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r Y n X ej ZZ dS )z.A Future class similar to the one in PEP 3148.)Future wrap_futureisfuture N ) base_futures)events)
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d Zdd Zdd Zdd Zdd Zdd Zdd Zdd Zdd d d Z d d Z d!d" Z d#d$ Z d%d& Z e Z!dS )'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 C s@ |dkrt | _n|| _g | _| j r<ttd| _ dS )zInitialize the future.
The optional event_loop argument allows explicitly setting the event
loop object used by the future. If it's not provided, the future uses
the default event loop.
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d S | j}| jj d|| d}| jr6| j|d< | j| d S )Nz exception was never retrieved)message exceptionfutureZsource_traceback)_Future__log_traceback
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zFuture.__del__c C s | j S N)r# r r r r _log_tracebackj s zFuture._log_tracebackc C s t |rtdd| _d S )Nz'_log_traceback can only be set to FalseF)bool
ValueErrorr# )r valr r r r) n s c C s | j }|dkrtd|S )z-Return the event loop the Future is bound to.Nz!Future object is not initialized.)r
RuntimeErrorr r r r get_loopt s zFuture.get_loopc C s& d| _ | jtkrdS t| _| dS )zCancel the future and schedule callbacks.
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Future.cancelc C sH | j dd }|sdS g | j dd< |D ]\}}| jj|| |d q(dS )zInternal: Ask the event loop to call all callbacks.
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| j tkS )z(Return True if the future was cancelled.)r/ r1 r r r r cancelled s zFuture.cancelledc C s
| j tkS )zReturn True if the future is done.
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)r/ r0 r r r r done s z Future.donec C s@ | j tkrtj| j tkr$tdd| _| jdk r:| j| jS )a Return the result this future represents.
If the future has been cancelled, raises CancelledError. If the
future's result isn't yet available, raises InvalidStateError. If
the future is done and has an exception set, this exception is raised.
zResult is not ready.FN) r/ r1 r CancelledError _FINISHEDInvalidStateErrorr# r$ _resultr r r r result s
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Future.resultc C s0 | j tkrtj| j tkr$tdd| _| jS )a& Return the exception that was set on this future.
The exception (or None if no exception was set) is returned only if
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CancelledError. If the future isn't done yet, raises
InvalidStateError.
zException is not set.F)r/ r1 r r: r; r< r# r$ r r r r r! s
zFuture.exceptionr4 c C sB | j tkr | jj|| |d n |dkr.t }| j||f dS )zAdd a callback to be run when the future becomes done.
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scheduled with call_soon.
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zFuture.add_done_callbackc s< fdd| j D }t| j t| }|r8|| j dd< |S )z}Remove all instances of a callback from the "call when done" list.
Returns the number of callbacks removed.
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<listcomp> s z/Future.remove_done_callback.<locals>.<listcomp>N)r len)r rA Zfiltered_callbacksZ
removed_countr rE r remove_done_callback s
zFuture.remove_done_callbackc C s8 | j tkr t| j d| || _t| _ | dS )zMark the future done and set its result.
If the future is already done when this method is called, raises
InvalidStateError.
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set_result s
zFuture.set_resultc C sb | j tkr t| j d| t|tr0| }t|tkrDtd|| _t | _ |
d| _ dS )zMark the future done and set an exception.
If the future is already done when this method is called, raises
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rI zPStopIteration interacts badly with generators and cannot be raised into a FutureTN) r/ r0 r r<
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rZ c C s | r dS | | dS )z?Helper setting the result only if the future was not cancelled.N)r8 rJ )rY r> r r r _set_result_unless_cancelled s r[ c C sX t | }|tjjkr tj| j S |tjjkr8tj| j S |tjjkrPtj| j S | S d S r( )rL
concurrentfuturesr: r args TimeoutErrorr< )r% Z exc_classr r r _convert_future_exc# s r` c C s^ | s t| r | | s(dS | }|dk rH| t| n| }| | dS )z8Copy state from a future to a concurrent.futures.Future.N)
r9 AssertionErrorr8 r3 set_running_or_notify_cancelr! rO r` r> rJ )r\ sourcer! r> r r r _set_concurrent_future_state/ s rd c C sl | s t| rdS | r$t| r6| n2| }|dk rV|t| n| }|| dS )zqInternal helper to copy state from another Future.
The other Future may be a concurrent.futures.Future.
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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.
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r ) rT __all__concurrent.futuresr\ r? loggingr r r r r r r0 r1 r; DEBUGZ STACK_DEBUGr Z _PyFuturerZ r[ r` rd rf ro r Z_asyncio ImportErrorZ_CFuturer r r r <module> s:
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