關於非同步介面呼叫的疑問？

public DataBus callServcie(DataBus databus) {
	Future<DataBus> future=mThreadPool.submit(new AsyncThread(databus));
	if(future!=null){
		try {
			return future.get();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ExecutionException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	return null;
}
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class AsyncThread implements Callable<DataBus>{
        public DataBus call() throws Exception {
		//使用httpClient呼叫CRM介面
                ..............................................
	}
}
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