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Edit File: impl.pyc
� 1��fc @ sL d Z d d l Z d d l Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d d l m Z d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d S( s Pool implementation classes. i����Ni ( t _AsyncConnDialect( t _ConnectionFairy( t _ConnectionRecord( t Pooli ( t exc( t util( t chop_traceback( t queue( t threadingt QueuePoolc B s� e Z d Z e Z e j Z d d d e d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s� A :class:`_pool.Pool` that imposes a limit on the number of open connections. :class:`.QueuePool` is the default pooling implementation used for all :class:`_engine.Engine` objects, unless the SQLite dialect is in use. i i g >@c K s] t j | | | � | j | d | �| _ d | | _ | | _ | | _ t j � | _ d S( s� Construct a QueuePool. :param creator: a callable function that returns a DB-API connection object, same as that of :paramref:`_pool.Pool.creator`. :param pool_size: The size of the pool to be maintained, defaults to 5. This is the largest number of connections that will be kept persistently in the pool. Note that the pool begins with no connections; once this number of connections is requested, that number of connections will remain. ``pool_size`` can be set to 0 to indicate no size limit; to disable pooling, use a :class:`~sqlalchemy.pool.NullPool` instead. :param max_overflow: The maximum overflow size of the pool. When the number of checked-out connections reaches the size set in pool_size, additional connections will be returned up to this limit. When those additional connections are returned to the pool, they are disconnected and discarded. It follows then that the total number of simultaneous connections the pool will allow is pool_size + `max_overflow`, and the total number of "sleeping" connections the pool will allow is pool_size. `max_overflow` can be set to -1 to indicate no overflow limit; no limit will be placed on the total number of concurrent connections. Defaults to 10. :param timeout: The number of seconds to wait before giving up on returning a connection. Defaults to 30.0. This can be a float but is subject to the limitations of Python time functions which may not be reliable in the tens of milliseconds. :param use_lifo: use LIFO (last-in-first-out) when retrieving connections instead of FIFO (first-in-first-out). Using LIFO, a server-side timeout scheme can reduce the number of connections used during non-peak periods of use. When planning for server-side timeouts, ensure that a recycle or pre-ping strategy is in use to gracefully handle stale connections. .. versionadded:: 1.3 .. seealso:: :ref:`pool_use_lifo` :ref:`pool_disconnects` :param \**kw: Other keyword arguments including :paramref:`_pool.Pool.recycle`, :paramref:`_pool.Pool.echo`, :paramref:`_pool.Pool.reset_on_return` and others are passed to the :class:`_pool.Pool` constructor. t use_lifoi N( R t __init__t _queue_classt _poolt _overflowt _max_overflowt _timeoutR t Lockt _overflow_lock( t selft creatort pool_sizet max_overflowt timeoutR t kw( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR ( s ? c C sN y | j j | t � Wn0 t j k rI z | j � Wd | j � Xn Xd S( N( R t putt Falset sqla_queuet Fullt closet _dec_overflow( R t conn( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyt _do_return_connn s c C s | j d k } y2 | o' | j | j k } | j j | | j � SWn t j k rW n X| r� | j | j k r� | s� | j � St j d | j � | j � | j f d d �� n | j � r� y | j � SWqt j � � | j � Wd QXqXn | j � Sd S( Ni����sS QueuePool limit of size %d overflow %d reached, connection timed out, timeout %0.2ft codet 3o7r( R R R t getR R t Emptyt _do_getR t TimeoutErrort sizet overflowt _inc_overflowt _create_connectionR t safe_reraiseR ( R t use_overflowt wait( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR% w s( c C s_ | j d k r" | j d 7_ t S| j �. | j | j k rQ | j d 7_ t St SWd QXd S( Ni����i ( R R t TrueR R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR) � s c C sI | j d k r" | j d 8_ t S| j � | j d 8_ t SWd QXd S( Ni����i ( R R R. 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R R# R R R R$ R' R R6 R7 t status( R R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyt dispose� s c C s, d | j � | j � | j � | j � f S( Ns_ Pool size: %d Connections in pool: %d Current Overflow: %d Current Checked out connections: %d( R' t checkedinR( t checkedout( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRB � s c C s | j j S( N( R R: ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR' � s c C s | j S( N( R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR � s c C s | j j � S( N( R t qsize( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRD � s c C s | j S( N( R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR( � s c C s | j j | j j � | j S( N( R R: RF R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRE � s ( t __name__t __module__t __doc__R t _is_asyncioR t QueueR R R R% R) R RA RC RB R' R RD R( RE ( ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR s& @ t AsyncAdaptedQueuePoolc B s e Z e Z e j Z e � Z RS( ( RG RH R. RJ R t AsyncAdaptedQueueR R R@ ( ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRL � s t FallbackAsyncAdaptedQueuePoolc B s e Z e j Z RS( ( RG RH R t FallbackAsyncAdaptedQueueR ( ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRN � s t NullPoolc B s; e Z d Z d � Z d � Z d � Z d � Z d � Z RS( sQ A Pool which does not pool connections. Instead it literally opens and closes the underlying DB-API connection per each connection open/close. Reconnect-related functions such as ``recycle`` and connection invalidation are not supported by this Pool implementation, since no connections are held persistently. c C s d S( NRP ( ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRB � s c C s | j � d S( N( R ( R R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR � s c C s | j � S( N( R* ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR% � s c C s_ | j j d � | j | j d | j d | j d | j d | j d | j d | j d | j �S( Ns Pool recreatingR0 R1 R2 R3 R/ R4 R5 ( R6 R7 R8 R9 R< R1 R= R> R; R? R@ ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRA s c C s d S( N( ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRC s ( RG RH RI RB R R% RA RC ( ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRP � s t SingletonThreadPoolc B sh e Z d Z e Z d d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s� A Pool that maintains one connection per thread. Maintains one connection per each thread, never moving a connection to a thread other than the one which it was created in. .. warning:: the :class:`.SingletonThreadPool` will call ``.close()`` on arbitrary connections that exist beyond the size setting of ``pool_size``, e.g. if more unique **thread identities** than what ``pool_size`` states are used. This cleanup is non-deterministic and not sensitive to whether or not the connections linked to those thread identities are currently in use. :class:`.SingletonThreadPool` may be improved in a future release, however in its current status it is generally used only for test scenarios using a SQLite ``:memory:`` database and is not recommended for production use. Options are the same as those of :class:`_pool.Pool`, as well as: :param pool_size: The number of threads in which to maintain connections at once. Defaults to five. :class:`.SingletonThreadPool` is used by the SQLite dialect automatically when a memory-based database is used. See :ref:`sqlite_toplevel`. i c K sJ t j | | | � t j � | _ t j � | _ t � | _ | | _ d S( N( R R R t localt _connt _fairyt sett _all_connsR' ( R R R R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR 5 s c C sh | j j d � | j | j d | j d | j d | j d | j d | j d | j d | j d | j �S( Ns Pool recreatingR R0 R1 R/ R2 R3 R4 R5 ( R6 R7 R8 R9 R' R< R1 R; R= R> R? R@ ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRA < s c C sG x3 | j D]( } y | j � Wq t k r1 q Xq W| j j � d S( s Dispose of this pool.N( RV R t Exceptiont clear( R R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRC J s c C s< x5 t | j � | j k r7 | j j � } | j � q Wd S( N( t lenRV R' t popR ( R t c( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyt _cleanupW s c C s d t | � t | j � f S( Ns" SingletonThreadPool id:%d size: %d( t idRY RV ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRB \ s c C s d S( N( ( R R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR b s c C s� y | j j � } | r | SWn t k r0 n X| j � } t j | � | j _ t | j � | j k rw | j � n | j j | � | S( N( RS t currentt AttributeErrorR* t weakreft refRY RV R' R\ t add( R R[ ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR% e s c C sP y | j j � } Wn t k r& n X| d k r= | j � St j | | j � S( N( RT R^ R_ t Nonet _checkout_existingR t _checkout( R t rec( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyt connects s c C s2 y | j ` Wn t k r n X| j | � d S( N( RT R^ R_ R ( R t record( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyt _return_conn� s ( RG RH RI R RJ R RA RC R\ RB R R% Rg Ri ( ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRQ s t StaticPoolc B s_ e Z d Z e j d � � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z RS( s A Pool of exactly one connection, used for all requests. Reconnect-related functions such as ``recycle`` and connection invalidation (which is also used to support auto-reconnect) are only partially supported right now and may not yield good results. c C s t | � S( N( R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyt connection� s c C s d S( NRj ( ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRB � s c C s? d | j k r; | j j d k r; | j j � | j d =n d S( NRk ( t __dict__Rk t dbapi_connectionRc R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRC � s c C sb | j j d � | j d | j d | j d | j d | j d | j d | j d | j d | j � S( Ns Pool recreatingR R0 R3 R/ R1 R2 R4 R5 ( R6 R7 R8 R9 R< R> R; R1 R= R? 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This will raise an exception if more than one connection is checked out at a time. Useful for debugging code that is using more connections than desired. c O sG d | _ t | _ | j d t � | _ d | _ t j | | | � d S( Nt store_traceback( Rc RS R t _checked_outRZ R. t _store_tracebackt _checkout_tracebackR R ( R t argsR ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR � s c C s d S( NRw ( ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRB � s c C s: | j s t d � � n t | _ | | j k s6 t � d S( Ns connection is not checked out( Ry t AssertionErrorR RS ( R R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyR � s c C s& t | _ | j r" | j j � n d S( N( R Ry RS R ( R ( ( sG /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/pool/impl.pyRC � s c C s_ | j j d � | j | j d | j d | j d | j d | j d | j d | j d | j �S( Ns Pool recreatingR1 R/ R0 R3 R2 R4 R5 ( R6 R7 R8 R9 R1 R; R< R> R= R? 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