Our project require programmatically specific logic and i wanted will write it via Byte-Buddy. So, me need know, how class can be transformed many times with save changes between iterations?
P.S. Multiple transforms me need because only in runtime can be possible know all specific-criterias and depending on it will be need some of transformations
Psedo-code:
public class Adapter {
public void methodM1() {
System.out.println("simple method m1 test");
}
public void methodM2() {
System.out.println("simple method m2 test");
}
}
public class InterceptorM1 {
@RuntimeType
public static Object intercept(@AllArguments Object[] allArguments) {
System.out.println("method from swapping m1");
return null;
}
}
public class InterceptorM2 {
@RuntimeType
public static Object intercept(@AllArguments Object[] allArguments) {
System.out.println("method from swapping m2");
return null;
}
}
public void example() throws NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
Class<?> clazz = Adapter.class;
new ByteBuddy()
.subclass(Adapter.class)
.method(named("methodM1"))
.intercept(MethodDelegation.to(InterceptorM1.class))
.make()
.load(getClass().getClassLoader(), ClassLoadingStrategy.Default.WRAPPER)
.getLoaded();
Class<?> dynamicType = new ByteBuddy()
.subclass(Adapter.class)
.method(named("methodM2"))
.intercept(MethodDelegation.to(InterceptorM2.class))
.make()
.load(getClass().getClassLoader(), ClassLoadingStrategy.Default.WRAPPER)
.getLoaded();
Adapter adapter = (Adapter) dynamicType.getDeclaredConstructor().newInstance();
adapter.methodM1();
adapter.methodM2();
}
Current result in console:
simple method m1 test
method from swapping m2
What i want get:
method from swapping m1
method from swapping m2
I found this examples, but I don’t have a complete understanding: