if (minSize <= sendBufferSize) {
            RdmaMemoryRegion region = availableSendRegions.poll();
            if (region != null) {
                region.getBuffer().clear();
                return region;
            }
        }
        
        // Allocate new buffer
        ByteBuffer buffer = ByteBuffer.allocateDirect(Math.max(minSize, sendBufferSize));

    } finally {
      tearDown();
    }
  }

  @Override
  protected void tearDown() {
    tearDownStack.runTearDown();
  }

  /** Builds a {@link TearDownStack} that makes sure it's clear by the end of this test. */
  private TearDownStack buildTearDownStack() {
    TearDownStack result = new TearDownStack();
    tearDownStack.addTearDown(
        new TearDown() {

          @Override

    private int pageSize;

    /** The current page number. */
    private int currentPageNumber;

    /** The dictionary ID */
    public String id;

    /**
     * Clears all pagination data and resets to default values.
     */
    public void clear() {
        allRecordCount = 0;
        allPageCount = 0;
        existPrePage = false;
        existNextPage = false;
        pageSize = getDefaultPageSize();

      return standardHashCode();
    }

    @Override
    public boolean addAll(Collection<? extends T> collection) {
      return standardAddAll(collection);
    }

    @Override
    public void clear() {
      standardClear();
    }

    @Override
    public boolean contains(Object object) {
      return standardContains(object);
    }

    @Override

    void close_doesNothing() throws Exception {
        // Arrange
        SmbPipeOutputStream out = newStream();
        // constructor already calls handle.getPipe(); clear interactions to focus on close()
        clearInvocations(handle);

        // Act
        out.close();

        // Assert
        verifyNoInteractions(handle);
    }

    @Nested

    /** Search criteria: script type */
    public String scriptType;

    /** Search criteria: start time */
    public String startTime;

    /**
     * Clears all pagination data and search criteria.
     */
    public void clear() {
        allRecordCount = 0;
        allPageCount = 0;
        existPrePage = false;
        existNextPage = false;
        pageSize = getDefaultPageSize();

     * Deletes URL queue data and access result data, and clears the URL filter.
     * @param sessionId The session ID to clean up.
     */
    public void cleanup(final String sessionId) {
        // TODO transaction?
        urlQueueService.delete(sessionId);
        dataService.delete(sessionId);
        urlFilter.clear();
    }

    /**
     * Closes the crawler, releasing resources.

                serverThread.join(5000); // Wait up to 5 seconds
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }

        registrations.clear();
        log.info("Mock witness service stopped");
    }

    /**
     * Get the address the service is listening on
     *
     * @return the service address

  }

  /**
   * Atomically removes all of the elements from this queue. The queue will be empty after this call
   * returns.
   */
  @Override
  public void clear() {
    Monitor monitor = this.monitor;
    monitor.enter();
    try {
      q.clear();
    } finally {
      monitor.leave();
    }
  }

  /**
   * Returns an iterator over the elements in this queue. The iterator does not return the elements

    assertTrue(delegateFuture.isCancelled());

    delegateQueue.clear();

    future = service.scheduleAtFixedRate(runnable, 5, 5, MINUTES);
    future.cancel(true);
    assertTrue(future.isCancelled());
    delegateFuture = (ScheduledFuture<?>) delegateQueue.element();
    assertTrue(delegateFuture.isCancelled());

    delegateQueue.clear();

    future = service.scheduleWithFixedDelay(runnable, 5, 5, MINUTES);