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A generic command shell with a client and server part.
There is a newer version: 3.3.2
/*
 * Copyright (c) 2002-2016 "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 .
 */
package org.neo4j.shell.kernel.apps;

import java.rmi.RemoteException;

import org.neo4j.helpers.Service;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.impl.coreapi.TopLevelTransaction;
import org.neo4j.shell.App;
import org.neo4j.shell.AppCommandParser;
import org.neo4j.shell.Continuation;
import org.neo4j.shell.Output;
import org.neo4j.shell.Session;
import org.neo4j.shell.ShellException;
import org.neo4j.shell.Variables;

@Service.Implementation(App.class)
public class Commit extends NonTransactionProvidingApp
{
    @Override
    public String getDescription()
    {
        return "Commits a transaction";
    }

    @Override
    protected Continuation exec( AppCommandParser parser, Session session, Output out )
            throws ShellException, RemoteException
    {
        if ( parser.getLineWithoutApp().trim().length() > 0 )
        {
            out.println( "Error: COMMIT should  be run without trailing arguments" );
            return Continuation.INPUT_COMPLETE;
        }

        Integer txCount = session.getCommitCount();

        KernelTransaction tx = Begin.currentTransaction( getServer() );
        if ( txCount == null || txCount.equals( 0 ) )
        {
            if ( tx != null )
            {
                out.println( "Warning: committing a transaction not started by the shell" );
                txCount = 1;
            }
            else
            {
                throw new ShellException( "Not in a transaction" );
            }
        }

        if ( txCount.equals( 1 ) )
        {
            if ( tx == null )
            {
                throw fail( session, "Not in a transaction" );
            }

            try
            {
                tx.success();
                tx.close();
                session.remove( Variables.TX_COUNT );
                out.println( "Transaction committed" );
                return Continuation.INPUT_COMPLETE;
            }
            catch ( Exception e )
            {
                throw fail( session, e.getMessage() );
            }
        }
        else
        {
            session.set( Variables.TX_COUNT, --txCount );
            out.println( String.format( "Nested transaction committed (Tx count: %d)", txCount ) );
            return Continuation.INPUT_COMPLETE;
        }
    }

    public static ShellException fail( Session session, String message ) throws ShellException
    {
        session.remove( Variables.TX_COUNT );
        return new ShellException( message );
    }
}