complex if you have exception handling using finally in your methods - even to the point where it will be impossible to write it using Java itself (without duplicating a lot of code).

Riven: Look at the possibilities that bytecode instrumentation offers ....

Ciao Matthias