io.micronaut.jdbc.metadata

Interface DataSourcePoolMetadata<T extends DataSource>

Type Parameters:

T - datasource DataSource

All Known Implementing Classes:

AbstractDataSourcePoolMetadata

public interface DataSourcePoolMetadata<T extends DataSource>

Provides access meta-data that is commonly available from most pooled DataSource implementations.

Since:

2.0.0

Author:

Stephane Nicoll, Christian Oestreich

Method Summary

Modifier and Type	Method and Description
Integer	getActive() Return the current number of active connections that have been allocated from the data source or null if that information is not available.
T	getDataSource() Allow implementations to get the datasource for usage in metrics, etc.
Boolean	getDefaultAutoCommit() The default auto-commit state of connections created by this pool.
Integer	getIdle() Return the number of idle connections in the pool.
Integer	getMax() Return the maximum number of active connections that can be allocated at the same time or -1 if there is no limit.
Integer	getMin() Return the minimum number of idle connections in the pool or null if that information is not available.
Float	getUsage() Return the usage of the pool as value between 0 and 1 (or -1 if the pool is not limited).
String	getValidationQuery() Return the query to use to validate that a connection is valid or null if that information is not available.

Method Detail

getDataSource

T getDataSource()

Allow implementations to get the datasource for usage in metrics, etc.

Returns:

the datasource

getIdle

Integer getIdle()

Return the number of idle connections in the pool.

Returns:

the idle value

getUsage

Float getUsage()

Return the usage of the pool as value between 0 and 1 (or -1 if the pool is not limited).

• 1 means that the maximum number of connections have been allocated
• 0 means that no connection is currently active
• -1 means there is not limit to the number of connections that can be allocated

This may also return null if the data source does not provide the necessary information to compute the poll usage.

Returns:

the usage value or null

getActive

Integer getActive()

Return the current number of active connections that have been allocated from the data source or null if that information is not available.

Returns:

the number of active connections or null

getMax

Integer getMax()

Return the maximum number of active connections that can be allocated at the same time or -1 if there is no limit. Can also return null if that information is not available.

Returns:

the maximum number of active connections or null

getMin

Integer getMin()

Return the minimum number of idle connections in the pool or null if that information is not available.

Returns:

the minimum number of active connections or null

getValidationQuery

String getValidationQuery()

Return the query to use to validate that a connection is valid or null if that information is not available.

Returns:

the validation query or null

getDefaultAutoCommit

Boolean getDefaultAutoCommit()

The default auto-commit state of connections created by this pool. If not set (null), default is JDBC driver default (If set to null then the java.sql.Connection.setAutoCommit(boolean) method will not be called.)

Returns:

the default auto-commit state or null