public void getNextURLs(int max, List<WebURL> result) {
while (true) {
synchronized (mutex) {
if (isFinished) {
return;
}
try {
List<WebURL> curResults = workQueues.get(max);
workQueues.delete(curResults.size());
if (inProcessPages != null) {
for (WebURL curPage : curResults) {
inProcessPages.put(curPage);
}
}
result.addAll(curResults);
} catch (DatabaseException e) {
logger.error("Error while getting next urls: " + e.getMessage());
e.printStackTrace();
}
if (result.size() > 0) {
return;
}
}
try {
synchronized (waitingList) {
waitingList.wait();
}
} catch (InterruptedException ignored) {
// Do nothing
}
if (isFinished) {
return;
}
}
}
public void doHook() {
try {
EnvironmentImpl envImpl = DbInternal.getEnvironmentImpl(env);
SingleItemEntry<CheckpointStart> startEntry =
SingleItemEntry.create(LogEntryType.LOG_CKPT_START, new CheckpointStart(100, "test"));
long checkpointStart =
envImpl.getLogManager().log(startEntry, ReplicationContext.NO_REPLICATE);
CheckpointEnd ckptEnd =
new CheckpointEnd(
"test",
checkpointStart,
envImpl.getRootLsn(),
envImpl.getTxnManager().getFirstActiveLsn(),
envImpl.getNodeSequence().getLastLocalNodeId(),
envImpl.getNodeSequence().getLastReplicatedNodeId(),
envImpl.getDbTree().getLastLocalDbId(),
envImpl.getDbTree().getLastReplicatedDbId(),
envImpl.getTxnManager().getLastLocalTxnId(),
envImpl.getTxnManager().getLastReplicatedTxnId(),
100,
true /*cleanedFilesToDelete*/,
envImpl.getCleaner().getLogSummary());
SingleItemEntry<CheckpointEnd> endEntry =
SingleItemEntry.create(LogEntryType.LOG_CKPT_END, ckptEnd);
envImpl
.getLogManager()
.logForceFlush(
endEntry,
true, // fsyncRequired
ReplicationContext.NO_REPLICATE);
} catch (DatabaseException e) {
fail(e.getMessage());
}
}
public Frontier(Environment env, CrawlConfig config, DocIDServer docIdServer) {
super(config);
this.counters = new Counters(env, config);
this.docIdServer = docIdServer;
try {
workQueues = new WorkQueues(env, "PendingURLsDB", config.isResumableCrawling());
if (config.isResumableCrawling()) {
scheduledPages = counters.getValue(ReservedCounterNames.SCHEDULED_PAGES);
inProcessPages = new InProcessPagesDB(env);
long numPreviouslyInProcessPages = inProcessPages.getLength();
if (numPreviouslyInProcessPages > 0) {
logger.info("Rescheduling " + numPreviouslyInProcessPages + " URLs from previous crawl.");
scheduledPages -= numPreviouslyInProcessPages;
while (true) {
List<WebURL> urls = inProcessPages.get(100);
if (urls.size() == 0) {
break;
}
scheduleAll(urls);
inProcessPages.delete(urls.size());
}
}
} else {
inProcessPages = null;
scheduledPages = 0;
}
} catch (DatabaseException e) {
logger.error("Error while initializing the Frontier: " + e.getMessage());
workQueues = null;
}
}
public void close() {
try {
urlsDB.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
private void openEnvironment(File file) throws DatabaseInitException {
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setCachePercent(30);
envConfig.setAllowCreate(true);
envConfig.setTransactional(true);
envConfig.setTxnTimeout(10, TimeUnit.SECONDS);
envConfig.setLockTimeout(2000, TimeUnit.MILLISECONDS);
try {
environment = new Environment(file, envConfig);
transactionConfig = new TransactionConfig();
transactionConfig.setReadCommitted(true);
cursorConfig = new CursorConfig();
cursorConfig.setReadCommitted(true);
} catch (EnvironmentLockedException e) {
String message =
"Environment locked exception. Another process is using the same database, or the current user has no write access (database location: \""
+ file.getAbsolutePath()
+ "\")";
throw new DatabaseInitException(message);
} catch (DatabaseException e) {
String message = "A database initialisation error has occured (" + e.getMessage() + ")";
throw new DatabaseInitException(message);
}
}
public void remove(String csName) {
try {
m_env.removeDatabase(null, csName);
} catch (DatabaseException e) {
e.printStackTrace();
}
m_env = null;
}
/** Closes the database. */
@Override
public void close() {
try {
database.close();
} catch (DatabaseException e) {
LOGGER.error("Ignored: Could not close database: " + e.getMessage());
}
}
private static void attemptClose(Cursor cursor) {
try {
if (cursor != null) cursor.close();
} catch (DatabaseException e) {
logger.error("Error closing cursor.", e);
throw new PersistenceFailureException(e.getMessage(), e);
}
}
/**
* Method used by BdbFrontier during checkpointing.
*
* <p>The backing bdbje database has been marked deferred write so we save on writes to disk.
* Means no guarantees disk will have whats in memory unless a sync is called (Calling sync on the
* bdbje Environment is not sufficent).
*
* <p>Package access only because only Frontiers of this package would ever need access.
*
* @see <a href="http://www.sleepycat.com/jedocs/GettingStartedGuide/DB.html">Deferred Write
* Databases</a>
*/
void sync() {
if (this.pendingUrisDB == null) {
return;
}
try {
this.pendingUrisDB.sync();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
/* (non-Javadoc)
* @see de.tudarmstadt.ukp.dkpro.ir.util.berkeleydb.BerkeleyDbEnvironmentResource#close()
*/
public void close() {
if (environment != null) {
try {
environment.close();
} catch (DatabaseException e) {
// TODO use logger instead of out
e.printStackTrace();
}
}
}
protected void deleteItem(final WorkQueueFrontier frontier, final CrawlURI peekItem)
throws IOException {
try {
final BdbMultipleWorkQueues queues = ((BdbFrontier) frontier).getWorkQueues();
queues.delete(peekItem);
} catch (DatabaseException e) {
e.printStackTrace();
throw IoUtils.wrapAsIOException(e);
}
}
private static void closeEnv() {
System.out.println("Closing env and databases");
if (myDb != null) {
try {
myDb.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: myDb: " + e.toString());
e.printStackTrace();
}
}
if (myClassDb != null) {
try {
myClassDb.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: myClassDb: " + e.toString());
e.printStackTrace();
}
}
if (myEnv != null) {
try {
myEnv.close();
} catch (DatabaseException e) {
System.err.println("closeEnv: " + e.toString());
e.printStackTrace();
}
}
}
public static void main(String args[]) {
ExampleInventoryRead eir = new ExampleInventoryRead();
try {
eir.run(args);
} catch (DatabaseException dbe) {
System.err.println("ExampleInventoryRead: " + dbe.toString());
dbe.printStackTrace();
} finally {
myDbEnv.close();
}
System.out.println("All done.");
}
public BtreeFile createBtreeFile(String csName) // , boolean bCanSortMultiThreads)
{
// Now open, or create and open, the database
try {
Database bdb = m_env.openDatabase(null, csName, m_DbConfig);
BtreeFile btreeFile = new BtreeFile(bdb); // , bCanSortMultiThreads);
return btreeFile;
} catch (DatabaseException e) {
e.printStackTrace();
return null;
}
}
/**
* Set an attribute value for the given environment.
*
* @param targetEnv The target JE environment. May be null if the environment is not open.
* @param attribute name/value pair
*/
public void setAttribute(Environment targetEnv, Attribute attribute)
throws AttributeNotFoundException, InvalidAttributeValueException {
if (attribute == null) {
throw new AttributeNotFoundException("Attribute cannot be null");
}
/* Sanity check parameters. */
String name = attribute.getName();
Object value = attribute.getValue();
if (name == null) {
throw new AttributeNotFoundException("Attribute name cannot be null");
}
if (value == null) {
throw new InvalidAttributeValueException(
"Attribute value for attribute " + name + " cannot be null");
}
try {
if (name.equals(ATT_SET_READ_ONLY)) {
openConfig.setReadOnly(((Boolean) value).booleanValue());
} else if (name.equals(ATT_SET_TRANSACTIONAL)) {
openConfig.setTransactional(((Boolean) value).booleanValue());
} else if (name.equals(ATT_SET_SERIALIZABLE)) {
openConfig.setTxnSerializableIsolation(((Boolean) value).booleanValue());
} else {
/* Set the specified attribute if the environment is open. */
if (targetEnv != null) {
EnvironmentMutableConfig config = targetEnv.getMutableConfig();
if (name.equals(ATT_CACHE_SIZE)) {
config.setCacheSize(((Long) value).longValue());
targetEnv.setMutableConfig(config);
} else if (name.equals(ATT_CACHE_PERCENT)) {
config.setCachePercent(((Integer) value).intValue());
targetEnv.setMutableConfig(config);
} else {
throw new AttributeNotFoundException("attribute " + name + " is not valid.");
}
} else {
throw new AttributeNotFoundException("attribute " + name + " is not valid.");
}
}
} catch (NumberFormatException e) {
throw new InvalidAttributeValueException("attribute name=" + name);
} catch (DatabaseException e) {
throw new InvalidAttributeValueException("attribute name=" + name + e.getMessage());
}
}
public void sync() {
if (resumable) {
return;
}
if (urlsDB == null) {
return;
}
try {
urlsDB.sync();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
public static StateStore.Factory deserialize(Element store) throws XMLParseException {
String type = store.getAttribute("type");
if (type.compareToIgnoreCase("hash") == 0) {
return HashTableStore.Factory.deserialize(store);
} else if (type.compareToIgnoreCase("bdb") == 0) {
try {
return BerkeleyDBStore.Factory.deserialize(store);
} catch (DatabaseException e) {
throw new XMLParseException(e.getMessage(), e.getCause());
}
}
throw new XMLParseException("Unrecognized state store type \'" + type + "\'", store);
}
public static void main(String[] args) {
Environment env = null;
Database db = null;
EnvironmentConfig envconfig = new EnvironmentConfig();
envconfig.setAllowCreate(true);
try {
env = new Environment(new File("D://bdb"), envconfig);
DatabaseConfig dbconfig = new DatabaseConfig();
dbconfig.setAllowCreate(true);
db = env.openDatabase(null, "dbac.db", dbconfig);
String key = "mykey";
DatabaseEntry thekey = new DatabaseEntry();
thekey.setData(key.getBytes("utf-8"));
Long value = new Long(123456);
DatabaseEntry thevalue = new DatabaseEntry();
EntryBinding myBinging = TupleBinding.getPrimitiveBinding(Long.class);
myBinging.objectToEntry(value, thevalue);
// LongBinding myLongBinging=(LongBinding)TupleBinding.getPrimitiveBinding(Long.class);
// myLongBinging.objectToEntry(value, thevalue);
db.put(null, thekey, thevalue);
DatabaseEntry valueEntry = new DatabaseEntry();
OperationStatus status = db.get(null, thekey, valueEntry, LockMode.DEFAULT);
if (status == OperationStatus.SUCCESS) {
// Long number=myLongBinging.entryToObject(valueEntry);
Long number = (Long) myBinging.entryToObject(valueEntry);
System.out.println(env.getDatabaseNames());
System.out.println(number);
}
} catch (EnvironmentLockedException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (db != null) {
try {
db.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
if (env != null) {
try {
env.cleanLog();
env.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
}
}
}
/**
* Invoke an operation for the given environment.
*
* @param targetEnv The target JE environment. May be null if the environment is not open.
* @param actionName operation name.
* @param params operation parameters. May be null.
* @param signature operation signature. May be null.
* @return the operation result
*/
public Object invoke(
Environment targetEnv, String actionName, Object[] params, String[] signature)
throws MBeanException {
/* Sanity checking. */
if (actionName == null) {
throw new IllegalArgumentException("actionName cannot be null");
}
try {
if (targetEnv != null) {
if (actionName.equals(OP_CLEAN)) {
int numFiles = targetEnv.cleanLog();
return new Integer(numFiles);
} else if (actionName.equals(OP_EVICT)) {
targetEnv.evictMemory();
return null;
} else if (actionName.equals(OP_CHECKPOINT)) {
CheckpointConfig config = new CheckpointConfig();
if ((params != null) && (params.length > 0)) {
Boolean force = (Boolean) params[0];
config.setForce(force.booleanValue());
}
targetEnv.checkpoint(config);
return null;
} else if (actionName.equals(OP_SYNC)) {
targetEnv.sync();
return null;
} else if (actionName.equals(OP_ENV_STAT)) {
return targetEnv.getStats(getStatsConfig(params));
} else if (actionName.equals(OP_LOCK_STAT)) {
return targetEnv.getLockStats(getStatsConfig(params));
} else if (actionName.equals(OP_TXN_STAT)) {
return targetEnv.getTransactionStats(getStatsConfig(params));
} else if (actionName.equals(OP_DB_NAMES)) {
return targetEnv.getDatabaseNames();
} else if (actionName.equals(OP_DB_STAT)) {
return getDatabaseStats(targetEnv, params);
}
}
return new IllegalArgumentException("actionName: " + actionName + " is not valid");
} catch (DatabaseException e) {
/*
* Add both the message and the exception for easiest
* deciphering of the problem. Sometimes the original exception
* stacktrace gets hidden in server logs.
*/
throw new MBeanException(e, e.getMessage());
}
}
/** {@inheritDoc} */
@Override()
public void finalizeBackend() {
// Deregister as a change listener.
cfg.removeLocalDBChangeListener(this);
// Deregister our base DNs.
for (DN dn : rootContainer.getBaseDNs()) {
try {
DirectoryServer.deregisterBaseDN(dn);
} catch (Exception e) {
if (debugEnabled()) {
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
}
}
DirectoryServer.deregisterMonitorProvider(rootContainerMonitor);
DirectoryServer.deregisterMonitorProvider(diskMonitor);
// We presume the server will prevent more operations coming into this
// backend, but there may be existing operations already in the
// backend. We need to wait for them to finish.
waitUntilQuiescent();
// Close the database.
try {
rootContainer.close();
rootContainer = null;
} catch (DatabaseException e) {
if (debugEnabled()) {
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
Message message = ERR_JEB_DATABASE_EXCEPTION.get(e.getMessage());
logError(message);
}
// Checksum this db environment and register its offline state id/checksum.
DirectoryServer.registerOfflineBackendStateID(this.getBackendID(), checksumDbEnv());
// Deregister the alert generator.
DirectoryServer.deregisterAlertGenerator(this);
// Make sure the thread counts are zero for next initialization.
threadTotalCount.set(0);
threadWriteCount.set(0);
// Log an informational message.
Message message = NOTE_BACKEND_OFFLINE.get(cfg.getBackendId());
logError(message);
}
private RootContainer initializeRootContainer(EnvironmentConfig envConfig)
throws ConfigException, InitializationException {
// Open the database environment
try {
RootContainer rc = new RootContainer(this, cfg);
rc.open(envConfig);
return rc;
} catch (DatabaseException e) {
if (debugEnabled()) {
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
Message message = ERR_JEB_OPEN_ENV_FAIL.get(e.getMessage());
throw new InitializationException(message, e);
}
}
public Groundhog getGroundhog(String groundhogName) {
Groundhog groundhog = null;
File file = new File(baseDirectoryPath + groundhogName);
if (file.isDirectory()) {
try {
groundhog = new Groundhog(file, defaultCacheSize);
return groundhog;
} catch (DatabaseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return groundhog;
}
// Close the environment
public boolean close() {
if (m_env != null) {
try {
// StatsConfig config = new StatsConfig();
// config.setClear(true);
// System.err.println(m_env.getStats(config));
// Finally, close the environment.
m_env.close();
} catch (DatabaseException dbe) {
System.err.println("Error closing MyDbEnv: " + dbe.toString());
return false;
}
}
return true;
}
public void close() {
if (myEnv != null) {
try {
Iterator<Entry<String, Database>> it = myDbHashHandle.entrySet().iterator();
while (it.hasNext()) {
Database thisDb = it.next().getValue();
if (thisDb != null) {
thisDb.close();
}
}
myEnv.close();
} catch (DatabaseException dbe) {
System.err.println("Error closing Envorionment" + dbe.toString());
}
}
}
/** Main */
public static void main(String argv[]) {
if (argv.length < 2) {
usage();
return;
}
File envHomeDirectory = new File(argv[0]);
boolean doInsertArg = false;
if (argv[1].equalsIgnoreCase("insert")) {
doInsertArg = true;
} else if (argv[1].equalsIgnoreCase("retrieve")) {
doInsertArg = false;
} else {
usage();
}
int startOffset = 0;
int numRecordsVal = 0;
if (doInsertArg) {
if (argv.length > 2) {
numRecordsVal = Integer.parseInt(argv[2]);
} else {
usage();
return;
}
if (argv.length > 3) {
startOffset = Integer.parseInt(argv[3]);
}
}
try {
BindingExample app =
new BindingExample(numRecordsVal, doInsertArg, envHomeDirectory, startOffset);
app.run();
} catch (DatabaseException e) {
e.printStackTrace();
System.exit(EXIT_FAILURE);
}
System.exit(EXIT_SUCCESS);
}
/**
* Tests that an exception is thrown when a log header is read with a newer version than the
* current version. The maxversion.jdb log file is loaded as a resource by this test and written
* as a regular log file. When the environment is opened, we expect a LogException.
*/
public void testGreaterVersionNotAllowed() throws DatabaseException, IOException {
TestUtils.loadLog(getClass(), Utils.MAX_VERSION_NAME, envHome);
EnvironmentConfig envConfig = TestUtils.initEnvConfig();
envConfig.setAllowCreate(false);
envConfig.setTransactional(true);
try {
Environment env = new Environment(envHome, envConfig);
try {
env.close();
} catch (Exception ignore) {
}
} catch (DatabaseException e) {
if (e.getCause() instanceof LogException) {
/* Got LogException as expected. */
return;
}
}
fail("Expected LogException");
}
/**
* Creates a customized DirectoryException from the DatabaseException thrown by JE backend.
*
* @param e The DatabaseException to be converted.
* @return DirectoryException created from exception.
*/
DirectoryException createDirectoryException(DatabaseException e) {
ResultCode resultCode = DirectoryServer.getServerErrorResultCode();
Message message;
if ((e instanceof EnvironmentFailureException) && !rootContainer.isValid()) {
message = NOTE_BACKEND_ENVIRONMENT_UNUSABLE.get(getBackendID());
logError(message);
DirectoryServer.sendAlertNotification(
DirectoryServer.getInstance(), ALERT_TYPE_BACKEND_ENVIRONMENT_UNUSABLE, message);
}
String jeMessage = e.getMessage();
if (jeMessage == null) {
jeMessage = stackTraceToSingleLineString(e);
}
message = ERR_JEB_DATABASE_EXCEPTION.get(jeMessage);
return new DirectoryException(resultCode, message, e);
}
private void doClose(boolean doCheckpoint) throws DatabaseException {
StringBuffer errors = new StringBuffer();
try {
// refined trace Tracer.trace(Level.FINE, this, "Close of
// environment " + envHome + " started");
try {
envState.checkState(DbEnvState.VALID_FOR_CLOSE, DbEnvState.CLOSED);
} catch (DatabaseException DBE) {
throw DBE;
}
/*
* Begin shutdown of the deamons before checkpointing. Cleaning
* during the checkpoint is wasted and slows down the checkpoint.
*/
requestShutdownDaemons();
/* Checkpoint to bound recovery time. */
if (doCheckpoint
&& !isReadOnly
&& (envState != DbEnvState.INVALID)
&& logManager.getLastLsnAtRecovery() != fileManager.getLastUsedLsn()) {
/*
* Force a checkpoint. Don't allow deltas (minimize recovery
* time) because they cause inefficiencies for two reasons: (1)
* recovering BINDeltas causes extra random I/O in order to
* reconstitute BINS, which can greatly increase recovery time,
* and (2) logging deltas during close causes redundant logging
* by the full checkpoint after recovery.
*/
CheckpointConfig ckptConfig = new CheckpointConfig();
ckptConfig.setForce(true);
ckptConfig.setMinimizeRecoveryTime(true);
try {
invokeCheckpoint(
ckptConfig,
false, // flushAll
"close");
} catch (DatabaseException IE) {
errors.append("\nException performing checkpoint: ");
errors.append(IE.toString()).append("\n");
}
}
try {
shutdownDaemons();
} catch (InterruptedException IE) {
errors.append("\nException shutting down daemon threads: ");
errors.append(IE.toString()).append("\n");
}
/* Flush log. */
// refined trace Tracer.trace(Level.FINE, this, "Env " + envHome + "
// daemons shutdown");
try {
logManager.flush();
} catch (DatabaseException DBE) {
errors.append("\nException flushing log manager: ");
errors.append(DBE.toString()).append("\n");
}
try {
fileManager.clear();
} catch (IOException IOE) {
errors.append("\nException clearing file manager: ");
errors.append(IOE.toString()).append("\n");
} catch (DatabaseException DBE) {
errors.append("\nException clearing file manager: ");
errors.append(DBE.toString()).append("\n");
}
try {
fileManager.close();
} catch (IOException IOE) {
errors.append("\nException clearing file manager: ");
errors.append(IOE.toString()).append("\n");
} catch (DatabaseException DBE) {
errors.append("\nException clearing file manager: ");
errors.append(DBE.toString()).append("\n");
}
try {
inMemoryINs.clear();
} catch (DatabaseException DBE) {
errors.append("\nException closing file manager: ");
errors.append(DBE.toString()).append("\n");
}
hook_afterDoClose(errors);
} finally {
envState = DbEnvState.CLOSED;
}
if (errors.length() > 0 && savedInvalidatingException == null) {
/* Don't whine again if we've already whined. */
throw new RunRecoveryException(this, errors.toString());
}
}
/** {@inheritDoc} */
@Override()
public void initializeBackend() throws ConfigException, InitializationException {
// Checksum this db environment and register its offline state id/checksum.
DirectoryServer.registerOfflineBackendStateID(this.getBackendID(), checksumDbEnv());
if (rootContainer == null) {
EnvironmentConfig envConfig = ConfigurableEnvironment.parseConfigEntry(cfg);
rootContainer = initializeRootContainer(envConfig);
}
// Preload the database cache.
rootContainer.preload(cfg.getPreloadTimeLimit());
try {
// Log an informational message about the number of entries.
Message message =
NOTE_JEB_BACKEND_STARTED.get(cfg.getBackendId(), rootContainer.getEntryCount());
logError(message);
} catch (DatabaseException databaseException) {
if (debugEnabled()) {
TRACER.debugCaught(DebugLogLevel.ERROR, databaseException);
}
Message message = WARN_JEB_GET_ENTRY_COUNT_FAILED.get(databaseException.getMessage());
throw new InitializationException(message, databaseException);
}
for (DN dn : cfg.getBaseDN()) {
try {
DirectoryServer.registerBaseDN(dn, this, false);
} catch (Exception e) {
if (debugEnabled()) {
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
Message message =
ERR_BACKEND_CANNOT_REGISTER_BASEDN.get(String.valueOf(dn), String.valueOf(e));
throw new InitializationException(message, e);
}
}
// Register a monitor provider for the environment.
rootContainerMonitor = rootContainer.getMonitorProvider();
DirectoryServer.registerMonitorProvider(rootContainerMonitor);
// Register as disk space monitor handler
File parentDirectory = getFileForPath(cfg.getDBDirectory());
File backendDirectory = new File(parentDirectory, cfg.getBackendId());
diskMonitor =
new DiskSpaceMonitor(
getBackendID() + " backend",
backendDirectory,
cfg.getDiskLowThreshold(),
cfg.getDiskFullThreshold(),
5,
TimeUnit.SECONDS,
this);
diskMonitor.initializeMonitorProvider(null);
DirectoryServer.registerMonitorProvider(diskMonitor);
// Register as an AlertGenerator.
DirectoryServer.registerAlertGenerator(this);
// Register this backend as a change listener.
cfg.addLocalDBChangeListener(this);
}