org.hsqldb.persist.DataFileCacheSession Maven / Gradle / Ivy
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/* Copyright (c) 2001-2020, The HSQL Development Group
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*
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*
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package org.hsqldb.persist;
import org.hsqldb.Database;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.lib.FileUtil;
/**
* A file-based row store for temporary CACHED table persistence.
*
* @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;
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 = dataFileScale;
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;
deleteDataFile();
}
} 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 = dataFileScale;
initBuffers();
}
}