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� Zdd� Zdd� Zdd� Zdd� Zdd� Zdd�dd�Z z ddl Z W n e y� Y n 0 e j ZZ dS )z.A Future class similar to the one in PEP 3148.)�Future� wrap_future�isfuture� N)� GenericAlias� )� 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@ |du rt �� | _n|| _g | _| j�� r<t�t�d��| _ dS )z�Initialize the future.
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z Future._make_cancelled_errorc C s, d| _ | jtkrdS t| _|| _| �� dS )z�Cancel the future and schedule callbacks.
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| j tkS )z(Return True if the future was cancelled.)r6 r8 r r r r � cancelled� s zFuture.cancelledc C s
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zFuture.exceptionr< c C sB | j tkr | jj|| |d� n |du r.t�� }| j�||f� dS )z�Add 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.
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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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rc c C s | � � r dS | �|� dS )z?Helper setting the result only if the future was not cancelled.N)r@ rQ )rb rE r r r � _set_result_unless_cancelled4 s rd c C sX t | �}|tjju r tj| j� S |tjju r8tj| j� S |tjju rPtj| j� S | S d S r) )rS �
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a Chain two futures so that when one completes, so does the other.
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