storetransaction.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 80 行

/*
 * Copyright (c) 1998-2008 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.db.store;

import com.caucho.log.Log;
import com.caucho.util.L10N;

import java.io.IOException;
import java.util.logging.Logger;
/**
 * Represents a single transaction.
 */
abstract public class StoreTransaction {
  private static final Logger log = Log.open(StoreTransaction.class);
  private static final L10N L = new L10N(StoreTransaction.class);

  /**
   * Returns a read block.
   */
  abstract public Block readBlock(Store store, long blockAddress)
    throws IOException;

  /**
   * Returns a modified block.
   */
  abstract public Block createWriteBlock(Block block)
    throws IOException;

  /**
   * Adds an updated block.
   */
  abstract public void addUpdateBlock(Block block)
    throws IOException;

  /**
   * Add an update fragment block.
   */
  public void addUpdateFragmentBlock(Block block)
    throws IOException
  {
    addUpdateBlock(block);
  }

  /**
   * Returns a modified block.
   */
  public Block createAutoCommitWriteBlock(Block block)
    throws IOException
  {
    return block;
  }
}