@Override
                public void call() throws Exception {
                    scheduledFuture.cancel(true);
                    LOAD_EXECUTOR_SERVICE.shutdown();
                    start.set(false);
                }
@author Robert HG (254963746@qq.com) on 8/14/15.
lts-core/src/main/java/com/github/ltsopensource/queue/AbstractPreLoader.java