CGLib Mixin Example

Question

Can someone give me a good example of using Java CGLib Mixin ? I dig none of them seems simple enough.

Answer 1

simple enough:

import static org.junit.Assert.*; import net.sf.cglib.proxy.Mixin; import org.junit.Before; import org.junit.Test; public class MixinTest { @Test public void test() { Mixin mixin = Mixin.create(new Object[]{ new Class1(), new Class2() }); assertEquals(1, ((Interface1)mixin).method1()); assertEquals(2, ((Interface2)mixin).method2()); } private interface Interface1 { public int method1(); } private interface Interface2 { public int method2(); } private static class Class1 implements Interface1 { @Override public int method1() { return 1; } } private static class Class2 implements Interface2 { @Override public int method2() { return 2; } } } 

Hope this helps.

Answer 2

The question is wider than just the mixin framework interface, so here is an example for a CGLIB mixin with two arbitrary classes:

 import java.lang.reflect.Method; import java.nio.charset.Charset; import java.util.Locale; import net.sf.cglib.proxy.Mixin; import net.sf.cglib.proxy.Mixin.Generator; public class CglibTest { public static void main(String[] args) throws Exception { Generator gen = new Generator(); gen.setStyle(Mixin.STYLE_EVERYTHING); gen.setDelegates(new Object[]{ Charset.defaultCharset(), Locale.getDefault()}); Mixin mixin = gen.create(); System.out.println(invokeMethod(mixin, "displayName")); System.out.println(invokeMethod(mixin, "getCountry")); } public static Object invokeMethod(Object target, String methodName) throws Exception { Method method = target.getClass().getMethod(methodName); return method.invoke(target); } } 

Answer 3

This example works with an enhanced enhancer and works like mixin: http://www.jroller.com/melix/entry/alternative_to_delegate_pattern_with