com.caucho.db.io.StoreReadWrite Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2015 Caucho Technology -- all rights reserved
*
* This file is part of Baratine(TM)
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Baratine 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.
*
* Baratine 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 Baratine; 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.io;
import java.io.IOException;
/**
* Filesystem access for a random-access store.
*
* The store is designed around a single writer thread and multiple
* reader threads. When possible, it uses mmap.
*/
public interface StoreReadWrite
{
final static int FILE_SIZE_INCREMENT = 8 * 1024 * 1024;
/**
* Returns the file size.
*/
long getFileSize();
/**
* Returns the alignment size for mmaps.
*/
long getChunkSize();
long getMmapCloseTimeout();
void create()
throws IOException;
void init()
throws IOException;
/**
* Opens the underlying file to the database.
*/
InStore openRead(long offset, int size);
/**
* Opens the underlying file to the database.
*/
OutStore openWrite(long offset, int size);
// used in QA
void fsync();
void close();
}
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