}
        if (value instanceof Factory) {
            return ((Factory<?>) value).create();
        }
        return value;
    }

    public static boolean isDeferred(Object value) {
        return value instanceof Provider
            || value instanceof Factory
            || isNestableDeferred(value);
    }

import org.gradle.internal.Factory;

/**
 * A specialized version of multi cause exception that is cheaper to create
 * because we avoid to fill a stack trace, and the message MUST be generated lazily.
 */
@Contextual
public class DefaultMultiCauseExceptionNoStackTrace extends DefaultMultiCauseException {
    public DefaultMultiCauseExceptionNoStackTrace(Factory<String> messageFactory) {
        super(messageFactory);

        when:
        def result = actualBuilder.buildAll("model", project)

        then:
        result == "result"

        and:
        1 * projectStateRegistry.allowUncontrolledAccessToAnyProject(_) >> { Factory factory -> factory.create() }
        1 * builder2.buildAll("model", project) >> "result"
        0 * _
    }

     */
    boolean getAllowsParallelExecution();

    /**
     * Releases any project state locks or task execution locks currently held by the current thread and executes the {@link Factory}.
     * Upon completion of the {@link Factory}, if a lock was held at the time the method was called, then it will be reacquired.
     * If no locks were held at the time the method was called, then no attempt will be made to reacquire a lock on completion.

    }

    public static DocumentBuilderFactory newInstance(final boolean external) {
        final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        if (!external) {
            try {
                factory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
                factory.setAttribute(XMLConstants.ACCESS_EXTERNAL_SCHEMA, "");
            } catch (final Exception e) {

    level = DeprecationLevel.HIDDEN,
  )
  @JvmStatic
  fun createFactory(client: OkHttpClient) = createFactory(client as Call.Factory)

  @JvmStatic
  fun createFactory(callFactory: Call.Factory): EventSource.Factory {
    return EventSource.Factory { request, listener ->
      val actualRequest =
        if (request.header("Accept") == null) {

        def result = selector.select(variantSetOf(variants), requestedAttributes, false, factory)

        then:
        result == transformed

        1 * attributeMatcher.matches(_, _, _) >> Collections.emptyList()
        1 * consumerProvidedVariantFinder.findTransformedVariants(variants, requestedAttributes) >> transformedVariants

/**
 * Synchronizes access to some resource, by making sure that 2 threads do not try to produce it at the same time.
 * The resource to be accessed is represented by a key, and the factory is whatever needs to be done to produce it.
 * This is <b>not</b> a cache. The factory should take care of caching wherever it makes sense.
 *
 * <p>

}

repositories {
    mavenCentral()
}

// tag::object-factory[]
tasks.register("myObjectFactoryTask") {
    doLast {
        def objectFactory = project.objects
        def myProperty = objectFactory.property(String)
        myProperty.set("Hello, Gradle!")
        println myProperty.get()
    }
}
// end::object-factory[]

// tag::object-factory-inject[]
abstract class MyObjectFactoryTask extends DefaultTask {

    private final FileAccess fileAccess;
    private final Supplier<BTreePersistentIndexedCache<K, V>> factory;
    private BTreePersistentIndexedCache<K, V> cache;

    public DefaultMultiProcessSafeIndexedCache(Supplier<BTreePersistentIndexedCache<K, V>> factory, FileAccess fileAccess) {
        this.factory = factory;
        this.fileAccess = fileAccess;
    }

    @Override
    public String toString() {