Hi all,
I'm trying to find a solution to implement the native interface
default method for Groovy 3 and encounter the following problems. Any advice
is appreciated!
1) [Generating Fields]
No matter whether STC is enabled or not, the following fields need to be
generated, but `private`, `transient ` are invalid modifier for field in
interface declaration. In addition, field `metaClass` is not `static` so
`metaClass` can not be generated in interface either...
private static org.codehaus.groovy.reflection.ClassInfo $staticClassInfo
public static transient boolean __$stMC
private transient groovy.lang.MetaClass metaClass
2) [Generating Methods]
`protected` can not be used to define interface method.
protected synthetic $getStaticMetaClass()Lgroovy/lang/MetaClass;
public getMetaClass()Lgroovy/lang/MetaClass;
public setMetaClass(Lgroovy/lang/MetaClass;)V
public invokeMethod(Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;
public getProperty(Ljava/lang/String;)Ljava/lang/Object;
public setProperty(Ljava/lang/String;Ljava/lang/Object;)V
// when STC is disabled, the following additional methods will be generated
private static synthetic $createCallSiteArray_1([Ljava/lang/String;)V
private static synthetic
$createCallSiteArray()Lorg/codehaus/groovy/runtime/callsite/CallSiteArray;
private static synthetic
$getCallSiteArray()[Lorg/codehaus/groovy/runtime/callsite/CallSite;
As for all of the above `public` instance methods, we can transform
them to `default` instance methods.
At last, I have a crazy idea, maybe we can generate all of the above
fields and methods with traits, but the default method is generated in a
native way, e.g.
```
// native interface
interface SomeInterfaceWithDefaultMethod {
// native interface default method
default void helloWorld() {
// generate bytecode here to use traits to invoke MOP
methods
}
}
```
Cheers,
Daniel.Sun
-----
Apache Groovy committer
Blog: http://blog.sunlan.me
Twitter: @daniel_sun
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