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  Coroutines for Java  (Read 8213 times)
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Offline MatthiasM

Junior Newbie

« Posted 2008-04-10 22:18:20 »


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

A article and the library itself can be found here

Ciao Matthias
Offline jezek2
« Reply #1 - Posted 2008-04-11 09:55:54 »

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

Junior Devvie

« Reply #2 - Posted 2008-04-11 17:52:53 »

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

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« Reply #3 - Posted 2008-04-11 18:30:44 »

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? Grin

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.

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Offline MatthiasM

Junior Newbie

« Reply #4 - Posted 2008-04-11 23:46:15 »

Well Smiley

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
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