}
            return new DefaultModelCache(cache);
        }
    }

    private final ConcurrentMap<Object, Supplier<?>> cache;

    public DefaultModelCache() {
        this(new ConcurrentHashMap<>());
    }

    private DefaultModelCache(ConcurrentMap<Object, Supplier<?>> cache) {
        this.cache = requireNonNull(cache);
    }

    @Override
    @SuppressWarnings({"unchecked"})

     *
     * <strong>Implementation note:</strong> while this method return type is {@link Map}, the
     * returned map instance implements {@link java.util.concurrent.ConcurrentMap} as well.
     *
     * @throws org.apache.maven.api.services.MavenException if not called from the within a mojo execution
     */
    @Nonnull
    Map<String, Object> getPluginContext(@Nonnull Project project);

        private final RepositorySystemSession session;
        private final List<RemoteRepository> repositories;
        private final ReactorModelPool modelPool;
        private final ConcurrentMap<String, Object> parentCache;
        private final ModelTransformerContextBuilder transformerContextBuilder;
        private final ExecutorService executor;
        private final ModelCache modelCache;

import java.util.Properties;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.function.BinaryOperator;
import java.util.stream.Collector;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.NonNull;