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e yu Y dS w 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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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.
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zResult is not ready.FN) r7 r9 r6 � _FINISHEDr �InvalidStateErrorr# r$ �_resultr5 r r r �result� s
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zFuture.exceptionr= c C sD | j tkr| jj|| |d� dS |du rt�� }| j�||f� dS )z�Add a callback to be run when the future becomes done.
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zFuture.add_done_callbackc s< � fdd�| j D �}t| j �t|� }|r || 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 tkrt�| j � d| ����|| _t| _ | �� dS )z�Mark the future done and set its result.
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)�futr0 r r r � _get_loop( s ��ra c C s | � � rdS | �|� dS )z?Helper setting the result only if the future was not cancelled.N)rA rR )r` rF r r r � _set_result_unless_cancelled4 s rb c C sT t | �}|tjju rtj| j� S |tjju r tj| j� S |tjju r(tj| j� S | S r( )r* �
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a Chain two futures so that when one completes, so does the other.
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