/** {@inheritDoc} */
  @SuppressWarnings({"unchecked"})
  @Override
  public void listenAsync(@Nullable final GridInClosure<? super GridFuture<R>> lsnr) {
    if (lsnr != null) {
      checkValid();

      boolean done;

      synchronized (mux) {
        done = this.done;

        if (!done) lsnrs.add(lsnr);
      }

      if (done) {
        try {
          if (syncNotify) notifyListener(lsnr);
          else
            ctx.closure()
                .runLocalSafe(
                    new GPR() {
                      @Override
                      public void run() {
                        notifyListener(lsnr);
                      }
                    },
                    true);
        } catch (IllegalStateException ignore) {
          U.warn(
              null,
              "Future notification will not proceed because grid is stopped: " + ctx.gridName());
        }
      }
    }
  }
  /** @param ctx Kernal context. */
  public GridFutureAdapter(GridKernalContext ctx) {
    assert ctx != null;

    this.ctx = ctx;

    log = ctx.log(getClass());
  }
  /** Notifies all registered listeners. */
  private void notifyListeners() {
    final Collection<GridInClosure<? super GridFuture<R>>> tmp;

    synchronized (mux) {
      tmp = new ArrayList<GridInClosure<? super GridFuture<R>>>(lsnrs);
    }

    boolean concurNotify = this.concurNotify;
    boolean syncNotify = this.syncNotify;

    if (concurNotify) {
      for (final GridInClosure<? super GridFuture<R>> lsnr : tmp)
        ctx.closure()
            .runLocalSafe(
                new GPR() {
                  @Override
                  public void run() {
                    notifyListener(lsnr);
                  }
                },
                true);
    } else {
      // Always notify in the thread different from start thread.
      if (Thread.currentThread() == thread && !syncNotify) {
        ctx.closure()
            .runLocalSafe(
                new GPR() {
                  @Override
                  public void run() {
                    // Since concurrent notifications are off, we notify
                    // all listeners in one thread.
                    for (GridInClosure<? super GridFuture<R>> lsnr : tmp) notifyListener(lsnr);
                  }
                },
                true);
      } else {
        for (GridInClosure<? super GridFuture<R>> lsnr : tmp) notifyListener(lsnr);
      }
    }
  }
  /**
   * Notifies single listener.
   *
   * @param lsnr Listener.
   */
  private void notifyListener(GridInClosure<? super GridFuture<R>> lsnr) {
    assert lsnr != null;

    try {
      lsnr.apply(this);
    } catch (IllegalStateException ignore) {
      U.warn(
          null,
          "Failed to notify listener (grid is stopped) [grid="
              + ctx.gridName()
              + ", lsnr="
              + lsnr
              + ']');
    } catch (RuntimeException e) {
      U.error(log, "Failed to notify listener: " + lsnr, e);

      throw e;
    } catch (Error e) {
      U.error(log, "Failed to notify listener: " + lsnr, e);

      throw e;
    }
  }