Stephen Colebourne: Update on Closures in JDK 7
In Java Today, we highlight Stephen Colebourne's new blog post, More detail on Closures in JDK 7. In this informative post, Stephen talks about the announcement by Sun's Mark Reinhold at Devoxx last week (closures will be included in JDK 7) and "subsequent information that has become apparent."
Stephen speaks with authority on this topic, as he is co-author of one of the major Java closures proposals, "First=class methods: Java-style closures" (aka FCM). He notes that that the announcement "was a big surprise to everyone, and there was a bit of a vacuum as to what was announced." Still, the announcement showed that:
Sun, via Mark, have chosen to accept the basic case for including closures in Java. By doing so, the debate now changes from whether to go ahead, to how to proceed. This is an important step.
In Stephen's view, the big questions now relate to what's in and what's out. There have been multiple proposals on how closures could be implemented in Java, with differing proposed closure syntax. Assessing Mark's presentation and other information he's gathered since Mark's announcement, Stephen came up with a table that lists 13 fundamental characteristics of closures that have been specified in varying degrees of completeness in four major closure proposals:
- CICE - "Concise Instance Creation Expressions" by Bob Lee, Doug Lea, and Josh Bloch
- BGGA 0.5 - "Closures for the Java Programming Language" by Gilad Bracha, Neal Gafter, James Gosling, Peter von der Ahé
- FCM 0.5 - "First-class methods: Java-style closures" by Stephen Colebourne and Stefan Schulz
- CFJ 0.6a - "Closures for Java (v0.6a)" by Neal Gaffer
For each closure characteristic, Stephen shows which proposals indicate support for that aspect of closures. The final column of the table assesses whether support for each characteristic was suggested by Mark's announcement at Devoxx.
If you've been following the JDK 7 closures news, you'll want to read Stephen's More detail on Closures in JDK 7. It provides insight into the present course of events for closures in the upcoming JDK 7 (including what's known and what's still to be determined), while also pointing you to original documents that have been key in the ongoing debate and discussion regarding closures in Java.
I’m still alive although I’m not blogging much recently. It’s just because there’s so much happening in the NetBeans Universe. Thanks a lot to everyone voting for me as a member of the NetBeans Governance Board! If you happen to be in munich, visit me in my new office (Bergmannstr. 66) for the party in December (exact date has to be decided). Just came back from Devoxx on saturday where I had a great time hanging out with Geertjan, Aaron “This is” Houston, Sven Reimers, Florian Vogler and Martin Klähn. Geertjan and my session on Lookup and OSGi was nice (here’s a picture) and I met a lot of OSGi fans. It’s not so different from the NB Module system after all (but we were there first ). Also learned about Apache Ace. This is really cool technology...
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Stephen Colebourne provides More detail on Closures in JDK 7:
This blog goes into a little more detail about the closures announcement at Devoxx and subsequent information that has become apparent. At Devoxx 2009, Mark Reinhold from Sun announced that it was time for closures in Java. This was a big surprise to everyone, and there was a bit of a vacuum as to what was announced. Firstly, Sun, via Mark, have chosen to accept the basic case for including closures in Java. By doing so, the debate now changes from whether to go ahead, to how to proceed. This is an important step...
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mr_lightwonders about Streaming(posible complete push towards client): "What is to way to go / how to setup your service so that one avoids buffing the response/message as a whole? I'm looking for the same paradigm as is typically encountered with servlets:
public void accept(Request request, Response..."
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The new java.net Poll asks What do you think about closures in JDK 7? The poll will run through Thursday.
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