appsocket.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

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********************************************************************************/
/*
 *  Created on Jan 30, 2006
 */
package rice.p2p.commonapi.appsocket;

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

/**
 * Interface for sending bulk data from the application. Mimics java's
 * non-blocking SocketChannel interface this should make it easier to implement
 * in any Java-based p2p overlay.
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author jeffh
 */
public interface AppSocket {
  /**
   * Reads a sequence of bytes from this channel into a subsequence of the given
   * buffers.
   *
   * @param dsts DESCRIBE THE PARAMETER
   * @param offset DESCRIBE THE PARAMETER
   * @param length DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  long read(ByteBuffer[] dsts, int offset, int length) throws IOException;

  /**
   * Writes a sequence of bytes to this channel from a subsequence of the given
   * buffers.
   *
   * @param srcs DESCRIBE THE PARAMETER
   * @param offset DESCRIBE THE PARAMETER
   * @param length DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   * @throws IOException
   */
  long write(ByteBuffer[] srcs, int offset, int length) throws IOException;

  /**
   * Must be called every time a Read/Write occurs to continue operation.
   *
   * @param wantToRead DESCRIBE THE PARAMETER
   * @param wantToWrite DESCRIBE THE PARAMETER
   * @param timeout DESCRIBE THE PARAMETER
   * @param receiver DESCRIBE THE PARAMETER
   * @receiver will have receiveSelectResult() called on it note that you must
   *      call select() each time receiveSelectResult() is called. This is so
   *      your application can properly handle flow control
   */
  void register(boolean wantToRead, boolean wantToWrite, int timeout, AppSocketReceiver receiver);

  /**
   * Disables the output stream for this socket. Used to properly close down a
   * socket used for bi-directional communication that can be initated by either
   * side.
   */
  void shutdownOutput();

  /**
   * Closes this socket.
   */
  void close();

}