/* Copyright (c) 2001-2011, 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
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* 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.
*/
package org.hsqldb.persist;
import org.hsqldb.Database;
import org.hsqldb.Row;
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 2.3.0
* @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 * 1024;
maxDataFileSize = (long) Integer.MAX_VALUE * dataFileScale;
}
/**
* Opens the *.data file for this cache.
*/
public void open(boolean readonly) {
try {
dataFile = new RAFile(database, dataFileName, false, false, false);
fileFreePosition = initialFreePos;
initBuffers();
spaceManager = new DataSpaceManagerSimple(this);
} 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;
fa.removeElement(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() {
Iterator it = cache.getIterator();
while (it.hasNext()) {
Row row = (Row) it.next();
row.setInMemory(false);
row.destroy();
}
cache.clear();
fileStartFreePosition = fileFreePosition = initialFreePos;
initBuffers();
}
}