import java.util.Queue;
import java.util.concurrent.atomic.AtomicReference;

public class IsolationScheme<IMPLEMENTATION, PARAMS> {
    private final Class<IMPLEMENTATION> interfaceType;
    private final Class<PARAMS> paramsType;
    private final Class<? extends PARAMS> noParamsType;

    public IsolationScheme(Class<IMPLEMENTATION> interfaceType, Class<PARAMS> paramsType, Class<? extends PARAMS> noParamsType) {

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.function.Function;

/**
 * Constructs the application and implementation classpaths for a test process,
 * while also optionally loading test framework implementation dependencies from
 * the distribution.
 *
 * @see ForkedTestClasspath
 */
public class ForkedTestClasspathFactory {

          .build();

  /**
   * type → implementation. Inherently mutable interfaces and abstract classes are mapped to their
   * default implementations and are "new"d upon get().
   */
  private static final ConcurrentMap<Class<?>, Class<?>> implementations = Maps.newConcurrentMap();

  private static <T> void setImplementation(Class<T> type, Class<? extends T> implementation) {

          .build();

  /**
   * type → implementation. Inherently mutable interfaces and abstract classes are mapped to their
   * default implementations and are "new"d upon get().
   */
  private static final ConcurrentMap<Class<?>, Class<?>> implementations = Maps.newConcurrentMap();

  private static <T> void setImplementation(Class<T> type, Class<? extends T> implementation) {

            ImplementationInfo implementation = request.getImplementationInfo();
            List<ParameterSpec> parameters = callable.getParameters().stream()
                .map(parameter -> ParameterSpec.builder(typeName(parameter.getParameterType()), parameter.getName()).build())
                .collect(Collectors.toList());
            MethodSpec spec = MethodSpec.methodBuilder(implementation.getName())

                    publicType, implementationRegistration.getSource()));
            }
            if (managedPublicType) {
                throw new IllegalArgumentException(String.format("Cannot specify default implementation for managed type '%s'", publicType));
            }

    return LexicographicalComparatorHolder.PureJavaComparator.INSTANCE;
  }

  /**
   * Provides a lexicographical comparator implementation; either a Java implementation or a faster
   * implementation based on {@link Unsafe}.
   *
   * <p>Uses reflection to gracefully fall back to the Java implementation if {@code Unsafe} isn't
   * available.
   */
  @VisibleForTesting
  static class LexicographicalComparatorHolder {

      }
      return max(estimatedSize, 0);
    }

    @Override
    public final int characteristics() {
      return characteristics;
    }
  }

  /**
   * Implementation of {@link Stream#flatMap} with an object spliterator output type.
   *
   * <p>To avoid having this type, we could use {@code FlatMapSpliterator} directly. The main

    return LexicographicalComparatorHolder.PureJavaComparator.INSTANCE;
  }

  /**
   * Provides a lexicographical comparator implementation; either a Java implementation or a faster
   * implementation based on {@link Unsafe}.
   *
   * <p>Uses reflection to gracefully fall back to the Java implementation if {@code Unsafe} isn't
   * available.
   */
  @VisibleForTesting
  static class LexicographicalComparatorHolder {

    }

    public void blankLine() {
        node("");
    }

    /**
     * Starts a new node with the given type name.
     */
    public TreeFormatter node(Class<?> type) {
        // Implementation is currently dumb, can be made smarter
        if (type.isInterface()) {
            node("Interface ");
        } else {
            node("Class ");
        }
        appendType(type);
        return this;