*/
  @RestrictedApi(
      explanation = "PatternCompiler is an implementation detail of com.google.common.base",
      allowedOnPath = ".*/com/google/common/base/.*")
  CommonPattern compile(String pattern);

  /**
   * Returns {@code true} if the regex implementation behaves like Perl -- notably, by supporting
   * possessive quantifiers but also being susceptible to catastrophic backtracking.

final class Platform {
  /** Returns the platform preferred implementation of a map based on a hash table. */
  static <K extends @Nullable Object, V extends @Nullable Object>
      Map<K, V> newHashMapWithExpectedSize(int expectedSize) {
    return CompactHashMap.createWithExpectedSize(expectedSize);
  }

  /**
   * Returns the platform preferred implementation of an insertion ordered map based on a hash
   * table.
   */

 * One notable exception is the computation of the early {@code session.rootDirectory}
 * property which happens very early.  The implementation used in this case
 * will be discovered using the JDK service mechanism.
 *
 * The default implementation will look for a {@code .mvn} child directory
 * or a {@code pom.xml} containing the {@code root="true"} attribute.
 *
 * @see DefaultRootLocator
 */

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * Multiset implementation that uses hashing for key and entry access.
 *
 * @author Kevin Bourrillion
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible(serializable = true, emulated = true)
@ElementTypesAreNonnullByDefault

        log(msg, level);
    }

    /**
     * Overrides the default implementation, which doesn't delegate to {@link #log(String, int)}.
     */
    @Override
    public void warn(String msg) {
        logger.warn(msg);
    }

    /**
     * Overrides the default implementation, which doesn't delegate to {@link #log(String, int)}.
     */
    @Override
    public void error(String msg) {

 *
 * The semantics of each method is completely up to the implementation. For example, {@link BeanDynamicObject}
 * provides a dynamic view of the functionality of an object and does not provide any decoration or extra functionality.
 * The {@link org.gradle.internal.extensibility.ExtensibleDynamicObject} implementation on the other hand does provide extra functionality.
 */

    /**
     * The base name of this component.
     */
    String getName();

    /**
     * A path that uniquely identifies this component within its project.
     *
     * Implementation should attempt to produce human consumable identifiers.
     */
    Path getPath();

    /**
     * Returns a child of this component, with the given name.
     */
    ComponentSpecIdentifier child(String name);

 * should override {@code equals} as well, either providing your own implementation, or delegating
 * to the provided {@code standardEquals} method.
 *
 * <p>Each of the {@code standard} methods, where appropriate, use {@link Objects#equal} to test
 * equality for both keys and values. This may not be the desired behavior for map implementations
 * that use non-standard notions of key equality, such as the entry of a {@code SortedMap} whose

 *                    (shared packages)
 *                             |
 *                             |
 *                       implementation
 *          (SystemApplicationClassLoaderWorker, logging)
 *     (ActionExecutionWorker + worker action implementation)
 * </pre>
 */
public class ApplicationClassesInSystemClassLoaderWorkerImplementationFactory {
    private final ClassPathRegistry classPathRegistry;

     * A shared or exclusive file lock is held while fetching the value, depending on implementation.
     *
     * @return The value, or null if no value associated with the key.
     */
    @Override
    @Nullable
    V getIfPresent(K key);

    /**
     * Returns the value mapped to the given key, producing the value if not present.
     *