/
Begin.java
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/
Begin.java
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/**
* Copyright (c) 2002-2012 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j 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 3 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, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.shell.kernel.apps;
import java.rmi.RemoteException;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import org.neo4j.helpers.Service;
import org.neo4j.kernel.AbstractGraphDatabase;
import org.neo4j.shell.App;
import org.neo4j.shell.AppCommandParser;
import org.neo4j.shell.Output;
import org.neo4j.shell.Session;
import org.neo4j.shell.ShellException;
import org.neo4j.shell.kernel.GraphDatabaseShellServer;
@Service.Implementation(App.class)
public class Begin extends ReadOnlyGraphDatabaseApp
{
@Override
public String getDescription()
{
return "Opens a transaction";
}
@Override
protected String exec( AppCommandParser parser, Session session, Output out )
throws ShellException, RemoteException
{
Transaction tx = currentTransaction( getServer() );
getServer().getDb().beginTx();
Integer txCount = (Integer) session.get( "tx_count" );
int count;
if ( txCount == null )
{
if ( tx == null )
{
count = 0;
} else
{
count = 1;
}
} else
{
count = txCount;
}
session.set( "tx_count", ++count );
out.println("Transaction started");
return null;
}
public static Transaction currentTransaction( GraphDatabaseShellServer server ) throws ShellException
{
try
{
return ((AbstractGraphDatabase) server.getDb()).getTxManager().getTransaction();
} catch ( SystemException e )
{
throw new ShellException( e.getMessage() );
}
}
}