/** {@inheritDoc} */
  @Override
  public void autoFlushFrequency(long autoFlushFreq) {
    A.ensure(autoFlushFreq >= 0, "autoFlushFreq >= 0");

    long old = this.autoFlushFreq;

    if (autoFlushFreq != old) {
      this.autoFlushFreq = autoFlushFreq;

      if (autoFlushFreq != 0 && old == 0) flushQ.add(this);
      else if (autoFlushFreq == 0) flushQ.remove(this);
    }
  }
  /** {@inheritDoc} */
  @Override
  public R get(long timeout, TimeUnit unit) throws GridException {
    A.ensure(timeout >= 0, "timeout cannot be negative: " + timeout);
    A.notNull(unit, "unit");

    checkValid();

    try {
      long now = System.currentTimeMillis();

      long end = timeout == 0 ? Long.MAX_VALUE : now + MILLISECONDS.convert(timeout, unit);

      // Account for overflow.
      if (end < 0) end = Long.MAX_VALUE;

      synchronized (mux) {
        while (!done && !cancelled && now < end) {
          mux.wait(end - now);

          if (!done) now = System.currentTimeMillis();
        }

        if (done) {
          if (err != null) throw U.cast(err);

          return res;
        }

        if (cancelled) throw new GridFutureCancelledException("Future was cancelled: " + this);

        throw new GridFutureTimeoutException(
            "Timeout was reached before computation completed [duration="
                + duration()
                + "ms, timeout="
                + unit.toMillis(timeout)
                + "ms]");
      }
    } catch (InterruptedException e) {
      throw new GridInterruptedException(
          "Got interrupted while waiting for future to complete [duration="
              + duration()
              + "ms, timeout="
              + unit.toMillis(timeout)
              + "ms]",
          e);
    }
  }
  /** {@inheritDoc} */
  @Override
  public void perNodeBufferSize(int bufSize) {
    A.ensure(bufSize > 0, "bufSize > 0");

    this.bufSize = bufSize;
  }
  /**
   * Gets value at given index within internal list. Note that this method will iterate through the
   * list to get a value at the specified index.
   *
   * @param idx Index to get value at (must be non-negative and less than {@link #size()}).
   * @return Value at give index.
   */
  public V get(int idx) {
    A.ensure(idx >= 0 && idx < size(), "idx >= 0 && idx < size()");

    return vals.get(idx);
  }