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A revolutionary ORM framework for both java and kotlin

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package org.babyfish.jimmer.sql.cache;

import org.babyfish.jimmer.impl.util.ClassCache;
import org.babyfish.jimmer.meta.ImmutableProp;
import org.babyfish.jimmer.meta.ImmutableType;
import org.babyfish.jimmer.meta.TargetLevel;
import org.babyfish.jimmer.sql.JSqlClient;
import org.babyfish.jimmer.sql.fetcher.Fetcher;
import org.babyfish.jimmer.sql.fetcher.IdOnlyFetchType;
import org.babyfish.jimmer.sql.fetcher.impl.FetcherImpl;

import java.sql.Connection;
import java.util.Collection;
import java.util.Map;

@FunctionalInterface
public interface CacheLoader {

    Map loadAll(Collection keys);

    static  CacheLoader objectLoader(
            JSqlClient sqlClient,
            Connection con,
            Class entityType
    ) {
        return keys -> sqlClient
                .getEntities()
                .forConnection(con)
                .findMapByIds(ObjectCacheFetchers.of(entityType), keys);
    }
}

class ObjectCacheFetchers {

    private static final ClassCache> CACHE = new ClassCache<>(
            ObjectCacheFetchers::create,
            false
    );

    @SuppressWarnings("unchecked")
    static  Fetcher of(Class type) {
        return (Fetcher) CACHE.get(type);
    }

    @SuppressWarnings("unchecked")
    private static Fetcher create(Class type) {
        ImmutableType immutableType = ImmutableType.get(type);
        Fetcher fetcher = new FetcherImpl<>((Class