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/**
 * A {@link CachingLookupProvider} that never lookup in external system on cache miss and provides a
 * cache for holding all entries in the external system. The cache will be fully reloaded from the
 * external system by the {@link ScanTableSource.ScanRuntimeProvider} and reload operations will be
 * triggered by the {@link CacheReloadTrigger}.
 */
@PublicEvolving
public interface FullCachingLookupProvider extends LookupFunctionProvider {
    static FullCachingLookupProvider of(
            ScanTableSource.ScanRuntimeProvider scanRuntimeProvider,
            CacheReloadTrigger cacheReloadTrigger) {
        return new FullCachingLookupProvider() {
            @Override
            public ScanTableSource.ScanRuntimeProvider getScanRuntimeProvider() {
                return scanRuntimeProvider;
            }

            @Override
            public CacheReloadTrigger getCacheReloadTrigger() {
                return cacheReloadTrigger;
            }

            @Override
            public LookupFunction createLookupFunction() {
                return keyRow -> null;
            }
        };
    }

    /**
     * Get a {@link ScanTableSource.ScanRuntimeProvider} for scanning all entries from the external
     * lookup table and load into the cache.
     */
    ScanTableSource.ScanRuntimeProvider getScanRuntimeProvider();

    /** Get a {@link CacheReloadTrigger} for triggering the reload operation. */
    CacheReloadTrigger getCacheReloadTrigger();
}