public DefaultExecHandleBuilder(PathToFileResolver fileResolver, Executor executor) {
        this(fileResolver, executor, new DefaultBuildCancellationToken());
    }

    public DefaultExecHandleBuilder(PathToFileResolver fileResolver, Executor executor, BuildCancellationToken buildCancellationToken) {
        super(fileResolver, executor, buildCancellationToken);
    }

    @Override

   *
   * @param listener the listener to run when the computation is complete
   * @param executor the executor to run the listener in
   * @throws RejectedExecutionException if we tried to execute the listener immediately but the
   *     executor rejected it.
   */
  void addListener(Runnable listener, Executor executor);

   *
   * @param listener the listener to run when the computation is complete
   * @param executor the executor to run the listener in
   * @throws RejectedExecutionException if we tried to execute the listener immediately but the
   *     executor rejected it.
   */
  void addListener(Runnable listener, Executor executor);

    }
  }

  private static final class Listener {
    final Runnable command;
    final Executor executor;

    Listener(Runnable command, Executor executor) {
      this.command = checkNotNull(command);
      this.executor = checkNotNull(executor);
    }

    void execute() {
      try {
        executor.execute(command);
      } catch (RuntimeException e) {
        log.log(
            Level.SEVERE,

	r()
}

type Executor interface {
	ExecuteUnsafe(runnable Runnable)
}

type Promise[T any] interface {
	Future() Future[T]
	Success(value T) bool
	Failure(err error) bool
	IsCompleted() bool
	Complete(result Try[T]) bool
}

type Future[T any] interface {
	OnFailure(cb func(err error), ctx ...Executor)
	OnSuccess(cb func(success T), ctx ...Executor)
	Foreach(f func(v T), ctx ...Executor)

  public void addListener(Runnable listener, Executor executor) {
    checkNotNull(listener, "Runnable was null.");
    checkNotNull(executor, "Executor was null.");
    try {
      executor.execute(listener);
    } catch (Exception e) { // sneaky checked exception
      // ListenableFuture's contract is that it will not throw unchecked exceptions, so log the bad
      // runnable and/or executor and swallow it.
      log.get()
          .log(

import com.google.common.annotations.GwtCompatible;
import java.util.concurrent.Executor;

/**
 * An {@link Executor} that runs each task in the thread that invokes {@link Executor#execute
 * execute}.
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
enum DirectExecutor implements Executor {
  INSTANCE;

  @Override
  public void execute(Runnable command) {
    command.run();
  }

import com.google.common.annotations.GwtCompatible;
import java.util.concurrent.Executor;

/**
 * An {@link Executor} that runs each task in the thread that invokes {@link Executor#execute
 * execute}.
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
enum DirectExecutor implements Executor {
  INSTANCE;

  @Override
  public void execute(Runnable command) {
    command.run();
  }

    private final InternalParameterAcceptingConnection executor;

    ParameterizedActionRunner(InternalParameterAcceptingConnection executor, CancellationExceptionTransformer exceptionTransformer, VersionDetails versionDetails) {
        super(null, exceptionTransformer, versionDetails);
        this.executor = executor;
    }

    @Override

    private final InternalCancellableConnection executor;
    private final CancellationExceptionTransformer exceptionTransformer;
    private final VersionDetails versionDetails;

    CancellableActionRunner(InternalCancellableConnection executor, CancellationExceptionTransformer exceptionTransformer, VersionDetails versionDetails) {
        this.executor = executor;
        this.exceptionTransformer = exceptionTransformer;