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r� Y n X ej ZZ dS )z.A Future class similar to the one in PEP 3148.)�Future� wrap_future�isfuture� N� )� base_futures)�events)�
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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.)
NF��loopc C s@ |dkrt �� | _n|| _g | _| j�� r<t�t�d��| _ dS )z�Initialize the future.
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� RuntimeErrorr r r r �get_loopt s zFuture.get_loopc C s& d| _ | jtkrdS t| _| �� dS )z�Cancel the future and schedule callbacks.
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Future.cancelc C sH | j dd� }|sdS g | j dd�< |D ]\}}| jj|| |d� q(dS )z�Internal: Ask the event loop to call all callbacks.
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)r/ r0 r r r r �done� s z Future.donec C s@ | j tkrtj�| j tkr$t�d��d| _| jdk r:| j�| jS )a Return the result this future represents.
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Future.resultc C s0 | j tkrtj�| j tkr$t�d��d| _| jS )a& Return the exception that was set on this future.
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zFuture.exceptionr4 c C sB | j tkr | jj|| |d� n |dkr.t�� }| j�||f� dS )z�Add a callback to be run when the future becomes done.
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r5 � contextvarsZ copy_contextr �append)r �fnr& r r r �add_done_callback� s
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.
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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 )z�Mark the future done and set its result.
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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 �
concurrent�futuresr: 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 Z set_running_or_notify_cancelr! rO r` r> rJ )r\ �sourcer! r> r r r � _set_concurrent_future_state/ s rc c C sl | � � s t�|�� rdS |� � r$t�| �� r6|�� n2| �� }|dk rV|�t|�� n| �� }|�|� dS )zqInternal helper to copy state from another 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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