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.

Return

the usage value or null