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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.management;
import org.firebirdsql.gds.ServiceRequestBuffer;
import org.firebirdsql.gds.ServiceParameterBuffer;
import org.firebirdsql.gds.impl.GDSType;
import org.firebirdsql.gds.ng.FbService;
import java.io.IOException;
import java.sql.SQLException;
import java.util.Arrays;
import java.io.OutputStream;
import java.io.InputStream;
import java.io.BufferedInputStream;
import static org.firebirdsql.gds.ISCConstants.*;
import static org.firebirdsql.gds.VaxEncoding.iscVaxInteger2;
import static org.firebirdsql.gds.VaxEncoding.iscVaxInteger;
/**
* Implements the streaming version of the backup and restore functionality of
* Firebird Services API.
*
* @author Roman Rokytskyy
* @author Mark Rotteveel
*/
public class FBStreamingBackupManager extends FBBackupManagerBase implements BackupManager {
private OutputStream backupOutputStream = null;
private BufferedInputStream restoreInputStream = null;
private int backupBufferSize = BUFFER_SIZE * 30; // 30K
private final int MAX_RESTORE_CHUNK = 65532;
private final int DATA_NOT_READY = 0;
private final int END_OF_STREAM = -1;
/**
* Set the local buffer size to be used when doing a backup. Default is
* 30720
*
* @param bufferSize
* The buffer size to be used, a positive value
*/
public void setBackupBufferSize(int bufferSize) {
if (bufferSize < 0) {
throw new IllegalArgumentException("Buffer size must be positive");
}
this.backupBufferSize = bufferSize;
}
/**
* Create a new instance of FBStreamingBackupManager based on
* the default GDSType.
*/
public FBStreamingBackupManager() {
}
/**
* Create a new instance of FBStreamingBackupManager based on a
* given GDSType.
*
* @param gdsType
* type must be PURE_JAVA, EMBEDDED, or NATIVE
*/
public FBStreamingBackupManager(String gdsType) {
super(gdsType);
}
/**
* Create a new instance of FBStreamingBackupManager based on a
* given GDSType.
*
* @param gdsType
* type must be PURE_JAVA, EMBEDDED, or NATIVE
*/
public FBStreamingBackupManager(GDSType gdsType) {
super(gdsType);
}
public void setBackupPath(String backupPath) {
throw new IllegalArgumentException("You cannot use setBackupPath(String) for Streaming backups.");
}
public void addBackupPath(String path, int size) {
throw new IllegalArgumentException("You cannot use setBackupPath(String) for Streaming backups.");
}
public void setBackupOutputStream(OutputStream backupStream) {
backupOutputStream = backupStream;
}
public void setRestoreInputStream(InputStream restoreStream) {
restoreInputStream = (restoreStream instanceof BufferedInputStream)
? (BufferedInputStream) restoreStream
: new BufferedInputStream(restoreStream, 128 * MAX_RESTORE_CHUNK);
}
public void clearBackupPaths() {
backupOutputStream = null;
}
public void backupDatabase(int options) throws SQLException {
if (backupOutputStream == null) {
throw new SQLException("No output stream specified for the backup.");
}
try (FbService service = attachServiceManager()) {
executeServiceBackupOperation(service, getBackupSRB(service, options));
}
}
public void restoreDatabase(int options) throws SQLException {
if (restoreInputStream == null) {
throw new SQLException("No input stream specified for the restore.");
}
try (FbService service = attachServiceManager()) {
executeServiceRestoreOperation(service, getRestoreSRB(service, options));
}
}
/**
* Streaming backups are currently not capable of verbose output
*/
protected boolean verboseBackup() {
return false;
}
/**
* Set the page size that will be used for a restored database. The value
* for pageSize must be one of: 4096, 8192 or 16384. The
* default value depends on the Firebird version. Pages smaller than 4096
* were dropped in 2006 and are by definition unavailable with the streaming
* functionality of the Services API
*
* @param pageSize
* The page size to be used in a restored database, one of 4196, 8192 or 16384
* @see PageSizeConstants
*/
@Override
public void setRestorePageSize(int pageSize) {
if (pageSize < 4096) {
throw new IllegalArgumentException(
"FirebirdSQL versions with streaming restore support don't support pages below 4096");
}
super.setRestorePageSize(pageSize);
}
/**
* Adds stdout as a source for the backup operation
*
* @param backupSPB
* The buffer to be used during the backup operation
*/
protected void addBackupsToBackupRequestBuffer(FbService service, ServiceRequestBuffer backupSPB) {
backupSPB.addArgument(isc_spb_bkp_file, "stdout");
}
/**
* Adds stdin as a source for the restore operation
*
* @param restoreSPB
* The buffer to be used during the restore operation
*/
protected void addBackupsToRestoreRequestBuffer(FbService service, ServiceRequestBuffer restoreSPB) {
restoreSPB.addArgument(isc_spb_bkp_file, "stdin");
}
private void executeServiceBackupOperation(FbService service, ServiceRequestBuffer srb) throws SQLException {
try {
service.startServiceAction(srb);
ServiceRequestBuffer infoSRB = service.createServiceRequestBuffer();
infoSRB.addArgument(isc_info_svc_to_eof);
int bufferSize = backupBufferSize;
boolean processing = true;
while (processing) {
byte[] buffer = service.getServiceInfo(null, infoSRB, bufferSize);
switch (buffer[0]) {
case isc_info_svc_to_eof:
if (readOutput(buffer, 0, backupOutputStream) == END_OF_STREAM) {
processing = false;
}
break;
case isc_info_truncated:
bufferSize = bufferSize * 2;
break;
case isc_info_end:
processing = false;
break;
default:
throw new SQLException("Unexpected response from service.");
}
}
} catch (IOException ioe) {
throw new SQLException(ioe);
}
}
private void executeServiceRestoreOperation(FbService service, ServiceRequestBuffer srb) throws SQLException {
try {
service.startServiceAction(srb);
OutputStream currentLogger = getLogger();
ServiceRequestBuffer infoSRB = service.createServiceRequestBuffer();
ServiceParameterBuffer infoSPB = null;
infoSRB.addArgument(isc_info_svc_stdin);
infoSRB.addArgument(isc_info_svc_line);
if (this.verbose && currentLogger == null)
throw new SQLException("Verbose mode was requested but there is no logger provided.");
int bufferSize = BUFFER_SIZE;
byte[] stdinBuffer = new byte[MAX_RESTORE_CHUNK];
byte[] newLine = System.getProperty("line.separator").getBytes();
boolean processing = true;
boolean sending = true;
byte[] buffer;
while (processing || infoSPB != null) {
buffer = service.getServiceInfo(infoSPB, infoSRB, bufferSize);
if (infoSPB != null && !sending) {
infoSRB = service.createServiceRequestBuffer();
infoSRB.addArgument(isc_info_svc_line);
}
infoSPB = null;
for (int codePos = 0; codePos < buffer.length && buffer[codePos] != isc_info_end;) {
switch (buffer[codePos]) {
case isc_info_svc_stdin:
int requestedBytes = Math.min(iscVaxInteger(buffer, ++codePos, 4), stdinBuffer.length);
codePos += 4;
if (requestedBytes > 0) {
int actuallyReadBytes = restoreInputStream.read(stdinBuffer, 0, requestedBytes);
if (actuallyReadBytes > 0) {
infoSPB = service.createServiceParameterBuffer();
if (stdinBuffer.length == actuallyReadBytes)
infoSPB.addArgument(isc_info_svc_line, stdinBuffer);
else
infoSPB.addArgument(isc_info_svc_line,
Arrays.copyOfRange(stdinBuffer, 0, actuallyReadBytes));
}
restoreInputStream.mark(2);
if (restoreInputStream.read() < 0)
sending = false;
else
restoreInputStream.reset();
}
break;
case isc_info_truncated:
bufferSize *= 2;
++codePos;
break;
case isc_info_svc_line:
int bytesToLog = readOutput(buffer, codePos, currentLogger);
codePos += 3;
switch (bytesToLog) {
case DATA_NOT_READY:
++codePos;
break;
case END_OF_STREAM:
processing = false;
break;
default:
codePos += bytesToLog;
if (currentLogger != null)
currentLogger.write(newLine);
}
break;
case isc_info_end:
break;
default:
throw new SQLException("Unexpected response from service.");
}
}
}
} catch (IOException ioe) {
throw new SQLException(ioe);
}
}
private int readOutput(byte[] buffer, int offset, OutputStream out) throws SQLException, IOException {
int dataLength = iscVaxInteger2(buffer, offset + 1);
if (dataLength == 0) {
switch (buffer[offset + 3]) {
case isc_info_data_not_ready:
return DATA_NOT_READY;
case isc_info_end:
return END_OF_STREAM;
default:
throw new SQLException("Unexpected end of stream reached.");
}
}
if (out != null) {
out.write(buffer, offset + 3, dataLength);
}
return dataLength;
}
}
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