public int run()

in src/main/java/org/apache/maven/shared/verifier/Embedded3xLauncher.java [193:241]
45 lines of code
5 McCabe index (conditional complexity)

    public int run( String[] cliArgs, Properties systemProperties, String workingDirectory, File logFile )
        throws IOException, LauncherException
    {
        PrintStream out = ( logFile != null )
            ? new PrintStream( Files.newOutputStream( logFile.toPath() ) ) : System.out;
        try
        {
            File workingDirectoryPath = new File( workingDirectory );
            Properties originalProperties = System.getProperties();
            System.setProperties( null );
            System.setProperty( "maven.home", originalProperties.getProperty( "maven.home", "" ) );
            System.setProperty( "user.dir", workingDirectoryPath.getAbsolutePath() );
            System.setProperty( "maven.multiModuleProjectDirectory", 
                    findProjectBaseDirectory( workingDirectoryPath ).getAbsolutePath() );

            for ( Object o : systemProperties.keySet() )
            {
                String key = (String) o;
                String value = systemProperties.getProperty( key );
                System.setProperty( key, value );
            }

            ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
            Thread.currentThread().setContextClassLoader( mavenCli.getClass().getClassLoader() );
            try
            {
                Object result = doMain.invoke( mavenCli, new Object[] { cliArgs, workingDirectory, out, out } );

                return ( (Number) result ).intValue();
            }
            finally
            {
                Thread.currentThread().setContextClassLoader( originalClassLoader );

                System.setProperties( originalProperties );
            }
        }
        catch ( IllegalAccessException | InvocationTargetException e )
        {
            throw new LauncherException( "Failed to run Maven", e );
        }
        finally
        {
            if ( logFile != null )
            {
                out.close();
            }
        }
    }