org.springframework.boot.jdbc.metadata

Interface DataSourcePoolMetadata

All Known Implementing Classes:

AbstractDataSourcePoolMetadata, CommonsDbcp2DataSourcePoolMetadata, HikariDataSourcePoolMetadata, TomcatDataSourcePoolMetadata

public interface DataSourcePoolMetadata

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

Since:

2.0.0

Author:

Stephane Nicoll

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.
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

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