Class TransactionPingingPool (3.28.0)

Version 3.28.0

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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.