this is just a marker file....

 * under the License.
 */
package org.apache.maven.api;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.ThreadSafe;

/**
 * Marker interface for all services provided by the {@link Session}.
 * <p>
 * Services can be retrieved from the session using the
 * {@link Session#getService(Class)} method.
 *
 * @since 4.0.0
 * @see Session#getService(Class)

public interface RepositorySystemSessionFactory {
    /**
     * Creates "ready to use" session builder instance. The factory does not set up one thing: the
     * {@link org.eclipse.aether.repository.WorkspaceReader}s, that is caller duty to figure out. Workspace readers
     * should be set up as very last thing before using resolver session, that is built by invoking
     * {@link SessionBuilder#build()} method.
     *

 * prior notice.
 *
 * @since 3.0
 */
public interface PluginDescriptorCache {

    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    @FunctionalInterface
    interface PluginDescriptorSupplier {
        PluginDescriptor load()

 * without prior notice.
 *
 */
public interface ExtensionRealmCache {
    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    /**
     * CacheRecord
     */
    class CacheRecord {

        private final ClassRealm realm;

        private final ExtensionDescriptor descriptor;

            this.realm = realm;
            this.artifacts = artifacts;
        }
    }

    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    @FunctionalInterface
    interface PluginRealmSupplier {
        CacheRecord load() throws PluginResolutionException, PluginContainerException;
    }

    Key createKey(

         * processes one artifact at a time and hence cannot associate the artifacts from the same project to use the
         * same version index. Allowing the caller to pass in metadata from a previous deployment allows to re-establish
         * the association between the artifacts of the same project.
         */

    /**
     * Puts the specified data into the cache. <strong>Warning:</strong> The cache will directly save the provided
     * reference. If the cached data is mutable, i.e. could be modified after being put into the cache, the caller is
     * responsible for creating a copy of the original data and store the copy in the cache.
     *
     * @param request The repository request from which this cache was retrieved, must not be {@code null}.

 *
 */
public interface Source {

    /**
     * Gets a byte stream to the source contents. Closing the returned stream is the responsibility of the caller.
     *
     * @return A byte stream to the source contents, never {@code null}.
     * @throws IOException in case of IO issue
     */
    InputStream getInputStream() throws IOException;

    /**

 * prior notice.
 *
 */
public interface PluginArtifactsCache {

    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    /**
     * CacheRecord
     */
    class CacheRecord {

        private final List<Artifact> artifacts;

        public List<Artifact> getArtifacts() {