[jira] [Created] (IGNITE-8952) Move CacheStore::loadCache to a separate interface

[Anton Vinogradov (Jira)]

Stanislav Lukyanov created IGNITE-8952:
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             Summary: Move CacheStore::loadCache to a separate interface
                 Key: IGNITE-8952
                 URL: https://issues.apache.org/jira/browse/IGNITE-8952
             Project: Ignite
          Issue Type: Bug
            Reporter: Stanislav Lukyanov


3rd party persistence has three way of interacting with the backing storage:
- JCache's CacheLoader methods for read-through
- JCache's CacheWriter methods for write-through
- Ignite's CacheStore::loadCache for bulk cache preloading

Usually, one just uses a CacheStore implementation and provides a no-op implementation for the methods that are not needed (e.g. no-op implementation for write() if write-through isn't used). However, this adds certain redundancy.

In particular, if a user only wants cache preloading (loadCache()) but no read-through or write-through, they will need to provide a bunch of these no-op methods, which can seem messy.

Instead, it would be nice to move loadCache() method to a separate interface, say CachePreloader. This way we'll have 4 interfaces:
- JCache's CacheLoader for read-through
- JCache's CacheWriter for write-through
- Ignite's CachePreloader for loadCache()
- Ignite's CacheStore for all three together

One can either choose any combination of loader, writer and preloader, OR set the store.

The task is to
- extract CacheStore::loadCache into a new interface CachePreloader
- add CacheConfiguration::setCachePreloader
- make sure that setCachePreloader works alone or in combination with loader and writer, and doesn't work with store



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