"Progress" - Integer percent completed indicator, which MUST return 100 only when the operation has been completed (either successfully or unsuccessfully).
“progress”：指示操作的进度，整型数值，当操作完成执行时，不论是成功还是失败，都返回100。
An asynchronous method can return a Future object that allows the client to retrieve a result value, check for exceptions, or attempt to cancel an in-progress invocation.
一个异步方法能返回一个Future对象，该对象使得客户端可以获得一个结果值、检查异常或者尝试取消正在进行中的调用。
An asynchronous method can return a Future object that allows the client to retrieve a result value, check for exceptions, or attempt to cancel an in-progress invocation.
一个异步方法能返回一个Future对象，该对象使得客户端可以获得一个结果值、检查异常或者尝试取消正在进行中的调用。
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