/* Copyright (c) 2001-2016, The HSQL Development Group
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*
* 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 the HSQL Development Group 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
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* 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;
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.persist;
import org.hsqldb.lib.
DoubleIntIndex;
/**
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.3
* @since 2.3.0
*/
public class
DataSpaceManagerSimple implements
DataSpaceManager {
DataFileCache cache;
TableSpaceManager defaultSpaceManager;
int
fileBlockSize =
DataSpaceManager.
fixedBlockSizeUnit;
long
totalFragmentSize;
int
spaceIdSequence =
tableIdFirst;
DoubleIntIndex lookup;
/**
* Used for default, readonly, Text and Session data files
*/
DataSpaceManagerSimple(
DataFileCache cache, boolean
isReadOnly) {
this.
cache =
cache;
if (
cache instanceof
DataFileCacheSession) {
defaultSpaceManager = new
TableSpaceManagerSimple(
cache);
} else if (
cache instanceof
TextCache) {
defaultSpaceManager = new
TableSpaceManagerSimple(
cache);
} else {
int
capacity =
cache.
database.
logger.
propMaxFreeBlocks;
defaultSpaceManager = new
TableSpaceManagerBlocks(this,
DataSpaceManager.
tableIdDefault,
fileBlockSize,
capacity,
cache.
getDataFileScale(), 0);
if (!
isReadOnly) {
initialiseSpaces();
cache.
spaceManagerPosition = 0;
}
}
totalFragmentSize =
cache.
lostSpaceSize;
}
public
TableSpaceManager getDefaultTableSpace() {
return
defaultSpaceManager;
}
public
TableSpaceManager getTableSpace(int
spaceId) {
if (
spaceId >=
spaceIdSequence) {
spaceIdSequence =
spaceId + 1;
}
return
defaultSpaceManager;
}
public int
getNewTableSpaceID() {
return
spaceIdSequence++;
}
public long
getFileBlocks(int
spaceId, int
blockCount) {
long
filePosition =
cache.
enlargeFileSpace((long)
blockCount
*
fileBlockSize);
return
filePosition;
}
public void
freeTableSpace(int
spaceId) {}
public void
freeTableSpace(int
spaceId,
DoubleIntIndex spaceList,
long
offset, long
limit, boolean
full) {
totalFragmentSize +=
spaceList.
getTotalValues()
*
cache.
getDataFileScale();
if (
full) {
if (
cache.
fileFreePosition ==
limit) {
cache.
writeLock.
lock();
try {
cache.
fileFreePosition =
offset;
} finally {
cache.
writeLock.
unlock();
}
} else {
totalFragmentSize +=
limit -
offset;
}
if (
spaceList.
size() != 0) {
lookup = new
DoubleIntIndex(
spaceList.
size(), true);
spaceList.
copyTo(
lookup);
spaceList.
clear();
}
} else {
spaceList.
compactLookupAsIntervals();
spaceList.
setValuesSearchTarget();
spaceList.
sort();
int
extra =
spaceList.
size() -
spaceList.
capacity() / 2;
if (
extra > 0) {
spaceList.
removeRange(0,
extra);
totalFragmentSize -=
spaceList.
getTotalValues()
*
cache.
getDataFileScale();
}
}
}
public long
getLostBlocksSize() {
return
totalFragmentSize +
defaultSpaceManager.
getLostBlocksSize();
}
public int
getFileBlockSize() {
return 1024 * 1024 *
cache.
getDataFileScale() / 16;
}
public boolean
isModified() {
return true;
}
public void
initialiseSpaces() {
long
currentSize =
cache.
getFileFreePos();
long
totalBlocks = (
currentSize +
fileBlockSize) /
fileBlockSize;
long
lastFreePosition =
cache.
enlargeFileSpace(
totalBlocks
*
fileBlockSize -
currentSize);
defaultSpaceManager.
initialiseFileBlock(
lookup,
lastFreePosition,
cache.
getFileFreePos());
if (
lookup != null) {
totalFragmentSize -=
lookup.
getTotalValues()
*
cache.
getDataFileScale();
lookup = null;
}
}
public void
reset() {
defaultSpaceManager.
reset();
}
public boolean
isMultiSpace() {
return false;
}
public int
getFileBlockItemCount() {
return 1024 * 64;
}
public
DirectoryBlockCachedObject[]
getDirectoryList() {
return new
DirectoryBlockCachedObject[0];
}
}