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jrS rS r S r S r S r SS.S jr S r!S r"S r#S r$\$r%Sr&g)r a This class is *almost* compatible with concurrent.futures.Future.
Differences:
- This class is not thread-safe.
- result() and exception() do not take a timeout argument and
raise an exception when the future isn't done yet.
- Callbacks registered with add_done_callback() are always called
via the event loop's call_soon().
- This class is not compatible with the wait() and as_completed()
methods in the concurrent.futures package.
(In Python 3.4 or later we may be able to unify the implementations.)
NFloopc Uc [ R " 5 U l OXl / U l U R R 5 ( a0 [
R " [ R " S5 5 U l gg)zInitialize the future.
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r c ~ SU l U R [ :w a g[ U l Xl U R 5 g)zCancel the future and schedule callbacks.
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return True.
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_CANCELLEDr? _Future__schedule_callbacks)r msgs r cancel
Future.cancel s7 % ;;( " " !!#r c U R SS nU( d g/ U R SS& U H u p#U R R X US9 M! g)zInternal: Ask the event loop to call all callbacks.
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Nr0 )r r call_soon)r callbackscallbackctxs r __schedule_callbacksFuture.__schedule_callbacks sI OOA& &MH JJ = 'r c ( U R [ :H $ )z(Return True if the future was cancelled.)rD rF r" s r cancelledFuture.cancelled s {{j((r c ( U R [ :g $ )zReturn True if the future is done.
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future was cancelled.
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" S5 eSU l U R b% U R R U R 5 eU R $ )zReturn the result this future represents.
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zException is not set.F)rD rF rA rZ r
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" 5 nU R R X45 g)zAdd a callback to be run when the future becomes done.
The callback is called with a single argument - the future object. If
the future is already done when this is called, the callback is
scheduled with call_soon.
rL N)rD rE r rM contextvars copy_contextr append)r fnr0 s r add_done_callbackFuture.add_done_callback sN ;;( " JJ 7 ;%224 OO " "B= 1r c U R VVs/ s H u p#X!:w d M X#4PM nnn[ U R 5 [ U5 -
nU( a X@R SS& U$ s snnf )zmRemove all instances of a callback from the "call when done" list.
Returns the number of callbacks removed.
N)r len)r rg frP filtered_callbacks
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UR U l [ U l U R 5 SU l g)zMark the future done and set an exception.
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rr zPStopIteration interacts badly with generators and cannot be raised into a FutureTN)rD rE r
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--c R U R 5 ( a gU R U5 g)z?Helper setting the result only if the future was not cancelled.N)rT rs )r r_ s r _set_result_unless_cancelledr 6 s
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5 nU R " U5 g)z8Copy state from a future to a concurrent.futures.Future.N)rT rI set_running_or_notify_cancelr' r} r r_ rs )r sourcer' r_ s r _set_concurrent_future_stater G sr 2 2 4 4 "I !4Y!?@ f%r c UR 5 ( a gU R 5 ( a UR 5 gU R 5 nUb UR [ U5 5 gU R 5 nUR
U5 g)ziInternal helper to copy state from another Future.
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T5 OSmS mU U4S jnUUU4S jnTR U5 T R U5 g)a Chain two futures so that when one completes, so does the other.
The result (or exception) of source will be copied to destination.
If destination is cancelled, source gets cancelled too.
Compatible with both asyncio.Future and concurrent.futures.Future.
z(A future is required for source argumentz-A future is required for destination argumentNc R [ U 5 ( a [ X5 g [ X5 g r )r r r )r( others r
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_-r r c [ U 5 ( a U $ Uc [ R " 5 nUR 5 n[ X5 U$ )z&Wrap concurrent.futures.Future object.)r r r
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