[jboss-jira] [JBoss JIRA] (AG-136) Add a safe callback interface for pool events

[Luis Barreiro (Jira)]

     [ https://issues.redhat.com/browse/AG-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luis Barreiro closed AG-136.
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> Add a safe callback interface for pool events
> ---------------------------------------------
>
>                 Key: AG-136
>                 URL: https://issues.redhat.com/browse/AG-136
>             Project: Agroal
>          Issue Type: Feature Request
>          Components: api, pool
>    Affects Versions: 1.7
>            Reporter: Luis Barreiro
>            Assignee: Luis Barreiro
>            Priority: Major
>             Fix For: 1.8
>
>
> There is a need for a callback to intercept pool events that is safe for applications to use.
> Right now the current listener interface is fine for container implementations, but should not be used by higher level applications because:
> * The {{AgroalDataSourceListener}} interface was not designed with the Interceptor concept in mind. Agroal always invoke the listeners in the given order, so if there are 2 listeners with common concerns,only one of them will be effective.
> * The Listener gives access to the raw {{java.sql.Connection}} and therefore any error may cause chaos on the pool (leave an invalid connection on the pool, etc.)
> * Some methods on the listener are invoked by Agroal's own thread and therefore should not execute any long running task (that is not a problem in the context of this issue, but may be if we expose this interface as API)
> * When running Agroal with a TransactionManager, the life-cycle of the connections can be slightly different as this is associated with the transaction. This does not map well on the current listener interface.
> A new interface PoolInteceptor should be added to address this issues.



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