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FixedSizePool
(
size
=
10
,
default_timeout
=
10
,
labels
=
None
)
Concrete session pool implementation:
-
Pre-allocates / creates a fixed number of sessions.
-
"Pings" existing sessions via
session.existsbefore returning them, and replaces expired sessions. -
Blocks, with a timeout, when
getis called on an empty pool. Raises after timing out. -
Raises when
putis called on a full pool. That error is never expected in normal practice, as users should be callinggetfollowed byputwhenever in need of a session.
Parameters
size
int
fixed pool size
default_timeout
int
default timeout, in seconds, to wait for a returned session.
labels
dict (str -> str) or None
(Optional) user-assigned labels for sessions created by the pool.
Properties
labels
User-assigned labels for sesions created by the pool.
dict (str -> str)
Methods
bind
bind
(
database
)
Associate the pool with a database.
database
clear
clear
()
Delete all sessions in the pool.
get
get
(
timeout
=
None
)
Check a session out from the pool.
timeout
int
seconds to block waiting for an available session
`six.moves.queue.Empty
put
put
(
session
)
Return a session to the pool.
Never blocks: if the pool is full, raises.
`six.moves.queue.Full
session
session
(
**
kwargs
)
Check out a session from the pool.
SessionCheckout
