IdStory Identity Manager

After reading about different cache providers i discoveredd, that main challenge would be how to merge cache configuration from all deployed modules. The thing is, that all cache providers require you to specify which caches is your application going to use in advance (which was not the case with SimpleCache which we used up to this point).

I tried two approaches - using tagging interface and defining caches in module descriptor. Unfortunatelly both ended up not working, because it creates cyclic dependencies among spring beans (Repository beans).

There are still other ways to achieve that, which i will try today.

Distributed caching is implemented in pstrunc/2024-clusterred-cache. We support on-heap and distributed caches and caching of null values. Documentation is here https://wiki.czechidm.com/devel/documentation/caching.

I also disabled displaying cache size on FE and its usage in tests since it does not make sense in distributed environment.

Would you please review this task Radek? Thank you.

I did test and code review, clustered cache works, awesome! Cache configuration is really complex, good job to find a way.

Review notes:
- cache cannot be disabled by configuration ('spring.cache.type=none').
- terracota configuration properties should not start with 'idm.sec' prefix - is not configurable by our service (from UI). And add please new configuration section into wiki - confugration backend.
- a lot of warnings (21) is in code, javadoc is missing (e.g. CoreCacheConfiguration).
- stream formating - each stream commad should be on new line (e.g. ClusteredEhCacheConfiguration).
- Builder classes have templates 'KEY' and 'VALUE', but 'K' and 'V' template is used in all other places (wrappers - there should be 'V' instead 'K', generalized classes), it could be unified (i prefer 'K', 'V' :)).
- Builder classes define templates, but keyType and valueType has to be defined again redundantly - remove template or use GenericTypeResolver, when builder is constructed (e.g. AbstractReadDtoService).
- Package with wrapper could be renamed to 'domain', maybe we will have another domain dtos for cache configuration in future.
- Methods for bean creation (e.g. InMemoryEhCacheConfiguration#ehCacheManager) are package protected now - add please public modifier and add javadoc (~ same as cache purpose in locale, but BE developer will not have frontend opened somethimes:)).

I fixed all mentioned issues except for Builder refactoring, because GenericTypeResolver does not work for me in this case. Would you please review this again? Thanks.

I did test and review again, it's awesome, documentation is nice, thx!

Merged into develop.

So documenation remains only:
- And add please new configuration section into wiki - confugration backend (and move top cache notes and spring.cache.type there .)).
- and Marcel's note above
- then you could close this ticket please :)

Note: A lot of warning were still there, i fixed them https://github.com/bcvsolutions/CzechIdMng/commit/6e875256d4c0cb5d7973bb9a95e0199d931544a0 :)

I've added new configuration properties into documentation:
https://wiki.czechidm.com/devel/documentation/application_configuration/dev/backend#cache

Note: Developer guide can be split (e.g into admin guide / tutorial) in future, all information is there.