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TransactionPingingPool(
size=10, default_timeout=10, ping_interval=3000, labels=None, database_role=None
)Concrete session pool implementation:
Deprecated: TransactionPingingPool no longer begins a transaction for each of its sessions at startup.
Hence the TransactionPingingPool is same as PingingPool and maybe removed in the future.
In addition to the features of PingingPool, this class
creates and begins a transaction for each of its sessions at startup.
When a session is returned to the pool, if its transaction has been
committed or rolled back, the pool creates a new transaction for the
session and pushes the transaction onto a separate queue of "transactions
to begin." The application is responsible for flushing this queue
as appropriate via the pool's begin_pending_transactions method.
Parameters | |
|---|---|
| Name | Description |
size |
int
fixed pool size |
default_timeout |
int
default timeout, in seconds, to wait for a returned session. |
ping_interval |
int
interval at which to ping sessions. |
labels |
dict (str -> str) or None
(Optional) user-assigned labels for sessions created by the pool. |
database_role |
str
(Optional) user-assigned database_role for the session. |
Methods
TransactionPingingPool
TransactionPingingPool(
size=10, default_timeout=10, ping_interval=3000, labels=None, database_role=None
)This throws a deprecation warning on initialization.
begin_pending_transactions
begin_pending_transactions()Begin all transactions for sessions added to the pool.
bind
bind(database)Associate the pool with a database.
| Parameter | |
|---|---|
| Name | Description |
database |
Database
database used by the pool to create sessions when needed. |
put
put(session)Return a session to the pool.
Never blocks: if the pool is full, raises.
| Parameter | |
|---|---|
| Name | Description |
session |
Session
the session being returned. |
| Exceptions | |
|---|---|
| Type | Description |
`queue.Full | if the queue is full. |