Deferred总结

Deferred总结：

A Deferred is like a Future with a dynamic Callback chain associated to it.
When the deferred result becomes available, the callback chain gets triggered.
The result of one callback in the chain is passed on to the next.
When a callback returns another Deferred, the next callback in the chain doesn't get executed until that other Deferred result becomes available.
There are actually two callback chains. One is for normal processing, the other is for error handling / recovery. A Callback that handles errors is called an "errback".
Deferred is an important building block for writing easy-to-use asynchronous APIs in a thread-safe fashion.

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