Calling invokedynamic in Java

DynamicIndy There is no way to invoke invokedynamic using the Java language. So testing invokedynamic is not that obvious if you don#039;t have your own dynamic language. I#039;ve developed a small class DynamicIndy that uses ASM 4.0 (not an official release) to generate a static method that calls invokedynamic. These static method is after converted to a MethodHandle that can be called in Java The code is available at the bottom of this post How to use it ? DynamicIndy defines a method named (judiciously :) invokedynamic that takes a name and a MethodType, a way to specify a bootstrap method (a triple class, method name, method type ) and some optional arguments for the bootstrap method. The following code shows how to create a BigDecimal constant using invokedynamic. This code shows how to use it: public class DynamicIndyTest { public static CallSite bsm(Lookup lookup, String name, MethodType methodType, Object arg) { System.out.println(construct the BigDecimal constant +arg); return new ConstantCallSite( MethodHandles.constant(BigDecimal.class, new BigDecimal(arg.toString()))); } public static void main(String[] args) throws Throwable { DynamicIndy dynamicIndy = new DynamicIndy(); MethodHandle mh = dynamicIndy.invokeDynamic(_, MethodType.methodType(BigDecimal.class), DynamicIndyTest.class, bsm, MethodType.methodType(CallSite.class, Lookup.class, String.class, MethodType.class, O...

Date: January, 07 2011
Url: http://www.java.net/blog/forax/archive/2011/01/07/call-invokedynamic-java

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