/*
 The MIT License

 Copyright (c) 2005 - 2007
   1. Distributed Systems Group, University of Portsmouth (2005)
   2. Aamir Shafi (2005 - 2007)
   3. Bryan Carpenter (2005 - 2007)
   4. Mark Baker (2005 - 2007)

 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:

 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
 * File         : MPJRun.java 
 * Author       : Aamir Shafi, Bryan Carpenter
 * Created      : Sun Dec 12 12:22:15 BST 2004
 * Revision     : $Revision: 1.35 $
 * Updated      : $Date: 2006/10/20 17:24:47 $
 */


package runtime.starter;

import java.nio.channels.*;
import java.nio.*;
import java.net.*;
import java.io.*;
import java.util.*;

import org.mortbay.http.HttpServer;
import org.mortbay.http.SocketListener;
import org.mortbay.http.HttpListener;
import org.mortbay.http.HttpContext;
import org.mortbay.http.handler.ResourceHandler;

import org.apache.log4j.Logger ;
import org.apache.log4j.PropertyConfigurator ;
import org.apache.log4j.PatternLayout ;
import org.apache.log4j.FileAppender ;
import org.apache.log4j.Level ;
import org.apache.log4j.DailyRollingFileAppender ;
import org.apache.log4j.spi.LoggerRepository ;

import runtime.MPJRuntimeException ;

public class MPJRun {

  private static int MPJ_SERVER_PORT = 20000 ; 
  private static int mxBoardNum = 0 ; 
  private static int D_SER_PORT = 10000 ;
  int S_PORT = 15000; 
  String machinesFile = "machines" ; 
  ArrayList<String> jvmArgs = new ArrayList<String>() ; 
  ArrayList<String> appArgs = new ArrayList<String>() ; 
  String[] jArgs = null ;  
  String[] aArgs = null ;
  private int psl = 128*1024 ;  //128K 
  static Logger logger = null ; 
  FileOutputStream cfos = null;
  File CONF_FILE = null;
  private volatile boolean wait = true;
  private Vector<SocketChannel> peerChannels;
  private InetAddress localaddr = null;
  private Selector selector = null;
  private volatile boolean selectorFlag = true;
  private String LOG_FILE = null;
  private String hostName = null;
  private String hostIP = null;
  private Thread selectorThreadStarter = null;
  private Vector machineVector = new Vector();
  int nprocs = 1;
  String spmdClass = null;
  String mpjURL = null;
  String deviceName = "niodev";
  String applicationArgs = "default_app_arg" ;
  String mpjHomeDir = null;
  byte[] urlArray = null;
  Hashtable procsPerMachineTable = new Hashtable();
  int endCount = 0; 
  int streamEndedCount = 0 ;
  String wdir;
  String jarName = null;
  String className = null ; 
  String codeBase = null;
  String mpjCodeBase = null ; 
  HttpServer server = null;
  HttpServer mpjServer = null; 
  ByteBuffer buffer = ByteBuffer.allocate(1000);
  String loader = "useRemoteLoader";

  private static final boolean DEBUG = false ; 

  /**
   * Every thing is being inside this constructor :-)
   */
  public MPJRun(String args[]) throws Exception {
		  
    Map<String,String> map = System.getenv() ;
	    mpjHomeDir = map.get("MPJ_HOME");

    createLogger(args) ; 

    if(DEBUG && logger.isDebugEnabled()) {
      logger.info(" --MPJRun invoked--"); 
      logger.info(" adding shutdown hook thread"); 
    }

	    
    if(DEBUG && logger.isDebugEnabled()) {
      logger.info("processInput called ..."); 
    }

    processInput(args);
    //System.exit(0) ; 
    readMachineFile();
    machinesSanityCheck() ;
	    
    CONF_FILE = new File( codeBase+"/mpjdev.conf");
    mpjCodeBase = mpjHomeDir+"/lib"; 
/*
    if(CONF_FILE.exists()) {
      throw new RuntimeException("Another mpjrun module is already running "+
		      "on this machine"); 
    }
*/    
	    
    CONF_FILE.deleteOnExit() ;

    if(DEBUG && logger.isDebugEnabled()) { 
      logger.debug("CONF_FILE_PATH <"+CONF_FILE.getAbsolutePath()+">");
    }
    assignTasks();

    try {

      localaddr = InetAddress.getLocalHost();
      hostName = localaddr.getHostName();
      hostIP = localaddr.getHostAddress(); 

      if(DEBUG && logger.isDebugEnabled()) {
	logger.debug("Address: " + localaddr);
	logger.debug("Name :" + hostName);
      }

    }
    catch (UnknownHostException unkhe) {
      throw new MPJRuntimeException(unkhe);  
    }


    if(jarName != null) {
      spmdClass = "http://"+hostIP+":"+S_PORT+"/"+jarName;
    }
    else {
      spmdClass = "http://"+hostIP+":"+S_PORT+"/";
    }

    mpjURL = "http://"+hostIP+":"+(S_PORT+1)+"/mpj.jar";
	    
    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("spmdClass<"+spmdClass+">");
    }

    urlArray = spmdClass.getBytes();

    peerChannels = new Vector<SocketChannel>();

    selector = Selector.open();

    clientSocketInit();

    startHttpServer();

    selectorThreadStarter = new Thread(selectorThread);

    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("Starting the selector thread ");
    }

    selectorThreadStarter.start();

    /* 
     * wait till this client has connected to all daemons
     */
    Wait();

    buffer.clear();

    for (int j = 0; j < peerChannels.size(); j++) {

      SocketChannel socketChannel = peerChannels.get(j);
      
      if(DEBUG && logger.isDebugEnabled()) { 
	logger.debug("procsPerMachineTable " + procsPerMachineTable);
      }
	      
      String hName = socketChannel.socket().getInetAddress().getHostName();

      /* 
       * It can't be a good assumption that procsPerMachineTable contains
       * hostNames as keys ..can be it an IP????
       */
      int nProcesses = ((Integer) procsPerMachineTable.get(hName)).intValue();

      pack(nProcesses); 

      if(DEBUG && logger.isDebugEnabled()) { 
	logger.debug("Sending to " + socketChannel);
      }

      int w = 0 ; 
      while(buffer.hasRemaining()) {
	if((w += socketChannel.write(buffer)) == -1) {
	  //throw an exception ...
	} 
      }
      if(DEBUG && logger.isDebugEnabled()) { 
	logger.debug("Wrote bytes-->"+w+"to process"+j);
      }

      buffer.clear();

    }

    if(DEBUG && logger.isDebugEnabled()) { 
      logger.debug("procsPerMachineTable " + procsPerMachineTable);
    }

    addShutdownHook();

    /* 
     * waiting to get the answer from the daemons that the job has finished.
     */ 
    Wait();

    logger.debug("Calling the finish method now");

    this.finish();

  }
  private void startHttpServer() throws Exception {

    server = new HttpServer();
    SocketListener listener = new SocketListener();
    listener.setPort(S_PORT);
    server.addListener(listener);
    HttpContext context = new HttpContext();
    context.setContextPath("/");
    context.setResourceBase(codeBase);
    context.addHandler(new ResourceHandler());
    server.addContext(context);
    server.start();
    
    mpjServer = new HttpServer();
    SocketListener listener2 = new SocketListener();
    listener2.setPort(S_PORT+1);
    mpjServer.addListener(listener2);
    HttpContext context2 = new HttpContext();
    context2.setContextPath("/");
    context2.setResourceBase(mpjCodeBase);
    context2.addHandler(new ResourceHandler());
    mpjServer.addContext(context2);
    mpjServer.start();
  }
	  
  /* 
   * 1. URL [http://holly:port/codebase/test.jar]
   * 2. NP  [# of processes]
   * 3. args to JVM
   * 4. device to use 
   * 5. application arguments ..
   * 6. GO_FOR_IT_SIGNAL 
   */ 
  private void pack(int nProcesses) {
    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer (initial)" + buffer);
    }
    buffer.put("url-".getBytes());

    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer (after putting url-) " + buffer);
    }
    buffer.putInt(urlArray.length);

    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer urlArray.length)" + buffer);
    }

    buffer.put(urlArray, 0, urlArray.length);

    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer urlArray itself " + buffer);
    }

    buffer.put("num-".getBytes());
	 
    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer " + buffer);
    }

    buffer.putInt(4);

    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer(after writing 4) " + buffer);
      logger.debug("nProcesses " + nProcesses);
    }

    buffer.putInt(nProcesses);

    if(DEBUG && logger.isDebugEnabled()) {
      logger.debug("buffer(after nProcesses) " + buffer);
    }

    buffer.put("arg-".getBytes());
    buffer.putInt(jArgs.length); 
    for(int j=0 ; j<jArgs.length ; j++) {
      buffer.putInt(jArgs[j].getBytes().length);
      buffer.put(jArgs[j].getBytes(), 0, jArgs[j].getBytes().length);
    }

    if(wdir != null) {
      buffer.put("wdr-".getBytes());
      buffer.putInt(wdir.getBytes().length);
      buffer.put(wdir.getBytes(), 0, wdir.getBytes().length); 
    }
    
    if(className != null) {
      buffer.put("cls-".getBytes());
      buffer.putInt(className.getBytes().length);
      buffer.put(className.getBytes(), 0, className.getBytes().length); 
    }

    buffer.put("mul-".getBytes()); //mpj URL ..
    buffer.putInt(mpjURL.getBytes().length);
    buffer.put(mpjURL.getBytes(), 0, 
		    mpjURL.getBytes().length); 
    
    buffer.put("dev-".getBytes());
    buffer.putInt(deviceName.getBytes().length);
    buffer.put(deviceName.getBytes(), 0, deviceName.getBytes().length); 

    buffer.put("ldr-".getBytes());
    buffer.putInt(loader.getBytes().length);
    buffer.put(loader.getBytes(), 0, loader.getBytes().length); 
	    
    buffer.put("app-".getBytes());
    buffer.putInt(aArgs.length); 

    for(int j=0 ; j<aArgs.length ; j++) {
      buffer.putInt(aArgs[j].getBytes().length);
      buffer.put(aArgs[j].getBytes(), 0, aArgs[j].getBytes().length);
    }

    buffer.put("*GO*".getBytes(), 0, "*GO*".getBytes().length);

    buffer.flip();
  }

  private void createLogger(String[] args) throws MPJRuntimeException {
  
    if(logger == null) {

      DailyRollingFileAppender fileAppender = null ;