@Override
    public Trace currentTrace() {
        return traceContext.currentRawTraceObject();
    }
intercept com.ning.http.client.AsyncHttpClient.executeRequest(Request,
AsyncHandler<T>)

@author netspider
@author jaehong.kim
agent-module/plugins/ning-asynchttpclient/src/main/java/com/navercorp/pinpoint/plugin/ning/asynchttpclient/interceptor/ExecuteRequestInterceptor.java