/*
 * Created on Feb 11, 2005
 * Created by Alon Rohter
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package org.gudy.azureus2.plugins.network;

import java.io.IOException;
import java.nio.ByteBuffer;


/**
 * Represents an underlying network transport.
 */
public interface Transport {

  /**
   * Read data from the transport into the given buffers.
   * NOTE: Works like ScatteringByteChannel.
   * @param buffers into which bytes are to be placed
   * @param array_offset offset within the buffer array of the first buffer into which bytes are to be placed
   * @param length maximum number of buffers to be accessed
   * @return number of bytes read
   * @throws IOException on read error
   */
  public long read( ByteBuffer[] buffers, int array_offset, int length ) throws IOException;
  
  
  /**
   * Write data to the transport from the given buffers.
   * NOTE: Works like GatheringByteChannel.
   * @param buffers from which bytes are to be retrieved
   * @param array_offset offset within the buffer array of the first buffer from which bytes are to be retrieved
   * @param length maximum number of buffers to be accessed
   * @return number of bytes written
   * @throws IOException on write error
   */
  public long write( ByteBuffer[] buffers, int array_offset, int length ) throws IOException;
  
  /**
   * @since 3.0.5.3
   */
  public void setFilter(TransportFilter filter) throws IOException;
}
