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

["Stanislav Lukyanov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-8952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stanislav Lukyanov updated IGNITE-8952:
---------------------------------------
    Issue Type: Improvement  (was: Bug)

> Move CacheStore::loadCache to a separate interface
> --------------------------------------------------
>
>                 Key: IGNITE-8952
>                 URL: https://issues.apache.org/jira/browse/IGNITE-8952
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Stanislav Lukyanov
>            Priority: Major
>              Labels: newbie
>
> 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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