proxy.concrete
Proxy classes using standard java.lang.reflect.InvocationHandler
io.earcam.instrumental.proxy.concrete.Proxy:
- Uses CGLib to allow proxying of classes
- Uses Objenesis to circumvent constructor issues
- Accepts standard java.lang.reflect.InvocationHandler
A comprehensive (though not super-performant) proxy capable of proxying just about anything when couple with instrumental.agent.defy.
See also invocation handlers and proxying for interfaces in instrumental.proxy.
Dependency Graph
Examples
Proxy an abstract class
Number proxy = Proxy.createProxy(Number.class, new NoopInvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
{
return "doubleValue".equals(method.getName()) ? 42D : super.invoke(proxy, method, args);
}
});
assertThat(proxy.doubleValue(), is(42D));
Proxy an awkward class
A bit awkward:
public static class Foo {
public Foo()
{
throw new IllegalStateException();
}
public Foo(int unused)
{}
public String hello()
{
return "hello";
}
public String goodbye()
{
return "goodbye";
}
}
A simple partial handler:
public static class Handler extends PartialInvocationHandler<Foo> {
public Handler(Foo delegate)
{
super(delegate);
}
public String goodbye()
{
return "not " + delegate.goodbye() + ", but farewell";
}
}
Then invocation:
Foo proxy = Proxy.createProxy(Foo.class, new Handler(new Foo(42)));
assertThat(proxy.hello(), is(equalTo("hello")));
assertThat(proxy.goodbye(), is(equalTo("not goodbye, but farewell")));
