[hibernate-dev] ConnectionObserver

Gail Badner gbadner at redhat.com
Tue Aug 20 16:43:19 EDT 2019

In 4.2 and 4.3, it was possible to add a ConnectionObserver
using org.hibernate.engine.jdbc.spi.LogicalConnectionImplementor#addObserver(ConnectionObserver

Starting in 5.0, LogicalConnectionImplementor was moved
to org.hibernate.resource.jdbc.spi, and it's no longer possible to add a

For now, I think it's OK to change JdbcObserverImpl#observers from a
List<ConnectionObserver>, to:

private final transient ConnectionObserver observer;

Also, I'm fine with ConnectionObserver being deprecated, and later removed.

Steve, WDYT?

On Tue, Aug 20, 2019 at 10:55 AM Sanne Grinovero <sanne at hibernate.org>

> While refactoring some related optimisations, I noticed there's
> currently no way to register a custom ConnectionObserver.
> There seems to be only one implementation, which is registered by default:
>  -
> org.hibernate.internal.ConnectionObserverStatsBridge#ConnectionObserverStatsBridge
> Some questions:
> # Is this expected?
> # Should we deprecate the SPI so to make this more explict in the
> future, and possibly eventually discuss removing it?
> # Since I'm working on performance optimisations, may I take advantage
> currently of the fact that there's only one registered? We're
> currently iterating "the list of obeservers"...
> Thanks
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