@Override
                    public void onResponse(Object result) {
                        logger.warn("Result received in callback: " + result);
                        rets.add((String) result);
                        latch.countDown();
                    }
test pre handle usage of UserProcessor

@author xiaomin.cxm
@version $Id: PrehandleTest.java, v 0.1 Jan 7, 2016 1:49:05 PM xiaomin.cxm Exp $
src/test/java/com/alipay/remoting/rpc/prehandle/PrehandleTest.java