io.smallrye.faulttolerance.DefaultMethodFallbackProvider Maven / Gradle / Ivy
package io.smallrye.faulttolerance;
import java.lang.invoke.MethodHandles.Lookup;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
/**
* Workaround for default fallback methods (used e.g. in MP Rest Client).
*
* @author Martin Kouba
*/
class DefaultMethodFallbackProvider {
static Object getFallback(Method fallbackMethod, ExecutionContextWithInvocationContext ctx)
throws Throwable {
// This should work in Java 8
Class declaringClazz = fallbackMethod.getDeclaringClass();
Constructor constructor = Lookup.class.getDeclaredConstructor(Class.class);
constructor.setAccessible(true);
return constructor.newInstance(declaringClazz)
.in(declaringClazz)
.unreflectSpecial(fallbackMethod, declaringClazz)
.bindTo(ctx.getTarget())
.invokeWithArguments(ctx.getParameters());
}
private DefaultMethodFallbackProvider() {
}
}