/*
 * Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source 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.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.server.distcache;

import java.io.IOException;
import java.io.InputStream;

import com.caucho.hessian.HessianUnshared;
import com.caucho.util.HashKey;
import com.caucho.util.Hex;
import com.caucho.vfs.StreamSource;

/**
 * Updates data for a cache
 */
@SuppressWarnings("serial")
@HessianUnshared
public class CacheUpdateWithSource extends MnodeUpdate implements java.io.Serializable
{
  private final StreamSource _source;

  /**
   * Hessian zero-arg constructor
   */
  protected CacheUpdateWithSource()
  {
    super(0, 0, 0);
    
    _source = null;
  }

  /**
   * Create a new CachePut message
   */
  public CacheUpdateWithSource(MnodeUpdate mnodeUpdate,
                               StreamSource source)
  {
    super(mnodeUpdate.getValueHash(),
          mnodeUpdate.getValueLength(),
          mnodeUpdate.getVersion(),
          mnodeUpdate,
          mnodeUpdate.getLeaseOwner());
    
    _source = source;
  }

  /**
   * Create a new CachePut message
   */
  public CacheUpdateWithSource(MnodeValue mnodeValue,
                               StreamSource source,
                               int leaseOwner)
  {
    super(mnodeValue.getValueHash(),
          mnodeValue.getValueLength(),
          mnodeValue.getVersion(),
          mnodeValue,
          leaseOwner);
    
    _source = source;
  }

  public CacheUpdateWithSource(long oldValueHash, long version)
  {
    super(oldValueHash, 0, version);
    
    _source = null;
  }

  /**
   * Returns the stream source
   */
  public StreamSource getStreamSource()
  {
    return _source;
  }

  /**
   * Returns the source stream.
   */
  public InputStream getInputStream()
    throws IOException
  {
    if (_source != null)
      return _source.getInputStream();
    else
      return null;
  }

  @Override
  public String toString()
  {
    return (getClass().getSimpleName()
        + "["
        + ",value=" + Long.toHexString(getValueHash())
        + ",flags=" + Long.toHexString(getFlags())
        + ",version=" + getVersion()
        + ",lease=" + getLeaseOwner()
        + ",source=" + _source
        + "]");
  }
}
