org.apache.solr.search

## Interface CacheRegenerator

- All Known Implementing Classes:
    NoOpRegenerator, SolrPluginUtils.IdentityRegenerator

      public interface CacheRegenerator

  Implementations of `CacheRegenerator` are used in autowarming to populate a new cache based on an old cache. `regenerateItem` is called for each item that should be inserted into the new cache.

  Implementations should have a noarg constructor and be thread safe (a single instance will be used for all cache autowarmings).

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `regenerateItem(SolrIndexSearcher newSearcher, SolrCache newCache, SolrCache oldCache, Object oldKey, Object oldVal)` Regenerate an old cache item and insert it into `newCache`

- - ### Method Detail

    - #### regenerateItem

          boolean regenerateItem(SolrIndexSearcher newSearcher,
                                 SolrCache newCache,
                                 SolrCache oldCache,
                                 Object oldKey,
                                 Object oldVal)
                          throws IOException

      Regenerate an old cache item and insert it into `newCache`
      Parameters:
        `newSearcher` - the new searcher who's caches are being autowarmed
        `newCache` - where regenerated cache items should be stored. the target of the autowarming
        `oldCache` - the old cache being used as a source for autowarming
        `oldKey` - the key of the old cache item to regenerate in the new cache
        `oldVal` - the old value of the cache item
      Returns:
        true to continue with autowarming, false to stop
      Throws:
        `IOException`

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