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2677.

Returns

2678.

1. Requesting method requests data,
gets Deferred object
2. Requesting method attaches callbacks
to Deferred object (.addCallbacks(..))

2679.

1. When the result is ready, give it
to the Deferred object (.callback(..)
or .errback(..))
2. Deferred object triggers (call/err)back with
the result or the Failure::
* if a callback raises exception, switch
to errback
* if an errback *doesn't* raise exception
or return a Failure, switch to callback
* result of callback is passed to next
callback, thus creating a chain of
processors
* an unhandled Failure gets passed down
the line of errbacks, thus creating
an analog to a series of 'except ...:'
blocks. Instead of except blocks, we
have errback methods.

2680.

Attaches

2681.

Requests Data From

2682.

1

2683.

2

2684.

3