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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.powertoys;
import java.sql.SQLException;
import java.util.Properties;
import com.sap.dbtech.jdbc.DriverSapDB;
import com.sap.dbtech.rte.comm.JdbcCommFactory;
import com.sap.dbtech.rte.comm.JdbcCommunication;
import com.sap.dbtech.rte.comm.NativeComm;
import com.sap.dbtech.rte.comm.RTEException;
import com.sap.dbtech.rte.comm.SocketComm;
import com.sap.dbtech.util.MessageKey;
import com.sap.dbtech.util.MessageTranslator;
import com.sap.dbtech.util.StructuredMem;
import com.sap.dbtech.util.Tracer;
/**
* Executes loader commands for SAP DB
*/
public class Loader
{
public static final String hostKeyC = "host";
private static final String hostDefaultC = "";
public static final String dbnameKeyC = "dbname";
private static final String dbnameDefaultC = "";
public static final String dbrootKeyC = "dbroot";
private static final String dbrootDefaultC = "";
public static final String userKeyC = "user";
private static final String pgmNameC = "lserver";
private static final String transportC = "transport";
private static final int alignSizeC = 8;
static final int indicatorLengthC = 4;
private JdbcCommunication connection;
private boolean inCommunication;
/**
creates a new Loader.
The following properties are used by this class:
<UL>
<LI>"host": start lserver on this host
<LI>"dbname": start lserver for this database
<LI>"dbroot": start dbmserver for this release/diretory
<LI>"user": user,pwd implicit lserver connect (not yet implemented)
<UL>
*/
public Loader(Properties properties) throws RTEException {
String host = properties.getProperty(hostKeyC, hostDefaultC);
String dbname = properties.getProperty(dbnameKeyC, dbnameDefaultC);
String dbroot = properties.getProperty(dbrootKeyC, dbrootDefaultC);
String transport = properties.getProperty(transportC, "socket");
JdbcCommFactory factory = null;
try {
try {
if (DriverSapDB.loadNativeCommunication() == DriverSapDB.nativeCommunication_enabled) {
factory = NativeComm.factory;
} else {
factory = SocketComm.factory;
// if native communication is available on all platforms the
// following should be uncomment
// throw new RTEException(MessageTranslator.translate(
// MessageKey.ERROR_LIBRARYNOTLOADED,
// DriverSapDB.nativeCommunication_dllName_C, ""), -10899);
}
DriverSapDB.openTrace("",properties);
Tracer.print ("new Loader Connection ", properties);
this.connection = factory.xopen(host, dbname, dbroot, pgmNameC,
properties);
} catch (Error linkErr) {
factory = SocketComm.factory;
this.connection = factory.xopen(host, dbname,
dbroot, pgmNameC, properties);
// if native communication is available on all platforms the
// following should be uncomment
// throw new RTEException(MessageTranslator.translate(
// MessageKey.ERROR_LIBRARYNOTLOADED,
// DriverSapDB.nativeCommunication_dllName_C, linkErr
// .toString()), -10899);
}
}catch (RTEException rteExc) {
Tracer.println ("using "+factory);
Tracer.println ("=> FAILED");
throw rteExc;
}
Tracer.println ("using "+this.connection);
Tracer.println ("=> " + this);
}
/**
* closes the connection
*/
public void release ()
throws RTEException
{
Tracer.println (this+"->release ()");
if (this.connection != null) {
try {
try {
this.cmd("release");
}
catch (Exception ignore) {}
this.connection.release ();
}
finally {
this.connection = null;
}
}
}
/**
*
*/
public void finalize ()
throws RTEException
{
this.release ();
}
/**
* executes <i>cmdString</i> in the current lserver session.
*
* @exception LoaderException
* @exception RTEException
*/
public String cmd(String cmdString) throws RTEException, LoaderException {
Tracer.println(this + "->cmd (" + cmdString + ")");
StructuredMem request;
int alignedLen;
StructuredMem reply;
String result;
try {
/*
* send request
*/
request = this.connection.getRequestPacket();
if (cmdString.length() == 0) {
request.putBytes(new byte[]{0x00}, 0);
alignedLen = (1+ alignSizeC - 1) / alignSizeC * alignSizeC;
} else {
request.putString(cmdString, 0);
alignedLen = (cmdString.length() + alignSizeC - 1) / alignSizeC * alignSizeC;
}
this.connection.request(request, alignedLen);
this.inCommunication = true;
reply = this.connection.receive();
this.inCommunication = false;
/*
* parse result and throw exception
*/
String errorIndicator = reply.getString(0, Math.min(
indicatorLengthC, reply.size()));
if (errorIndicator.startsWith("OK")) {
int dataStart = errorIndicator.indexOf('\n') + 1;
result = reply.getString(dataStart, reply.size() - dataStart);
} else {
throw LoaderException.create(reply);
}
Tracer.println("=> "+result);
return result;
} catch (LoaderException e) {
Tracer.println(" <-!");
Tracer.traceException(e);
throw e;
} catch (RTEException err) {
Tracer.println(" <-!");
Tracer.traceException(err);
throw err;
} finally {
this.inCommunication = false;
}
}
public void cancel() throws SQLException
{
if(inCommunication) {
this.connection.cancel();
}
}
/**
* creates a new Loader by specifying the host and the dbname
*/
public static Loader dbLoader (String host, String dbname)
throws RTEException
{
Properties props = new Properties ();
if (host != null) {
props.put (hostKeyC, host);
}
if (dbname != null) {
props.put (dbnameKeyC, dbname);
}
return new Loader (props);
}
/**
* create a new Loader by specifying the host and the dbroot
*/
public static Loader dbrootLoader (String host, String dbroot)
throws RTEException
{
Properties props = new Properties ();
if (host != null) {
props.put (hostKeyC, host);
}
props.put (dbrootKeyC, dbroot);
return new Loader (props);
}
}
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