import java.io.IOException;
import java.nio.file.Path;
import java.util.Collection;
import java.util.List;
import java.util.Optional;

public interface FileWatcherRegistry extends Closeable {

    boolean isWatchingAnyLocations();

    interface ChangeHandler {
        void handleChange(Type type, Path path);

        void stopWatchingAfterError();
    }

    enum Type {
        CREATED,
        MODIFIED,

            }
        }));
    }

    @Override
    public void afterBuildFinished() {
    }

    @Override
    public boolean isWatchingAnyLocations() {
        return false;
    }

     */
    void registerWatchableHierarchy(File rootDirectoryForWatching);

    /**
     * Returns if anything is being watched.
     */
    boolean isWatchingAnyLocations();

    /**
     * Called when the build is finished.
     *
     * This operation happens in the context of executing the build from the client's perspective.
     */

            closeUnderLock();
            return currentRoot.empty();
        }
    }

    @Override
    public boolean isWatchingAnyLocations() {
        FileWatcherRegistry watchRegistry = this.watchRegistry;
        if (watchRegistry != null) {
            return watchRegistry.isWatchingAnyLocations();
        }
        return false;
    }

            handler.stopWatchingAfterError();
        });
        thread.start();
        return thread;
    }

    @Override
    public boolean isWatchingAnyLocations() {
        return !fileWatcherUpdater.getWatchedFiles().isEmpty();
    }

    @Override
    public void registerWatchableHierarchy(File watchableHierarchy, SnapshotHierarchy root) {

                    return lastResult;
                } else if (!continuousBuildTriggerHandler.hasBeenTriggered() && !virtualFileSystem.isWatchingAnyLocations()) {
                    logger.println().withStyle(StyledTextOutput.Style.Failure).println("Exiting continuous build as Gradle does not watch any file system locations.");
                    return lastResult;

    def executorService = Executors.newCachedThreadPool()
    def fileSystemIsWatchingAnyLocations = true
    def virtualFileSystem = Stub(BuildLifecycleAwareVirtualFileSystem) {
        isWatchingAnyLocations() >> {
            fileSystemIsWatchingAnyLocations
        }
    }

    def executer = executer()

    private File file = new File('file').absoluteFile