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AbstractSessionPool(labels=None, database_role=None)Specifies required API for concrete session pool implementations.
Parameters | |
|---|---|
| Name | Description |
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. |
Properties
database_role
User-assigned database_role for sessions created by the pool.
| Returns | |
|---|---|
| Type | Description |
str | database_role assigned by the user |
labels
User-assigned labels for sessions created by the pool.
| Returns | |
|---|---|
| Type | Description |
dict (str -> str) | labels assigned by the user |
Methods
bind
bind(database)Associate the pool with a database.
| Parameter | |
|---|---|
| Name | Description |
database |
Database
database used by the pool to create sessions when needed. Concrete implementations of this method may pre-fill the pool using the database. |
| Exceptions | |
|---|---|
| Type | Description |
NotImplementedError | abstract method |
clear
clear()Delete all sessions in the pool.
Concrete implementations of this method are allowed to raise an error to signal that the pool is full, or to block until it is not full.
| Exceptions | |
|---|---|
| Type | Description |
NotImplementedError | abstract method |
get
get()Check a session out from the pool.
Concrete implementations of this method are allowed to raise an error to signal that the pool is exhausted, or to block until a session is available.
| Exceptions | |
|---|---|
| Type | Description |
NotImplementedError | abstract method |
put
put(session)Return a session to the pool.
| Parameter | |
|---|---|
| Name | Description |
session |
Session
the session being returned. Concrete implementations of this method are allowed to raise an error to signal that the pool is full, or to block until it is not full. |
| Exceptions | |
|---|---|
| Type | Description |
NotImplementedError | abstract method |
session
session(**kwargs)Check out a session from the pool.
| Returns | |
|---|---|
| Type | Description |
SessionCheckout | a checkout instance, to be used as a context manager for accessing the session and returning it to the pool. |