Where can I find documentation on the JDK 7 changes to bytecodes and the backport project?
~~ Robert. John Rose wrote: > On May 6, 2009, at 8:26 AM, John Cowan wrote: > >> In my language, I need objects which represent Java static methods. > > That's what method handles are for; from a JDK 7 viewpoint you are > asking what is the best pre-JDK7 way to emulate method handles. > > Rémi Forax has a backport project which will reweave your JDK7 > bytecodes into a form suitable for pre-7 JVMs. > > That pre-7 form generated by the backport uses about the same > expedients you are currently using. The nice thing about that is it > can serve as a collection point for best practices. I think grouping > methods in a switch is the state of the art before JDK 7. > > Depending on your schema of call types, you'll want to choose between > grouping call types on interface types vs. one call type per interface > type. Interface types can be true Java interfaces, or Java abstract > classes with factored default error-reporting or adapting behaviors. > > Any of those choices is usually preferable to plain reflection, > because the semantics of reflective invocation is very complex, as it > includes: > - wrapped individual arguments and return values > - wrapped varargs list > - wrapped exceptions > - per-call access checks with associated exceptions > > Also, reflection does not support the semantics of invokespecial. And > there may be a footprint cost, as reflective objects are not mere > invocation capabilities (like method handles). They carry extra > baggage around to support symbol table queries such as annotations, > throws clauses, and Java generic signatures. > > I hope this helps. > -- John > > > > -- ~~ Robert Fischer. Grails Training http://GroovyMag.com/training Smokejumper Consulting http://SmokejumperIT.com Enfranchised Mind Blog http://EnfranchisedMind.com/blog Check out my book, "Grails Persistence with GORM and GSQL"! http://www.smokejumperit.com/redirect.html --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "JVM Languages" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/jvm-languages?hl=en -~----------~----~----~----~------~----~------~--~---
