*/
    @Override
    public void close() {
        release();
    }

    /**
     *
     */
    public void release() {
        long usage = this.usageCount.decrementAndGet();
        if (log.isTraceEnabled()) {
            log.trace("Release session " + usage + " " + this);
        }

        if (usage == 0) {
            if (log.isDebugEnabled()) {

      delegateIndex = delegates.size();
    }

    @SuppressWarnings("Interruption") // We are propagating an interrupt from a caller.
    private void recordCompletion() {
      if (incompleteOutputCount.decrementAndGet() == 0 && wasCancelled) {
        for (ListenableFuture<? extends T> toCancel : inputFutures) {
          if (toCancel != null) {
            toCancel.cancel(shouldInterrupt);
          }
        }
      }