/*
* Copyright (c) 2009 - 2011, Jan Stender, Bjoern Kolbeck, Mikael Hoegqvist,
* Felix Hupfeld, Felix Langner, Zuse Institute Berlin
*
* Licensed under the BSD License, see LICENSE file for details.
*
*/
package de.mxro.thrd.babudb05.lsmdb;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import de.mxro.thrd.babudb05.api.dev.BabuDBInternal;
import de.mxro.thrd.babudb05.api.dev.DatabaseInternal;
import de.mxro.thrd.babudb05.api.dev.DatabaseManagerInternal;
import de.mxro.thrd.babudb05.api.exception.BabuDBException;
import de.mxro.thrd.babudb05.api.exception.BabuDBException.ErrorCode;
import de.mxro.thrd.babudb05.api.index.ByteRangeComparator;
import de.mxro.thrd.xstreemfs.foundation.logging.Logging;
import static de.mxro.thrd.babudb05.BabuDBFactory.*;
/**
* <p>
* Operations to manipulate the DB-config-file.
* </p>
*
* @author flangner
* @since 09/02/2009
*/
public class DBConfig {
private final BabuDBInternal dbs;
private final File configFile;
private boolean conversionRequired;
private int dbFormatVer;
public DBConfig(BabuDBInternal dbs) throws BabuDBException {
this.dbs = dbs;
this.configFile = new File(dbs.getConfig().getBaseDir() + dbs.getConfig().getDbCfgFile());
load();
}
/**
* Loads the configuration and each database from disk and replaces the data
* of the existing DBs, while removing outdated one's.
*
* @throws BabuDBException
*/
public void reset() throws BabuDBException {
DatabaseManagerInternal dbman = dbs.getDatabaseManager();
assert (dbman != null) : "The DatabaseManager is not available!";
ObjectInputStream ois = null;
try {
List<Integer> ids = new LinkedList<Integer>();
if (configFile.exists()) {
ois = new ObjectInputStream(new FileInputStream(configFile));
final int dbFormatVer = ois.readInt();
if (dbFormatVer != BABUDB_DB_FORMAT_VERSION) {
throw new BabuDBException(ErrorCode.IO_ERROR, "on-disk format (version " + dbFormatVer
+ ") is incompatible with this BabuDB release " + "(uses on-disk format version "
+ BABUDB_DB_FORMAT_VERSION + ")");
}
final int numDB = ois.readInt();
dbman.setNextDBId(ois.readInt());
for (int i = 0; i < numDB; i++) {
Logging.logMessage(Logging.LEVEL_DEBUG, this, "loading DB...");
final String dbName = (String) ois.readObject();
final int dbId = ois.readInt();
final int numIndex = ois.readInt();
ByteRangeComparator[] comps = new ByteRangeComparator[numIndex];
for (int idx = 0; idx < numIndex; idx++) {
final String className = (String) ois.readObject();
ByteRangeComparator comp = dbman.getComparatorInstances().get(className);
if (comp == null) {
Class<?> clazz = Class.forName(className);
comp = (ByteRangeComparator) clazz.newInstance();
dbman.getComparatorInstances().put(className, comp);
}
assert (comp != null);
comps[idx] = comp;
}
ids.add(dbId);
DatabaseInternal db;
try {
// reset existing DBs
db = dbman.getDatabase(dbId);
db.setLSMDB(new LSMDatabase(dbName, dbId, dbs.getConfig().getBaseDir()
+ dbName + File.separatorChar, numIndex, true, comps,
dbs.getConfig().getCompression(),
dbs.getConfig().getMaxNumRecordsPerBlock(),
dbs.getConfig().getMaxBlockFileSize(),
dbs.getConfig().getDisableMMap(),
dbs.getConfig().getMMapLimit()));
} catch (BabuDBException e) {
db = new DatabaseImpl(dbs, new LSMDatabase(dbName, dbId,
dbs.getConfig().getBaseDir() + dbName + File.separatorChar,
numIndex, true, comps, dbs.getConfig().getCompression(),
dbs.getConfig().getMaxNumRecordsPerBlock(),
dbs.getConfig().getMaxBlockFileSize(),
dbs.getConfig().getDisableMMap(),
dbs.getConfig().getMMapLimit()));
dbman.putDatabase(db);
}
Logging.logMessage(Logging.LEVEL_INFO, this, "loaded DB %s" + " successfully. [LSN %s]",
dbName, db.getLSMDB().getOndiskLSN());
}
}
// delete remaining outdated DBs
Set<Integer> outdatedIds = dbman.getAllDatabaseIds();
outdatedIds.removeAll(ids);
if (outdatedIds.size() > 0) {
for (int id : outdatedIds) {
dbman.removeDatabaseById(id);
}
}
} catch (InstantiationException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR, "cannot instantiate comparator", ex);
} catch (IllegalAccessException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR, "cannot instantiate comparator", ex);
} catch (IOException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR,
"cannot load database config, check path and access rights", ex);
} catch (ClassNotFoundException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR,
"cannot load database config, config file might be corrupted", ex);
} catch (ClassCastException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR,
"cannot load database config, config file might be corrupted", ex);
} finally {
if (ois != null)
try {
ois.close();
} catch (IOException e) {
/* I don't care */
}
}
}
/**
* Loads the configuration and each database from disk.
*
* @throws BabuDBException
*/
public void load() throws BabuDBException {
DatabaseManagerInternal dbman = dbs.getDatabaseManager();
assert (dbman != null) : "The DatabaseManager is not available!";
ObjectInputStream ois = null;
try {
if (configFile.exists()) {
ois = new ObjectInputStream(new FileInputStream(configFile));
dbFormatVer = ois.readInt();
if (dbFormatVer != BABUDB_DB_FORMAT_VERSION)
conversionRequired = true;
final int numDB = ois.readInt();
dbman.setNextDBId(ois.readInt());
for (int i = 0; i < numDB; i++) {
Logging.logMessage(Logging.LEVEL_DEBUG, this, "loading DB...");
final String dbName = (String) ois.readObject();
final int dbId = ois.readInt();
final int numIndex = ois.readInt();
ByteRangeComparator[] comps = new ByteRangeComparator[numIndex];
for (int idx = 0; idx < numIndex; idx++) {
final String className = (String) ois.readObject();
ByteRangeComparator comp = dbman.getComparatorInstances().get(className);
if (comp == null) {
Class<?> clazz = Class.forName(className);
comp = (ByteRangeComparator) clazz.newInstance();
dbman.getComparatorInstances().put(className, comp);
}
assert (comp != null);
comps[idx] = comp;
}
if (!conversionRequired) {
DatabaseInternal db = new DatabaseImpl(this.dbs,
new LSMDatabase(dbName, dbId, this.dbs.getConfig().getBaseDir()
+ dbName + File.separatorChar, numIndex, true, comps, dbs.getConfig()
.getCompression(), this.dbs.getConfig().getMaxNumRecordsPerBlock(),
dbs.getConfig().getMaxBlockFileSize(), dbs.getConfig().getDisableMMap(),
dbs.getConfig().getMMapLimit()));
dbman.putDatabase(db);
Logging.logMessage(Logging.LEVEL_DEBUG, this, "loaded DB " + dbName
+ "(" + dbId + ") successfully.");
}
}
}
} catch (InstantiationException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR, "cannot instantiate comparator", ex);
} catch (IllegalAccessException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR, "cannot instantiate comparator", ex);
} catch (IOException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR,
"cannot load database config, check path and access rights", ex);
} catch (ClassNotFoundException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR,
"cannot load database config, config file might be corrupted", ex);
} catch (ClassCastException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR,
"cannot load database config, config file might be corrupted", ex);
} finally {
if (ois != null)
try {
ois.close();
} catch (IOException e) {
/* who cares? */
}
}
}
/**
* saves the current database config to disk
*
* @param filename
* path to the config file location
* @throws BabuDBException
*/
public void save(String filename) throws BabuDBException {
DatabaseManagerInternal dbman = dbs.getDatabaseManager();
synchronized (dbman.getDBModificationLock()) {
try {
File tempFile = new File(filename + ".in_progress");
FileOutputStream fos = new FileOutputStream(tempFile);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeInt(BABUDB_DB_FORMAT_VERSION);
oos.writeInt(dbman.getAllDatabaseIds().size());
oos.writeInt(dbman.getNextDBId());
for (int dbId : dbman.getAllDatabaseIds()) {
LSMDatabase db = dbman.getDatabase(dbId).getLSMDB();
oos.writeObject(db.getDatabaseName());
oos.writeInt(dbId);
oos.writeInt(db.getIndexCount());
String[] compClasses = db.getComparatorClassNames();
for (int i = 0; i < db.getIndexCount(); i++) {
oos.writeObject(compClasses[i]);
}
}
oos.flush();
fos.flush();
fos.getFD().sync();
oos.close();
File dbFile = new File(filename);
// try to rename the file
boolean success = tempFile.renameTo(dbFile);
if (!success) {
// on Windows machines, the target mustn't exist; thus, it
// is necessary to sacrifice atomicity and delete the
// previous file before
dbFile.delete();
tempFile.renameTo(dbFile);
}
} catch (IOException ex) {
throw new BabuDBException(ErrorCode.IO_ERROR, "unable to save database configuration", ex);
}
}
}
public void save() throws BabuDBException {
save(dbs.getConfig().getBaseDir() + dbs.getConfig().getDbCfgFile());
}
public boolean isConversionRequired() {
return conversionRequired;
}
public int getDBFormatVersion() {
return dbFormatVer;
}
}