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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.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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�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)
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a Chain two futures so that when one completes, so does the other.
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