This commit optimizes session attribute saving by ensuring batch updates are used whenever possible. To make this possible, delta now tracks operations for each attribute change in order to be able to deduce SQL operation.
Additionally, if there is only a single attribute change, regular update is executed rather than batch operation.
Closes gh-1051
Previously, SessionResultSetExtractor used JdbcSession.setAttribute which had a side effect of freshly loaded session potentially having a non-empty delta and/or changed flag set. This commit optimizes session retrieval to invoke setAttribute directly on the delegate, therefore preventing unnecessary modifications of delta and change flags.
Closes gh-1042
This commit improves JDBC configuration by introducing `@SpringSessionDataSource` qualifier for explicitly declaring a `DataSource` to be used by Spring Session. This is in particular useful in scenarios with multiple `DataSource` beans present in the application context.
As a consequence, JDBC configuration is simplified and no longer registers a Spring Session specific `JdbcTemplate` bean.
Closes gh-863
This commit improves session cleanup handling in `JdbcOperationsSessionRepository#cleanUpExpiredSessions` by optimizing the used SQL statement. This is done by calculating the session expiry time when persisting the session, which in turn allows the cleanup SQL statement to be more index-friendly.
Closes gh-847
