/* Copyright (c) 2001-2018, The HSQL Development Group
* 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 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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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.persist;
import org.hsqldb.
Database;
import org.hsqldb.error.
Error;
import org.hsqldb.error.
ErrorCode;
import org.hsqldb.lib.
FileUtil;
import org.hsqldb.lib.
Iterator;
/**
* A file-based row store for temporary CACHED table persistence.<p>
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.4
* @since 1.9.0
*/
public class
DataFileCacheSession extends
DataFileCache {
public
DataFileCacheSession(
Database db,
String baseFileName) {
super(
db,
baseFileName);
logEvents = false;
}
/**
* Initial external parameters are set here. The size if fixed.
*/
protected void
initParams(
Database database,
String baseFileName,
boolean
defrag) {
this.
dataFileName =
baseFileName + ".data.tmp";
this.
database =
database;
fa =
FileUtil.
getFileUtil();
dataFileScale = 64;
cachedRowPadding =
dataFileScale;
initialFreePos =
dataFileScale;
maxCacheRows = 2048;
maxCacheBytes =
maxCacheRows * 1024L;
maxDataFileSize = (long)
Integer.
MAX_VALUE *
dataFileScale;
}
/**
* Opens the *.data file for this cache.
*/
public void
open(boolean
readonly) {
try {
dataFile = new
RAFile(
database.
logger,
dataFileName, false, false,
false);
fileFreePosition =
initialFreePos;
initBuffers();
spaceManager = new
DataSpaceManagerSimple(this, false);
} catch (
Throwable t) {
database.
logger.
logWarningEvent("Failed to open Session RA file",
t);
release();
throw
Error.
error(
t,
ErrorCode.
FILE_IO_ERROR,
ErrorCode.
M_DataFileCache_open, new
Object[] {
t.
toString(),
dataFileName
});
}
}
protected void
setFileModified() {}
/**
* Parameter write is always false. The backing file is simply closed and
* deleted.
*/
public void
close() {
writeLock.
lock();
try {
clear();
if (
dataFile != null) {
dataFile.
close();
dataFile = null;
deleteFile(
database,
dataFileName);
}
} catch (
Throwable t) {
database.
logger.
logWarningEvent("Failed to close Session RA file",
t);
throw
Error.
error(
t,
ErrorCode.
FILE_IO_ERROR,
ErrorCode.
M_DataFileCache_close, new
Object[] {
t.
toString(),
dataFileName
});
} finally {
writeLock.
unlock();
}
}
public void
adjustStoreCount(int
adjust) {
writeLock.
lock();
try {
storeCount +=
adjust;
if (
storeCount == 0) {
clear();
}
} finally {
writeLock.
unlock();
}
}
protected void
clear() {
super.clear();
fileStartFreePosition =
fileFreePosition =
initialFreePos;
initBuffers();
}
}