lambda-metafactory | 易学教程

Create BiConsumer from LambdaMetafactory

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问题 I'm trying to dynamically create a method reference of type BiConsumer through LambdaMetafactory. I was trying to apply two approaches found on https://www.cuba-platform.com/blog/think-twice-before-using-reflection/ - createVoidHandlerLambda and here Create BiConsumer as Field setter without reflection the Holger's answer. However in both cases I'm having below error: Exception in thread "main" java.lang.AbstractMethodError: Receiver class org.home.ref.App$$Lambda$15/0x0000000800066040 does

LambdaMetafactory to access class on a different ClassLoader

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问题 I have this code which works fine: Method getterMethod = Person.class.getDeclaredMethod("getName"); MethodHandles.Lookup lookup = MethodHandles.publicLookup(); Class<?> declaringClass = getterMethod.getDeclaringClass(); Class<?> returnType = getterMethod.getReturnType(); CallSite getterSite = LambdaMetafactory.metafactory(lookup, "apply", MethodType.methodType(Function.class), MethodType.methodType(Object.class, Object.class), lookup.findVirtual(declaringClass, getterMethod.getName(),

Use LambdaMetafactory to invoke one-arg method on class instance obtained from other classloader

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问题 Based on this stackoverflow answer, I am attempting to instantiate a class using reflection and then invoke a one-argument method on it using LambdaMetafactory::metafactory (I tried using reflection, but it was rather slow). More concretely, I want to create an instance of com.google.googlejavaformat.java.Formatter , and invoke its formatSource() method with the following signature: String formatSource(String input) throws FormatterException . I have defined the following functional interface

Java LambdaMetaFactory Method call with multiple vargs to avoid Reflection

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问题 I am currently using Java reflection I don't have any problem doing it with reflection . I learned about LambdaMetaFactory has better performance than reflection .. There is examples about getter and setter .. but there is no example for multiple parameterized method like doSomethig(String a, String b, int c) ; here is what i am doing on reflection @Override public T invokeReturn(final Object instance, final Object... args) throws Exception { try { final Method mtd = this.getMethod(); mtd

How to instantiate an object using LambdaMetaFactory?

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问题 I have an interface Action: package action; public interface Action { public String act(); } Class SimpleAction: package action; public class SimpleAction implements Action { String action; public SimpleAction() {} public SimpleAction(String x) { this.action = x; } @Override public String act() { return "Act method from -" + this.action; } } Class ComplexAction: package action; public class ComplexAction implements Action{ String action; public ComplexAction() {} public ComplexAction(String x

Use LambdaMetafactory to invoke one-arg method on class instance obtained from other classloader

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Based on this stackoverflow answer , I am attempting to instantiate a class using reflection and then invoke a one-argument method on it using LambdaMetafactory::metafactory (I tried using reflection, but it was rather slow). More concretely, I want to create an instance of com.google.googlejavaformat.java.Formatter , and invoke its formatSource() method with the following signature: String formatSource(String input) throws FormatterException . I have defined the following functional interface: @FunctionalInterface public interface FormatInvoker { String invoke(String text) throws