javaserializeddeserializer.java

pastry的java实现的2.0b版

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

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

- Neither  the name  of Rice  University (RICE) nor  the names  of its
contributors may be  used to endorse or promote  products derived from
this software without specific prior written permission.

This software is provided by RICE and the contributors on an "as is"
basis, without any representations or warranties of any kind, express
or implied including, but not limited to, representations or
warranties of non-infringement, merchantability or fitness for a
particular purpose. In no event shall RICE or contributors be liable
for any direct, indirect, incidental, special, exemplary, or
consequential damages (including, but not limited to, procurement of
substitute goods or services; loss of use, data, or profits; or
business interruption) however caused and on any theory of liability,
whether in contract, strict liability, or tort (including negligence
or otherwise) arising in any way out of the use of this software, even
if advised of the possibility of such damage.

********************************************************************************/
/*
 *  Created on Feb 21, 2006
 */
package rice.pastry.messaging;

import java.io.*;

import rice.environment.logging.Logger;
import rice.p2p.commonapi.Message;
import rice.p2p.commonapi.NodeHandle;
import rice.p2p.commonapi.rawserialization.*;
import rice.pastry.PastryNode;

/**
 * Handles "old" java serialized messages for programming convienience and
 * reverse compatability.
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author Jeff Hoye
 */
public class JavaSerializedDeserializer implements MessageDeserializer {

  /**
   * DESCRIBE THE FIELD
   */
  protected PastryNode pn;

  /**
   * Constructor for JavaSerializedDeserializer.
   *
   * @param pn DESCRIBE THE PARAMETER
   */
  public JavaSerializedDeserializer(PastryNode pn) {
    this.pn = pn;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param buf DESCRIBE THE PARAMETER
   * @param type DESCRIBE THE PARAMETER
   * @param priority DESCRIBE THE PARAMETER
   * @param sender DESCRIBE THE PARAMETER
   * @return DESCRIBE THE RETURN VALUE
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  public Message deserialize(InputBuffer buf, short type, byte priority, NodeHandle sender) throws IOException {
    if (type != 0) {
      throw new IllegalArgumentException("type must be zero, was " + type);
    }

    Object o = null;
    try {
      byte[] array = new byte[buf.bytesRemaining()];
      buf.read(array);

      ObjectInputStream ois = new PastryObjectInputStream(new ByteArrayInputStream(array), pn);

      o = ois.readObject();
      Message ret = (Message) o;

      return ret;
//    } catch (ClassCastException e) {
//      if (logger.level <= Logger.SEVERE) logger.log(
//          "PANIC: Serialized message was not a pastry message!");
//      throw new IOException("Message recieved " + o + " was not a pastry message - closing channel.");
    } catch (ClassNotFoundException e) {
//      if (logger.level <= Logger.SEVERE) logger.log(
//          "PANIC: Unknown class type in serialized message!");
      throw new RuntimeException("Unknown class type in message - closing channel.", e);
//    } catch (InvalidClassException e) {
//      if (logger.level <= Logger.SEVERE) logger.log(
//          "PANIC: Serialized message was an invalid class! " + e.getMessage());
//      throw new IOException("Invalid class in message - closing channel.");
//    } catch (IllegalStateException e) {
//      if (logger.level <= Logger.SEVERE) logger.log(
//          "PANIC: Serialized message caused an illegal state exception! " + e.getMessage());
//      throw new IOException("Illegal state from deserializing message - closing channel.");
////    } catch (NullPointerException e) {
////      if (logger.level <= Logger.SEVERE) logger.logException(
////          "PANIC: Serialized message caused a null pointer exception! " , e);
////
////      return null;
//    } catch (Exception e) {
//      if (logger.level <= Logger.SEVERE) logger.log(
//          "PANIC: Serialized message caused exception! " + e.getMessage());
//      throw new IOException("Exception from deserializing message - closing channel.");
    }
  }


}