public int hashCode() {
            return hash;
        }
    }

    static class CachingSupplier<T> implements Supplier<T> {
        final Supplier<T> supplier;
        volatile Object value;

        CachingSupplier(Supplier<T> supplier) {
            this.supplier = supplier;
        }

        @Override
        @SuppressWarnings({"unchecked", "checkstyle:InnerAssignment"})
        public T get() {

                }
            }
            return model;
        }

        public Model computeIfAbsent(Supplier<Model> supplier) {
            if (!set) {
                synchronized (this) {
                    if (!set) {
                        this.set = true;
                        this.model = supplier.get();
                        this.notifyAll();
                    }
                }
            }

        throw (T) t; // rely on vacuous cast
    }

    static class LazyMap<K, V> extends AbstractMap<K, V> {
        private final Supplier<Map<K, V>> supplier;
        private volatile Map<K, V> delegate;

        LazyMap(Supplier<Map<K, V>> supplier) {
            this.supplier = supplier;
        }

        @Override
        public Set<Entry<K, V>> entrySet() {
            if (delegate == null) {

    /* MNG-786*/
    @Test
    void testProfileModules() throws Exception {
        PomTestWrapper pom = buildPom("profile-module", "a");
        assertEquals("test-prop", pom.getValue("properties[1]/b")); // verifies profile applied
        assertEquals(4, ((List<?>) pom.getValue("modules")).size());
        assertEquals("module-2", pom.getValue("modules[1]"));
        assertEquals("module-1", pom.getValue("modules[2]"));

 * model builder.
 *
 */
public interface ModelCache {

    <T> T computeIfAbsent(String groupId, String artifactId, String version, String tag, Supplier<T> data);

    <T> T computeIfAbsent(Source path, String tag, Supplier<T> data);

    }

    public PluginDescriptor get(Key cacheKey) {
        return clone(descriptors.get(cacheKey));
    }

    @Override
    public PluginDescriptor get(Key key, PluginDescriptorSupplier supplier)
            throws PluginDescriptorParsingException, PluginResolutionException, InvalidPluginDescriptorException {

        try {
            PluginDescriptor desc = descriptors.get(key);
            if (desc == null) {

     */
    @Test
    void testPomAndSettingsInterpolation() throws Exception {
        PomTestWrapper pom = buildPom("test-pom-and-settings-interpolation");
        assertEquals("applied", pom.getValue("properties/settingsProfile"));
        assertEquals("applied", pom.getValue("properties/pomProfile"));
        assertEquals("settings", pom.getValue("properties/pomVsSettings"));

     */
    TAGLETS("-tagletpath");

    /**
     * Creates a path identified by the Java {@code --patch-module} option.
     * Contrarily to the other types of paths, this path is applied to only
     * one specific module. Used for compilation and execution among others.
     *
     * <p><b>Context-sensitive interpretation:</b>

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

import java.util.function.Supplier;

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

/**
 * This interface supplies the API for providing feedback to the user from the <code>Mojo</code>, using standard
 * <code>Maven</code> channels.<br>

            requestExtender.extend(request);
        }

        MavenSessionBuilderSupplier supplier = new MavenSessionBuilderSupplier(repoSystem);
        SessionBuilder sessionBuilder = supplier.get();
        sessionBuilder.setArtifactTypeRegistry(new TypeRegistryAdapter(typeRegistry)); // dynamic
        sessionBuilder.setCache(request.getRepositoryCache());