a `6@sdZdZddlZddlZddlZddlZddlmZddlm Z ddlm Z ddlm Z ej Z ej Z ejZejZejdZGd d d ZeZd d Zd dZddZddZddZddZddddZz ddlZWneyYn 0ejZZdS)z.A Future class similar to the one in PEP 3148.)Future wrap_futureisfutureN) base_futures)events) exceptions)format_helpersc@seZdZdZeZdZdZdZdZ dZ dZ dZ dZ ddddZejZddZd d Zd d Zed dZejddZddZddZd+ddZddZddZddZddZddZdd d!d"Z d#d$Z!d%d&Z"d'd(Z#d)d*Z$e$Z%dS),ra,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.) 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The callback is called with a single argument - the future object. If the future is already done when this is called, the callback is scheduled with call_soon. rAN)r;r<r rB contextvars copy_contextrappend)rfnr)rrradd_done_callbacks  zFuture.add_done_callbackcs<fdd|jD}t|jt|}|r8||jdd<|S)z}Remove all instances of a callback from the "call when done" list. Returns the number of callbacks removed. cs g|]\}}|kr||fqSrr).0frDrNrr sz/Future.remove_done_callback..N)rlen)rrNZfiltered_callbacksZ removed_countrrRrremove_done_callbacks zFuture.remove_done_callbackcCs8|jtkr t|jd|||_t|_|dS)zMark the future done and set its result. If the future is already done when this method is called, raises InvalidStateError. : N)r;r<rrHrIrGr>)rrJrrr set_results  zFuture.set_resultcCsb|jtkr t|jd|t|tr0|}t|turDtd||_t |_| d|_ dS)zMark the future done and set an exception. 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The other Future may be a concurrent.futures.Future. N)rFrEr@r"r[rmrJrW)rodestr"rJrrr_copy_future_stateVs   rrcststtjjstdts._set_statecs2|r.dusur"n jdSr+)rEr@call_soon_threadsafe) destination) dest_loopro source_looprr_call_check_cancels z)_chain_future.._call_check_cancelcsJrdurrdSdus,ur8|n|dSr+)rE is_closedru)ro)rtrwrvrxrr_call_set_states z&_chain_future.._call_set_state)rrXrirjrrZrgrO)rorvryr{r)rtrwrvrorxr _chain_futurejs   r|r cCsNt|r |St|tjjs(Jd||dur8t}|}t|||S)z&Wrap concurrent.futures.Future object.z+concurrent.futures.Future is expected, got N) rrXrirjrrr create_futurer|)r#r Z new_futurerrrrs r)r`__all__concurrent.futuresrirKloggingrrrrr rr<r=rGDEBUGZ STACK_DEBUGrZ _PyFuturergrhrmrprrr|r_asyncio ImportErrorZ_CFuturerrrrs<        *