return importModel;
    }

    private static <T> T cache(
            ModelCache cache, String groupId, String artifactId, String version, String tag, Callable<T> supplier) {
        Supplier<T> s = asSupplier(supplier);
        if (cache == null) {
            return s.get();
        } else {
            return cache.computeIfAbsent(groupId, artifactId, version, tag, s);
        }
    }

/**
 * A container for data that is specific to a session.
 * All components may use this storage to associate arbitrary data with a session.
 * <p>
 * Unlike a cache, this session data is not subject to purging. For this same reason, session data should also not be
 * abused as a cache (i.e. for storing values that can be re-calculated) to avoid memory exhaustion.
 * <p>
 * <strong>Note:</strong> Actual implementations must be thread-safe.
 *

            List<? extends InterpolationPostProcessor> postProcessors,
            ModelBuilderRequest request,
            ModelProblemCollector problems) {
        Map<String, String> cache = new HashMap<>();
        StringSearchInterpolator interpolator = new StringSearchInterpolator();
        interpolator.setCacheAnswers(true);
        for (ValueSource vs : valueSources) {

                throw new PluginManagerException(plugin, e.getMessage(), e);
            }
        }
        pluginArtifactsCache.register(project, cacheKey, recordArtifacts);

        // create and cache extensions realms
        final ExtensionRealmCache.Key extensionKey = extensionRealmCache.createKey(artifacts);
        extensionRecord = extensionRealmCache.get(extensionKey);
        if (extensionRecord == null) {

    Collection<Listener> getListeners();

    /**
     * Shortcut for {@code getService(RepositoryFactory.class).createLocal(...)}.
     *
     * @param path location of the local repository to create
     * @return cache of artifacts downloaded from a remote repository or built locally
     *
     * @see org.apache.maven.api.services.RepositoryFactory#createLocal(Path)
     */
    @Nonnull

        if (cache.containsKey(key)) {
            throw new IllegalStateException("Duplicate artifact resolution result for project " + key);
        }
    }

    @Override
    public void flush() {
        cache.clear();
    }

    @Override
    public void register(MavenProject project, Key cacheKey, CacheRecord record) {
        // default cache does not track record usage
    }

import org.apache.maven.api.services.Source;

/**
 * Caches auxiliary data used during model building like already processed raw/effective models. The data in the cache
 * is meant for exclusive consumption by the model builder and is opaque to the cache implementation. The cache key is
 * formed by a combination of group id, artifact id, version and tag. The first three components generally refer to the

import java.util.Set;
import java.util.function.Predicate;

import org.apache.maven.api.JavaPathType;
import org.apache.maven.api.PathType;

/**
 * Cache of {@link PathModularization} instances computed for given {@link Path} elements.
 * The cache is used for avoiding the need to reopen the same files many times when the
 * same dependency is used for different scope. For example a path used for compilation

/**
 * Handles profile injection into the model.
 *
 */
@Named
@Singleton
public class DefaultProfileInjector implements ProfileInjector {

    private static final Map<Model, Map<List<Profile>, Model>> CACHE = Collections.synchronizedMap(new WeakHashMap<>());

    // In order for the weak hash map to work correctly, we must not hold any reference to

        } else {
            if (anew) {
                cache = new ConcurrentHashMap<>();
                repositoryCache.put(session, KEY, cache);
            } else {
                cache = (ConcurrentHashMap<Object, Supplier<?>>)
                        repositoryCache.computeIfAbsent(session, KEY, ConcurrentHashMap::new);
            }
            return new DefaultModelCache(cache);
        }
    }