/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * <BR><BR>
 *
 * Author: Sam McIntosh, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 2011 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */

package org.greenstone.gatherer.util;
import java.io.File;

/** Class for GS3, for issuing ant commands from GLI */
public class GS3ServerThread extends Thread
{
    String _gsdl3_src_path = "";
    String _ant_command = "";
    
    public GS3ServerThread(String gsdl3_src_path, String ant_command)
    {
	_gsdl3_src_path = gsdl3_src_path;
	_ant_command = ant_command; // "restart"
    }
    
    public void run()
    {
	try
	    {
		///System.err.println("**** GS3 server : " + _ant_command);

		String shellCommand = null;
		Process p = null;
		if (Utility.isWindows())
		    {
			if(_ant_command.indexOf("start") != -1) { // running an "ant (re)start" command on windows, run start
			    _ant_command = "start";
			}
			// The path in quotes, and the entire sequence of commands in quotes as well
			// E.g. the following works: cmd /C "cd "C:\path\to\greenstone3" && ant stop"
			// and it preserves any spaces in the path to GSDL3SRCHOME (_gsdl3_src_path).
			p = Runtime.getRuntime().exec("cmd /C \"cd \"" + _gsdl3_src_path + File.separator + "\" && ant " + _ant_command + "\"");	
		    }
		else
		    {
			if(_ant_command.indexOf("start") != -1) { // if running an "ant (re)start" command on non-Windows, run restart
			    _ant_command = "restart";
			}
			p = Runtime.getRuntime().exec(new String[]{"/bin/bash", "-c", "ant " + _ant_command + " -f \"" + _gsdl3_src_path + File.separator + "build.xml\""});
		    }

		if (p != null) {
			// in order for the process.waitFor() method to work with Java 6 (JRE 6 is included in GS binaries)
			// need to make sure the IOstreams of the process are not blocked. For Java 7, this is not necessary
			// and a waitFor() is sufficient. But with Java 6, the waitFor() causes the server to finally start
			// after the user has quit GLI.
		
			// Process takes no input, but we will still catch this iostream too
			// And we'll catch the error and output streams to prevent them from blocking during waitFor()
			// (For normal input and output stream handling using the Gobblers, see FormatConversionDialog.java)
			OutputStreamGobbler inputGobbler = new OutputStreamGobbler(p.getOutputStream(), null);			
            InputStreamGobbler errorGobbler = new InputStreamGobbler(p.getErrorStream(), true);
            InputStreamGobbler outputGobbler = new InputStreamGobbler(p.getInputStream());
            
            errorGobbler.start();
            outputGobbler.start();
			inputGobbler.start();
			
			// the important part: wait for the process (ant stop or start or re-start to terminate)
			int result = p.waitFor();
			if(result != 0) {
			System.err.println("**** Failed to successfully " + _ant_command + " the GS3 server.");
			}		
			
			outputGobbler.join();
			errorGobbler.join();
			inputGobbler.join();
		} else {
		    System.err.println("**** Could not start the Process to " + _ant_command + " the GS3 server.");
		}

	    }
	catch(Exception ex)
	    {
		ex.printStackTrace();
	    }
    }
}