This commit restructures configuration support for Redis-backed
HttpSession with aim to enable users to easily select the
SessionRepository implementation they prefer to use.
This is achieved by introducing [at]EnableRedisIndexedHttpSession
annotation that can be used to configure RedisIndexedSessionRepository,
while the existing [at]EnableRedisHttpSession will going forward
configure RedisSessionRepository as the SessionRepository implementation
used by Spring Session.
Additionally, this also introduces AbstractRedisHttpSessionConfiguration
as the base configuration class that manages common aspects of
Redis-backed HttpSession support, which is then extended by more
specific configuration classes that provide specific SessionRepository
implementation.
Closes gh-2122
As of spring-projects/spring-security#11653, Spring Security's [at]Enable*Security annotations are not meta annotated with [at]Configuration which breaks some of our tests.
This commit adds missing [at]Configuration annotations where needed.
Closes gh-2118
