Leverage IndexResolver for principal name index

[vpavic]

In Spring Session core we've recently introduced IndexResolver as strategy for resolving indexes. Common use case across all FindByIndexNameSessionRepository is principal name index.

See:

• IndexResolver
• DelegatingIndexResolver
• PrincipalNameIndexResolver
• RedisIndexedSessionRepository and RedisHttpSessionConfiguration as usage samples

[jxblum]

What is the mapping returned by resolveIndexesFor(<T extends Session>) in the IndexResolver mean?

It is a String to String mapping but I am not sure I am following what the String key and String value are for exactly?

After reviewing the PrincipleNameIndexResolver, it appears to be a Session attribute name followed by the value for that attribute in a given Session.