/** Writes out all the rows to a new file without fragmentation. */
public void defrag() throws HsqlException {
if (cacheReadonly) {
return;
}
if (fileFreePosition == INITIAL_FREE_POS) {
return;
}
try {
boolean wasNio = dataFile.wasNio();
DataFileDefrag dfd = new DataFileDefrag(database, this, fileName);
dfd.process();
close(false);
Trace.printSystemOut("closed old cache");
// first attemp to delete
fa.removeElement(fileName);
if (wasNio) {
System.gc();
if (fa.isStreamElement(fileName)) {
fa.removeElement(fileName);
if (fa.isStreamElement(fileName)) {
fa.renameElement(fileName, fileName + ".old");
File oldfile = new File(fileName + ".old");
FileUtil.deleteOnExit(oldfile);
}
}
}
// [email protected] - change to file access api
fa.renameElement(fileName + ".new", fileName);
backup();
database
.getProperties()
.setProperty("hsqldb.cache_version", HsqlDatabaseProperties.VERSION_STRING_1_7_0);
database.getProperties().save();
initParams();
cache = new Cache(this);
open(cacheReadonly);
dfd.updateTableIndexRoots();
Trace.printSystemOut("opened cache");
} catch (Exception e) {
database.logger.appLog.logContext(e);
throw new HsqlException(e, Trace.getMessage(Trace.GENERAL_IO_ERROR), Trace.GENERAL_IO_ERROR);
/*
Trace.error(Trace.FILE_IO_ERROR, Trace.DataFileCache_defrag, new Object[] {
e, fileName
});
*/
}
}
/**
* Opens the *.data file for this cache, setting the variables that allow access to the particular
* database version of the *.data file.
*/
public void open(boolean readonly) throws HsqlException {
fileFreePosition = 0;
try {
boolean preexists = database.isFilesInJar();
long freesize = 0;
if (!preexists && fa.isStreamElement(fileName)) {
if (database.isStoredFileAccess()) {
preexists = true;
} else {
// discard "empty" databases
File f = new File(fileName);
preexists = f.length() > INITIAL_FREE_POS;
}
}
if (preexists) {
String version =
database.getProperties().getProperty(HsqlDatabaseProperties.hsqldb_cache_version);
boolean v17 = HsqlDatabaseProperties.VERSION_STRING_1_7_0.equals(version);
// for later versions
boolean v18 = HsqlDatabaseProperties.VERSION_STRING_1_8_0.equals(version);
if (!v17) {
throw Trace.error(Trace.WRONG_DATABASE_FILE_VERSION);
}
}
boolean isNio = database.getProperties().isPropertyTrue("hsqldb.nio_data_file");
int fileType = isNio ? ScaledRAFile.DATA_FILE_NIO : ScaledRAFile.DATA_FILE_RAF;
if (database.isFilesInJar()) {
fileType = ScaledRAFile.DATA_FILE_JAR;
}
// [email protected] - change to file access api
String cname = database.getURLProperties().getProperty("storage_class_name");
String skey = database.getURLProperties().getProperty("storage_key");
dataFile = ScaledRAFile.newScaledRAFile(fileName, readonly, fileType, cname, skey);
if (preexists) {
dataFile.seek(FLAGS_POS);
int flags = dataFile.readInt();
hasRowInfo = BitMap.isSet(flags, FLAG_ROWINFO);
dataFile.seek(LONG_EMPTY_SIZE);
freesize = dataFile.readLong();
dataFile.seek(LONG_FREE_POS_POS);
fileFreePosition = dataFile.readLong();
if (fileFreePosition < INITIAL_FREE_POS) {
fileFreePosition = INITIAL_FREE_POS;
}
} else {
fileFreePosition = INITIAL_FREE_POS;
}
resetBuffers();
fileModified = false;
freeBlocks = new DataFileBlockManager(FREE_BLOCKS_COUNT, cacheFileScale, freesize);
} catch (Exception e) {
database.logger.appLog.logContext(e);
close(false);
throw Trace.error(Trace.FILE_IO_ERROR, Trace.DataFileCache_open, new Object[] {e, fileName});
}
}