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JDBC Driver for the Firebird RDBMS
/*
* Firebird Open Source JavaEE Connector - JDBC Driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a source control history command.
*
* All rights reserved.
*/
package org.firebirdsql.gds.ng;
import org.firebirdsql.gds.BlobParameterBuffer;
import org.firebirdsql.gds.ISCConstants;
import org.firebirdsql.gds.impl.BlobParameterBufferImp;
import org.firebirdsql.gds.impl.TransactionParameterBufferImpl;
import org.firebirdsql.gds.ng.fields.RowDescriptor;
import org.firebirdsql.gds.ng.listeners.DatabaseListener;
import org.firebirdsql.gds.ng.listeners.DatabaseListenerDispatcher;
import org.firebirdsql.gds.ng.listeners.TransactionListener;
import org.firebirdsql.logging.Logger;
import org.firebirdsql.logging.LoggerFactory;
import java.nio.charset.StandardCharsets;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import static org.firebirdsql.gds.ISCConstants.*;
import static org.firebirdsql.gds.VaxEncoding.iscVaxInteger;
import static org.firebirdsql.gds.VaxEncoding.iscVaxInteger2;
/**
* Abstract implementation of {@link org.firebirdsql.gds.ng.FbDatabase} with behavior common to the various
* implementations.
*
* @author Mark Rotteveel
* @since 3.0
*/
public abstract class AbstractFbDatabase>
extends AbstractFbAttachment implements FbDatabase, TransactionListener {
private static final Logger log = LoggerFactory.getLogger(AbstractFbDatabase.class);
/**
* Info-request block for database information.
*
* Must match with processing in {@link org.firebirdsql.gds.ng.AbstractFbDatabase.DatabaseInformationProcessor}.
*
*/
// @formatter:off
private static final byte[] DESCRIBE_DATABASE_INFO_BLOCK = new byte[]{
isc_info_db_sql_dialect,
isc_info_firebird_version,
isc_info_ods_version,
isc_info_ods_minor_version,
isc_info_end };
// @formatter:on
private final DatabaseListenerDispatcher databaseListenerDispatcher = new DatabaseListenerDispatcher();
private final Set activeTransactions = Collections.synchronizedSet(new HashSet());
private final WarningMessageCallback warningCallback = new WarningMessageCallback() {
@Override
public void processWarning(SQLWarning warning) {
databaseListenerDispatcher.warningReceived(AbstractFbDatabase.this, warning);
}
};
private final RowDescriptor emptyRowDescriptor;
private short databaseDialect;
private int odsMajor;
private int odsMinor;
protected AbstractFbDatabase(T connection, DatatypeCoder datatypeCoder) {
super(connection, datatypeCoder);
emptyRowDescriptor = RowDescriptor.empty(datatypeCoder);
}
/**
* @return The warning callback for this database.
*/
public final WarningMessageCallback getDatabaseWarningCallback() {
return warningCallback;
}
/**
* @return Number of active (not prepared or committed/rolled back) transactions
*/
public final int getActiveTransactionCount() {
return activeTransactions.size();
}
/**
* Called when a transaction is added by the database.
*
* Only this {@link org.firebirdsql.gds.ng.AbstractFbDatabase} instance should call this method.
*
*/
protected final void transactionAdded(FbTransaction transaction) {
synchronized (activeTransactions) {
if (transaction.getState() == TransactionState.ACTIVE) {
activeTransactions.add(transaction);
}
transaction.addTransactionListener(this);
transaction.addExceptionListener(exceptionListenerDispatcher);
}
}
@Override
public final short getConnectionDialect() {
return connection.getAttachProperties().getConnectionDialect();
}
@Override
public final short getDatabaseDialect() {
return databaseDialect;
}
/**
* Sets the dialect of the database.
*
* This method should only be called by this instance.
*
*
* @param dialect
* Dialect of the database/connection
*/
protected final void setDatabaseDialect(short dialect) {
this.databaseDialect = dialect;
}
@Override
public final void addDatabaseListener(DatabaseListener listener) {
databaseListenerDispatcher.addListener(listener);
}
@Override
public final void addWeakDatabaseListener(DatabaseListener listener) {
databaseListenerDispatcher.addWeakListener(listener);
}
@Override
public final void removeDatabaseListener(DatabaseListener listener) {
databaseListenerDispatcher.removeListener(listener);
}
/**
* Actual implementation of database detach.
*
* Implementations of this method should only be called from {@link #close()}, and should not
* notify database listeners of the database {@link DatabaseListener#detaching(FbDatabase)} and
* {@link DatabaseListener#detached(FbDatabase)} events.
*
*/
protected abstract void internalDetach() throws SQLException;
/**
* {@inheritDoc}
*
* Implementation note: Calls {@link #checkConnected()} and notifies database listeners of the detaching event, then
* calls {@link #internalDetach()} and finally notifies database listeners of database detach and removes all
* listeners.
*
*/
@Override
public final void close() throws SQLException {
try {
checkConnected();
synchronized (getSynchronizationObject()) {
if (getActiveTransactionCount() > 0) {
// Throw open transactions as exception, fbclient doesn't disconnect with outstanding (unprepared)
// transactions
// In the case of wire protocol we could ignore this and simply close, but that would be
// inconsistent with fbclient
throw new FbExceptionBuilder()
.exception(ISCConstants.isc_open_trans)
.messageParameter(getActiveTransactionCount())
.toSQLException();
}
databaseListenerDispatcher.detaching(this);
try {
internalDetach();
} finally {
databaseListenerDispatcher.detached(this);
databaseListenerDispatcher.shutdown();
exceptionListenerDispatcher.shutdown();
}
}
} catch (SQLException ex) {
exceptionListenerDispatcher.errorOccurred(ex);
throw ex;
} finally {
exceptionListenerDispatcher.shutdown();
}
}
@Override
public final int getOdsMajor() {
return odsMajor;
}
/**
* Sets the ODS (On Disk Structure) major version of the database associated
* with this connection.
*
* This method should only be called by this instance.
*
*
* @param odsMajor
* ODS major version
*/
protected final void setOdsMajor(int odsMajor) {
this.odsMajor = odsMajor;
}
@Override
public final int getOdsMinor() {
return odsMinor;
}
/**
* Sets the ODS (On Disk Structure) minor version of the database associated
* with this connection.
*
* This method should only be called by this instance.
*
*
* @param odsMinor
* The ODS minor version
*/
protected final void setOdsMinor(int odsMinor) {
this.odsMinor = odsMinor;
}
/**
* @return The (full) statement info request items.
* @see #getParameterDescriptionInfoRequestItems()
*/
public final byte[] getStatementInfoRequestItems() {
return getServerVersionInformation().getStatementInfoRequestItems();
}
/**
* @return The {@code isc_info_sql_describe_vars} info request items.
* @see #getStatementInfoRequestItems()
*/
public final byte[] getParameterDescriptionInfoRequestItems() {
return getServerVersionInformation().getParameterDescriptionInfoRequestItems();
}
@Override
public final R getDatabaseInfo(byte[] requestItems, int bufferLength, InfoProcessor infoProcessor)
throws SQLException {
final byte[] responseBuffer = getDatabaseInfo(requestItems, bufferLength);
try {
return infoProcessor.process(responseBuffer);
} catch (SQLException ex) {
exceptionListenerDispatcher.errorOccurred(ex);
throw ex;
}
}
protected byte[] getDescribeDatabaseInfoBlock() {
return DESCRIBE_DATABASE_INFO_BLOCK;
}
protected InfoProcessor getDatabaseInformationProcessor() {
return new DatabaseInformationProcessor();
}
@Override
public final void transactionStateChanged(FbTransaction transaction, TransactionState newState,
TransactionState previousState) {
switch (newState) {
case PREPARED:
activeTransactions.remove(transaction);
break;
case COMMITTING:
case ROLLING_BACK:
/* Even if the commit or rollback fails, we no longer consider it an active transaction
Introduced as the commit/rollback might fail in a shutdown database (at least in FB 2.1) and a
subsequent close wouldn't as there are "active" transactions.
This is acceptable as commit/rollback failure should be limited to situations were the database
is either inaccessible and the transaction is likely already rolled back or pending rollback by
the server, or the transaction was already committed or rolled back.
*/
// TODO "register" transaction as pendingEnd for debugging?
activeTransactions.remove(transaction);
break;
case COMMITTED:
case ROLLED_BACK:
activeTransactions.remove(transaction);
transaction.removeTransactionListener(this);
break;
default:
// do nothing
break;
}
}
@Override
public BlobParameterBuffer createBlobParameterBuffer() {
return new BlobParameterBufferImp();
}
@Override
public TransactionParameterBufferImpl createTransactionParameterBuffer() {
return new TransactionParameterBufferImpl();
}
@Override
public IConnectionProperties getConnectionProperties() {
return connection.getAttachProperties().asImmutable();
}
@Override
public final RowDescriptor emptyRowDescriptor() {
return emptyRowDescriptor;
}
private class DatabaseInformationProcessor implements InfoProcessor {
@Override
public FbDatabase process(byte[] info) throws SQLException {
boolean debug = log.isDebugEnabled();
if (info.length == 0) {
throw new SQLException("Response buffer for database information request is empty");
}
if (debug)
log.debug(String.format("DatabaseInformationProcessor.process: first 2 bytes are %04X or: %02X, %02X",
iscVaxInteger2(info, 0), info[0], info[1]));
int value;
int len;
int i = 0;
while (info[i] != ISCConstants.isc_info_end) {
switch (info[i++]) {
case ISCConstants.isc_info_db_sql_dialect:
len = iscVaxInteger2(info, i);
i += 2;
value = iscVaxInteger(info, i, len);
i += len;
setDatabaseDialect((short) value);
if (debug) log.debug("isc_info_db_sql_dialect:" + value);
break;
case ISCConstants.isc_info_ods_version:
len = iscVaxInteger2(info, i);
i += 2;
value = iscVaxInteger(info, i, len);
i += len;
setOdsMajor(value);
if (debug) log.debug("isc_info_ods_version:" + value);
break;
case ISCConstants.isc_info_ods_minor_version:
len = iscVaxInteger2(info, i);
i += 2;
value = iscVaxInteger(info, i, len);
i += len;
setOdsMinor(value);
if (debug) log.debug("isc_info_ods_minor_version:" + value);
break;
case ISCConstants.isc_info_firebird_version: {
len = iscVaxInteger2(info, i);
i += 2;
final int expectedIndex = i + len;
final int versionCount = info[i++] & 0xFF;
final String[] versionParts = new String[versionCount];
for (int versionIndex = 0; versionIndex < versionCount; versionIndex++) {
int versionLength = info[i++] & 0xFF;
versionParts[versionIndex] = new String(info, i, versionLength, StandardCharsets.UTF_8);
i += versionLength;
}
assert i == expectedIndex : "Parsing version information lead to wrong index";
setServerVersion(versionParts);
if (debug) log.debug("isc_info_firebird_version: " + Arrays.toString(versionParts));
break;
}
case ISCConstants.isc_info_truncated:
if (debug) log.debug("isc_info_truncated ");
return AbstractFbDatabase.this;
default:
throw new FbExceptionBuilder().exception(ISCConstants.isc_infunk).toSQLException();
}
}
return AbstractFbDatabase.this;
}
}
}