/**
 * Represents a filter for a implementation of a Java Virtual Machine.
 *
 * @since 6.8
 */
public final class JvmImplementation {

    /**
     * Vendor-specific virtual machine implementation.
     *
     * Acts as a placeholder and matches any implementation from any vendor.
     * Usually used to override specific implementation requests.
     */

     * @param serviceInstance The service implementation.
     */
    <T> void add(Class<T> serviceType, T serviceInstance);

    /**
     * Adds a service to this registry. The implementation class should have a single public constructor, and this constructor can take services to be injected as parameters.
     *
     * @param serviceType The service implementation to make visible.
     */
    void add(Class<?> serviceType);

    /**
     * Writes a signed 64 bit long value. The implementation may encode the value as a variable number of bytes, not necessarily as 8 bytes.
     */
    void writeLong(long value) throws IOException;

    /**
     * Writes a signed 64 bit long value whose value is likely to be small and positive but may not be. The implementation may encode the value in a way that is more efficient for small positive
     * values.

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) {

            @Override
            public void visitImplementation(Class<?> implementation) {
                workClass.set(GeneratedSubclasses.unpack(implementation));
            }

            @Override
            public void visitImplementation(ImplementationSnapshot implementation) {
            }
        });

     * @param classfileBuffer the buffer that contains class implementation bytes in class file format - must not be modified
     * @return new class implementation bytes in class file format or {@code null} to continue loading the original implementation
     */
    @Nullable

        private final JvmVendorSpec vendor;
        private final JvmImplementation implementation;

        public Key(@Nullable JavaLanguageVersion languageVersion, @Nullable JvmVendorSpec vendor, @Nullable JvmImplementation implementation) {
            this.languageVersion = languageVersion;
            this.vendor = vendor;
            this.implementation = implementation;
        }

        @Override
        public boolean equals(Object o) {

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 {

        return String.format(
            "The service implementation '%s' is registered in the '%s' scope but does not declare it explicitly.\n" +
                "The implementation appears to serve %s.\n" +
                "Try the following:\n" +

          .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) {