package com.neocoretechs.bigsack;
/*
* Copyright (c) 1997,2003, NeoCoreTechs
* 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 NeoCoreTechs 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 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.
*
*/
/**
* Defines physical constants for tablespaces, buckets, etc
* @author Groff
*/
public interface DBPhysicalConstants {
//block header size is diff of DBLOCKSIZ - DATASIZE
/**
* The size of payload data in a block (page). Determined by BlockSize in properties file
* - the size of the header portion
*/
public static final short DATASIZE =
(short) (Props.toInt("BlockSize") - 28);
/**
* The total block (page) size. Determined by BlockSize in properties file
*/
public static final short DBLOCKSIZ = (short) Props.toInt("BlockSize");
/**
* The number of blocks (pages) per tablespace. Determined by Buckets in properties file
*/
public static final int DBUCKETS = Props.toInt("Buckets");
/**
* Number of tablespaces per DB. Cannot be easily altered.
*/
public static final int DTABLESPACES = 8; //Can't really mess with this
}