iotjava/iotruntime/slave/IoTSlave.java

   1 package iotruntime.slave;
   2
   3 import iotruntime.*;
   4 import iotruntime.zigbee.*;
   5 import iotruntime.messages.*;
   6 import iotruntime.master.RuntimeOutput;
   7
   8 // Java packages
   9 import java.io.File;
  10 import java.io.FileInputStream;
  11 import java.io.FileOutputStream;
  12 import java.io.ObjectInputStream;
  13 import java.io.ObjectOutputStream;
  14 import java.io.InputStream;
  15 import java.io.OutputStream;
  16 import java.io.IOException;
  17 import java.io.FileNotFoundException;
  18 import java.lang.ClassNotFoundException;
  19 import java.lang.Class;
  20 import java.lang.reflect.*;
  21 import java.lang.ClassLoader;
  22 import java.net.InetAddress;
  23 import java.net.Socket;
  24 import java.net.UnknownHostException;
  25 import java.net.URL;
  26 import java.net.URLClassLoader;
  27 import java.rmi.registry.LocateRegistry;
  28 import java.rmi.registry.Registry;
  29 import java.rmi.Remote;
  30 import java.rmi.RemoteException;
  31 import java.rmi.AlreadyBoundException;
  32 import java.rmi.NotBoundException;
  33 import java.rmi.server.UnicastRemoteObject;
  34 import java.util.Arrays;
  35 import java.util.Properties;
  36 import java.util.HashMap;
  37 import java.util.Map;
  38
  39 // Zip/Unzip utility
  40 import net.lingala.zip4j.exception.ZipException;
  41 import net.lingala.zip4j.core.ZipFile;
  42
  43 /** Class IoTSlave is run by IoTMaster on a different JVM's.
  44  *  It needs to respond to IoTMaster's commands
  45  *
  46  * @author      Rahmadi Trimananda <rahmadi.trimananda @ uci.edu>
  47  * @version     1.0
  48  * @since       2016-06-16
  49  */
  50 public class IoTSlave {
  51
  52         /**
  53          * IoTSlave class properties
  54          */
  55         private Message sIoTMasterMsg;
  56         private String sIoTMasterHostAdd;
  57         private String sMainObjectName;
  58         private int iComPort;
  59         private int iRMIRegPort;
  60         private int iRMIStubPort;
  61         private String strFieldName;
  62         private Class<?> clsMain;
  63         private Object objMainCls;
  64         private Object iRelFirstObject;
  65         private Object iRelSecondObject;
  66         private Socket socket;
  67         private ObjectOutputStream outStream;
  68         private ObjectInputStream inStream;
  69         private Map<String,Object> mapObjNameStub;
  70
  71         /**
  72          * IoTSet object, e.g. IoTSet<ProximitySensor> proximity_sensors;
  73          * IoTRelation object, e.g. IoTRelation<ProximitySensor, LightBulb> ps_lb_relation;
  74          */
  75         private ISet<Object> isetObject;
  76         private IoTSet<Object> iotsetObject;
  77         private IRelation<Object,Object> irelObject;
  78         private IoTRelation<Object,Object> iotrelObject;
  79
  80         // Constants that are to be extracted from config file
  81         private static String STR_JAR_FILE_PATH;
  82         private static String STR_OBJ_CLS_PFX;
  83         private static String STR_INTERFACE_PFX;
  84         private static String SKEL_CLASS_SUFFIX;
  85         private static String STUB_CLASS_SUFFIX;
  86         private static boolean BOOL_VERBOSE;
  87         private static boolean CAPAB_BASED_RMI;
  88
  89         /**
  90          * IoTSlave class constants - not to be changed by users
  91          */
  92         private static final String STR_IOT_SLAVE_NAME = "IoTSlave";
  93         private static final String STR_CFG_FILE_EXT = ".config";
  94         private static final String STR_CLS_FILE_EXT = ".class";
  95         private static final String STR_JAR_FILE_EXT = ".jar";
  96         private static final String STR_ZIP_FILE_EXT = ".zip";
  97         private static final String STR_UNZIP_DIR = "./";
  98         private static final Class<?>[] STR_URL_PARAM = new Class[] {URL.class };
  99         private static final String STR_YES = "Yes";
 100         private static final String STR_NO = "No";
 101
 102         /**
 103          * Class constructor
 104          *
 105          */
 106         public IoTSlave(String[] argInp) {
 107
 108                 sIoTMasterMsg = null;
 109                 sIoTMasterHostAdd = argInp[0];
 110                 iComPort = Integer.parseInt(argInp[1]);
 111                 iRMIRegPort = Integer.parseInt(argInp[2]);
 112                 iRMIStubPort = Integer.parseInt(argInp[3]);
 113                 sMainObjectName = null;
 114                 strFieldName = null;
 115                 clsMain = null;
 116                 objMainCls = null;
 117                 isetObject = null;
 118                 iotsetObject = null;
 119                 irelObject = null;
 120                 iotrelObject = null;
 121                 iRelFirstObject = null;
 122                 iRelSecondObject = null;
 123                 socket = null;
 124                 outStream = null;
 125                 inStream = null;
 126                 mapObjNameStub = new HashMap<String,Object>();
 127
 128                 STR_JAR_FILE_PATH = null;
 129                 STR_OBJ_CLS_PFX = null;
 130                 STR_INTERFACE_PFX = null;
 131                 SKEL_CLASS_SUFFIX = null;
 132                 STUB_CLASS_SUFFIX = null;
 133                 BOOL_VERBOSE = false;
 134                 CAPAB_BASED_RMI = false;
 135         }
 136
 137         /**
 138          * A method to initialize constants from config file
 139          *
 140          * @return void
 141          */
 142         private void parseIoTSlaveConfigFile() {
 143                 // Parse configuration file
 144                 Properties prop = new Properties();
 145                 String strCfgFileName = STR_IOT_SLAVE_NAME + STR_CFG_FILE_EXT;
 146                 File file = new File(strCfgFileName);
 147                 try {
 148                         FileInputStream fis = new FileInputStream(file);
 149                         prop.load(fis);
 150                 } catch (IOException ex) {
 151                         System.out.println("IoTMaster: Error reading config file: " + strCfgFileName);
 152                         ex.printStackTrace();
 153                 }
 154                 System.out.println("IoTMaster: Extracting information from config file: " + strCfgFileName);
 155                 // Initialize constants from config file
 156                 STR_JAR_FILE_PATH = prop.getProperty("JAR_FILE_PATH");
 157                 STR_OBJ_CLS_PFX = prop.getProperty("OBJECT_CLASS_PREFIX");
 158                 STR_INTERFACE_PFX = prop.getProperty("INTERFACE_PREFIX");
 159                 SKEL_CLASS_SUFFIX = prop.getProperty("SKEL_CLASS_SUFFIX");
 160                 STUB_CLASS_SUFFIX = prop.getProperty("STUB_CLASS_SUFFIX");
 161                 if (prop.getProperty("VERBOSE").equals(STR_YES)) {
 162                         BOOL_VERBOSE = true;
 163                 }
 164                 if (prop.getProperty("CAPAB_BASED_RMI").equals(STR_YES)) {
 165                         CAPAB_BASED_RMI = true;
 166                 }
 167
 168                 System.out.println("JAR_FILE_PATH=" + STR_JAR_FILE_PATH);
 169                 System.out.println("OBJECT_CLASS_PREFIX=" + STR_OBJ_CLS_PFX);
 170                 System.out.println("INTERFACE_PREFIX=" + STR_INTERFACE_PFX);
 171                 System.out.println("SKEL_CLASS_SUFFIX=" + SKEL_CLASS_SUFFIX);
 172                 System.out.println("STUB_CLASS_SUFFIX=" + STUB_CLASS_SUFFIX);
 173                 System.out.println("CAPAB_BASED_RMI=" + CAPAB_BASED_RMI);
 174                 System.out.println("IoTMaster: Information extracted successfully!");
 175         }
 176
 177         /**
 178          * Adds the content pointed by the URL to the classpath dynamically at runtime (hack!!!)
 179          *
 180          * @param  url         the URL pointing to the content to be added
 181          * @throws IOException
 182          * @see    <a href="http://stackoverflow.com/questions/60764/how-should-i-load-jars-dynamically-at-runtime</a>
 183          */
 184         private static void addURL(URL url) throws IOException {
 185
 186                 URLClassLoader sysloader = (URLClassLoader)ClassLoader.getSystemClassLoader();
 187                 Class<?> sysclass = URLClassLoader.class;
 188
 189                 try {
 190
 191                         Method method = sysclass.getDeclaredMethod("addURL", STR_URL_PARAM);
 192                         method.setAccessible(true);
 193                         method.invoke(sysloader,new Object[] { url });
 194
 195                 } catch (Throwable t) {
 196
 197                         t.printStackTrace();
 198                         throw new IOException("IoTSlave: Could not add URL to system classloader!");
 199                 }
 200         }
 201
 202         /**
 203          * A private method to create object
 204          *
 205          * @return  void
 206          */
 207         private void createCapabBasedRMIJava(MessageCreateObject sMessage) throws
 208                 ClassNotFoundException, NoSuchMethodException, UnknownHostException {
 209
 210                 // TODO: DEBUG
 211                 System.out.println("\n\nDEBUG: Create capab based RMI here!");
 212                 System.out.println("DEBUG: sMessage host address: " + sMessage.getHostAddress());
 213                 System.out.println("DEBUG: sMessage object class: " + sMessage.getObjectClass());
 214                 System.out.println("DEBUG: sMessage object name: " + sMessage.getObjectName());
 215                 System.out.println("DEBUG: sMessage interface name: " + sMessage.getObjectInterfaceName());
 216                 System.out.println("DEBUG: sMessage reg port: " + sMessage.getRMIRegPort());
 217                 System.out.println("DEBUG: sMessage stub port: " + sMessage.getRMIStubPort());
 218                 System.out.println("DEBUG: sMessage object fields: " + Arrays.toString(sMessage.getObjectFields()));
 219                 System.out.println("DEBUG: sMessage object fields: " + Arrays.toString(sMessage.getObjectFldCls()));
 220                 System.out.println("\n\n");
 221
 222                 // Instantiate the skeleton and put in the object
 223                 String strObjSkelName = STR_OBJ_CLS_PFX + "." + sMessage.getObjectClass() +
 224                                                                         "." + sMessage.getObjectInterfaceName() + SKEL_CLASS_SUFFIX;
 225                 RuntimeOutput.print("IoTSlave: Skeleton object: " + strObjSkelName, BOOL_VERBOSE);
 226                 Class<?> clsSkel = Class.forName(strObjSkelName);
 227                 Class<?> clsInt = Class.forName(STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX +
 228                         "." + sMessage.getObjectInterfaceName());
 229                 Class[] clsSkelParams = { clsInt, String.class, int.class };    // Port number is integer
 230                 Constructor<?> objSkelCons = clsSkel.getDeclaredConstructor(clsSkelParams);
 231                 String callbackAddress = InetAddress.getLocalHost().getHostAddress();   // Callback address is this machine's address
 232                 Object objSkelParams[] = { objMainCls, callbackAddress, iRMIStubPort };
 233                 // Create a new thread for each skeleton
 234                 Thread objectThread = new Thread(new Runnable() {
 235                         public void run() {
 236                                 try {
 237                                         Object objSkel = objSkelCons.newInstance(objSkelParams);
 238                                 } catch (InstantiationException |
 239                                                  IllegalAccessException |
 240                                                  InvocationTargetException ex) {
 241                                         ex.printStackTrace();
 242                                 }
 243                         }
 244                 });
 245                 objectThread.start();
 246                 RuntimeOutput.print("IoTSlave: Done generating object!", BOOL_VERBOSE);
 247         }
 248
 249         /**
 250          * A private method to create object
 251          *
 252          * @return  void
 253          */
 254         private void createObject() throws IOException,
 255                 ClassNotFoundException, NoSuchMethodException, InstantiationException,
 256                         RemoteException, AlreadyBoundException, IllegalAccessException,
 257                                 InvocationTargetException {
 258
 259                 // TODO: DEBUG
 260                 System.out.println("\n\nDEBUG: CREATE DRIVER OBJECT!!!\n\n");
 261
 262                 // Translating into the actual Message class
 263                 MessageCreateObject sMessage = (MessageCreateObject) sIoTMasterMsg;
 264                 // Instantiate object using reflection
 265                 String strObjClassName = STR_OBJ_CLS_PFX + "." + sMessage.getObjectClass() +
 266                                                                                                                  "." + sMessage.getObjectClass();
 267                 File file = new File(STR_JAR_FILE_PATH + sMessage.getObjectClass() + STR_JAR_FILE_EXT);
 268                 RuntimeOutput.print("IoTSlave: DEBUG print path: " + STR_JAR_FILE_PATH +
 269                                                                                          sMessage.getObjectClass() + STR_JAR_FILE_EXT, BOOL_VERBOSE);
 270                 addURL(file.toURI().toURL());
 271                 clsMain = Class.forName(strObjClassName);
 272                 Class[] clsParams = sMessage.getObjectFldCls();
 273                 Constructor<?> ct = clsMain.getDeclaredConstructor(clsParams);
 274                 Object objParams[] = sMessage.getObjectFields();
 275                 objMainCls = ct.newInstance(objParams);
 276                 RuntimeOutput.print("IoTSlave: Creating RMI skeleton: " +
 277                         sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 278                         " with RMI stub port: " + iRMIStubPort, BOOL_VERBOSE);
 279                 if (CAPAB_BASED_RMI) {
 280                 // Use the new capability-based RMI in Java
 281                         createCapabBasedRMIJava(sMessage);
 282                 } else {
 283                         // Register object to RMI - there are 2 ports: RMI registry port and RMI stub port
 284                         Object objStub = (Object)
 285                                 UnicastRemoteObject.exportObject((Remote) objMainCls, iRMIStubPort);
 286                         Registry registry = LocateRegistry.createRegistry(iRMIRegPort);
 287                         registry.bind(sMessage.getObjectName(), (Remote) objStub);
 288                 }
 289                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 290                 RuntimeOutput.print("IoTSlave: Registering object via RMI!", BOOL_VERBOSE);
 291
 292         }
 293
 294
 295         /**
 296          * A private method to transfer file
 297          *
 298          * @return  void
 299          */
 300         private void transferFile() throws IOException,
 301                 UnknownHostException, FileNotFoundException {
 302
 303                 // Translating into the actual Message class
 304                 MessageSendFile sMessage = (MessageSendFile) sIoTMasterMsg;
 305
 306                 // Send back the received message as acknowledgement
 307                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 308
 309                 // Write file to the current location
 310                 Socket filesocket = new Socket(sIoTMasterHostAdd, iComPort);
 311                 InputStream inFileStream = filesocket.getInputStream();
 312                 OutputStream outFileStream = new FileOutputStream(sMessage.getFileName());
 313                 byte[] bytFile = new byte[Math.toIntExact(sMessage.getFileSize())];
 314
 315                 int iCount = 0;
 316                 while ((iCount = inFileStream.read(bytFile)) > 0) {
 317                         outFileStream.write(bytFile, 0, iCount);
 318                 }
 319                 // Unzip if this is a zipped file
 320                 if (sMessage.getFileName().contains(STR_ZIP_FILE_EXT)) {
 321                         RuntimeOutput.print("IoTSlave: Unzipping file: " + sMessage.getFileName(), BOOL_VERBOSE);
 322                         try {
 323                                 ZipFile zipFile = new ZipFile(sMessage.getFileName());
 324                                 zipFile.extractAll(STR_UNZIP_DIR);
 325                         } catch (ZipException ex) {
 326                                 System.out.println("IoTSlave: Error in unzipping file!");
 327                                 ex.printStackTrace();
 328                         }
 329                 }
 330                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 331                 RuntimeOutput.print("IoTSlave: Receiving file transfer!", BOOL_VERBOSE);
 332         }
 333
 334         /**
 335          * A private method to create a main object
 336          *
 337          * @return  void
 338          */
 339         private void createMainObject() throws IOException,
 340                 ClassNotFoundException, InstantiationException, IllegalAccessException,
 341                         InvocationTargetException {
 342
 343                 // Translating into the actual Message class
 344                 MessageCreateMainObject sMessage = (MessageCreateMainObject) sIoTMasterMsg;
 345
 346                 // TODO: DEBUG
 347                 System.out.println("\n\nDEBUG: CREATE MAIN OBJECT!!!");
 348                 System.out.println("DEBUG: sMessage object name: " + sMessage.getObjectName());
 349
 350                 // Getting controller class
 351                 File file = new File(STR_JAR_FILE_PATH + sMessage.getObjectName() + STR_JAR_FILE_EXT);
 352                 RuntimeOutput.print("IoTSlave: DEBUG print path: " + STR_JAR_FILE_PATH +
 353                                                                                          sMessage.getObjectName() + STR_JAR_FILE_EXT, BOOL_VERBOSE);
 354                 addURL(file.toURI().toURL());
 355                 // We will always have a package name <object name>.<object name>
 356                 // e.g. SmartLightsController.SmartLightsController
 357                 sMainObjectName = sMessage.getObjectName();
 358                 clsMain = Class.forName(sMainObjectName + "." + sMainObjectName);
 359                 objMainCls = clsMain.newInstance();
 360
 361                 // Send back the received message as acknowledgement
 362                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 363                 RuntimeOutput.print("IoTSlave: Instantiating main controller/device class "
 364                                                                                          + sMessage.getObjectName(), BOOL_VERBOSE);
 365
 366         }
 367
 368         /**
 369          * A private method to create a new IoTSet
 370          *
 371          * @return  void
 372          */
 373         private void createNewIoTSet() throws IOException {
 374
 375                 // Translating into the actual Message class
 376                 MessageCreateSetRelation sMessage = (MessageCreateSetRelation) sIoTMasterMsg;
 377
 378                 // TODO: DEBUG
 379                 System.out.println("\n\nDEBUG: CREATE NEW IOT SET!!!");
 380                 System.out.println("DEBUG: sMessage object field name: " + sMessage.getObjectFieldName());
 381
 382                 // Initialize field name
 383                 strFieldName = sMessage.getObjectFieldName();
 384                 RuntimeOutput.print("IoTSlave: Setting up field " + strFieldName, BOOL_VERBOSE);
 385
 386                 // Creating a new IoTSet object
 387                 isetObject = new ISet<Object>();
 388
 389                 // Send back the received message as acknowledgement
 390                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 391                 RuntimeOutput.print("IoTSlave: Creating a new IoTSet object!", BOOL_VERBOSE);
 392
 393         }
 394
 395         /**
 396          * A private method to create a new IoTRelation
 397          *
 398          * @return  void
 399          */
 400         private void createNewIoTRelation() throws IOException {
 401
 402                 // Translating into the actual Message class
 403                 MessageCreateSetRelation sMessage = (MessageCreateSetRelation) sIoTMasterMsg;
 404
 405                 // TODO: DEBUG
 406                 System.out.println("\n\nDEBUG: CREATE NEW IOT RELATION!!!");
 407                 System.out.println("DEBUG: sMessage object field name: " + sMessage.getObjectFieldName());
 408
 409                 // Initialize field name
 410                 strFieldName = sMessage.getObjectFieldName();
 411                 RuntimeOutput.print("IoTSlave: Setting up field " + strFieldName, BOOL_VERBOSE);
 412
 413                 // Creating a new IoTRelation object
 414                 irelObject = new IRelation<Object,Object>();
 415
 416                 // Send back the received message as acknowledgement
 417                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 418                 RuntimeOutput.print("IoTSlave: Creating a new IoTRelation object!", BOOL_VERBOSE);
 419
 420         }
 421
 422         /**
 423          * A private method to get an object from the registry
 424          *
 425          * @return  Object
 426          */
 427         private Object getObjectFromRegistry() throws RemoteException,
 428                         ClassNotFoundException, NotBoundException {
 429
 430                 // Translating into the actual Message class
 431                 MessageGetObject sMessage = (MessageGetObject) sIoTMasterMsg;
 432
 433                 // Locate RMI registry and add object into IoTSet
 434                 Registry registry =
 435                         LocateRegistry.getRegistry(sMessage.getHostAddress(), sMessage.getRMIRegPort());
 436                 RuntimeOutput.print("IoTSlave: Looking for RMI registry: " +
 437                         sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 438                         " with RMI stub port: " + sMessage.getRMIStubPort(), BOOL_VERBOSE);
 439                 Object stubObj = registry.lookup(sMessage.getObjectName());
 440                 RuntimeOutput.print("IoTSlave: Looking for object name: " + sMessage.getObjectName(), BOOL_VERBOSE);
 441
 442                 // Class conversion to interface class of this class,
 443                 // e.g. ProximitySensorImpl has ProximitySensor interface
 444                 String strObjClassInterfaceName = STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX + "." +
 445                         sMessage.getObjectInterfaceName();
 446                 Class<?> clsInf = Class.forName(strObjClassInterfaceName);
 447                 Object stubObjConv = clsInf.cast(stubObj);
 448
 449                 return stubObjConv;
 450         }
 451
 452         /**
 453          * A private method to get an object and create a stub
 454          * <p>
 455          * This is using the capability-based RMI skeleton and stub scheme
 456          *
 457          * @return  Object
 458          */
 459         private Object getObjectFromStub() throws RemoteException,
 460                         ClassNotFoundException, NoSuchMethodException, InstantiationException,
 461                         IllegalAccessException, NotBoundException, InvocationTargetException, UnknownHostException {
 462
 463                 // Translating into the actual Message class
 464                 MessageGetObject sMessage = (MessageGetObject) sIoTMasterMsg;
 465
 466                 System.out.println("DEBUG: sMessage host address: " + sMessage.getHostAddress());
 467                 System.out.println("DEBUG: sMessage object class: " + sMessage.getObjectClass());
 468                 System.out.println("DEBUG: sMessage object name: " + sMessage.getObjectName());
 469                 System.out.println("DEBUG: sMessage interface name: " + sMessage.getObjectInterfaceName());
 470                 System.out.println("DEBUG: sMessage reg port: " + sMessage.getRMIRegPort());
 471                 System.out.println("DEBUG: sMessage stub port: " + sMessage.getRMIStubPort());
 472                 System.out.println("DEBUG: sMessage callback ports: " + Arrays.toString(sMessage.getRMICallbackPorts()));
 473                 System.out.println("\n\n");
 474
 475                 Object stubObjConv = null;
 476                 String strObjectName = sMessage.getObjectName();
 477                 String strObjClassInterfaceName = STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX + "." +
 478                         sMessage.getObjectStubInterfaceName();
 479                 Class<?> clsInf = Class.forName(strObjClassInterfaceName);
 480                 if (mapObjNameStub.containsKey(strObjectName)) {
 481                         RuntimeOutput.print("IoTSlave: Getting back object on slave: " + strObjectName, BOOL_VERBOSE);
 482                         stubObjConv = clsInf.cast(mapObjNameStub.get(strObjectName));
 483                 } else {
 484                         // Instantiate the stub and put in the object
 485                         String strObjStubName = sMainObjectName + "." + sMessage.getObjectStubInterfaceName() + STUB_CLASS_SUFFIX;
 486                         Class<?> clsStub = Class.forName(strObjStubName);       // Port number is integer
 487                         Class[] clsStubParams = { int.class, String.class, String.class, int.class, int[].class };
 488                         Constructor<?> objStubCons = clsStub.getDeclaredConstructor(clsStubParams);
 489                         Integer[] portsInteger = sMessage.getRMICallbackPorts();
 490                         int[] ports = Arrays.stream(portsInteger).mapToInt(Integer::intValue).toArray();
 491
 492                         int rev = 0;
 493                         String callbackAddress = InetAddress.getLocalHost().getHostAddress();   // Callback address is this machine's address
 494                         Object objStubParams[] = { sMessage.getRMIStubPort(), sMessage.getHostAddress(), callbackAddress,
 495                                                                                 rev, ports };
 496                         RuntimeOutput.print("IoTSlave: Creating RMI stub: " +
 497                                 sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 498                                 " with callback address: " + callbackAddress + " and RMI stub port: " + sMessage.getRMIStubPort(), BOOL_VERBOSE);
 499                         Object stubObj = objStubCons.newInstance(objStubParams);
 500                         // Class conversion to interface class of this class,
 501                         // e.g. ProximitySensorImpl has ProximitySensor interface
 502                         RuntimeOutput.print("IoTSlave: Registering new stub object: " + strObjectName, BOOL_VERBOSE);
 503                         mapObjNameStub.put(strObjectName, stubObj);
 504                         stubObjConv = clsInf.cast(stubObj);
 505                 }
 506
 507                 return stubObjConv;
 508         }
 509
 510         /**
 511          * A private method to get an IoTSet object
 512          *
 513          * @return  void
 514          */
 515         private void getIoTSetObject() throws IOException,
 516                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 517                 InstantiationException, IllegalAccessException, InvocationTargetException {
 518
 519                 // TODO: DEBUG
 520                 System.out.println("\n\nDEBUG: GET IOT SET OBJECT!!!");
 521
 522                 Object objRegistry = null;
 523                 if (CAPAB_BASED_RMI)
 524                         objRegistry = getObjectFromStub();
 525                 else
 526                         objRegistry = getObjectFromRegistry();
 527                 isetObject.add(objRegistry);
 528                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 529
 530                 // Send back the received message as acknowledgement
 531                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 532                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 533         }
 534
 535         /**
 536          * A private method to get an IoTRelation first object
 537          *
 538          * @return  void
 539          */
 540         private void getIoTRelationFirstObject() throws IOException,
 541                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 542                 InstantiationException, IllegalAccessException, InvocationTargetException {
 543
 544                 // TODO: DEBUG
 545                 System.out.println("\n\nDEBUG: GET IOT RELATION FIRST OBJECT!!!");
 546
 547                 Object objRegistry = null;
 548                 if (CAPAB_BASED_RMI)
 549                         objRegistry = getObjectFromStub();
 550                 else
 551                         objRegistry = getObjectFromRegistry();
 552                 iRelFirstObject = objRegistry;
 553
 554                 // Send back the received message as acknowledgement
 555                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 556                 RuntimeOutput.print("IoTSlave: Getting a first object for IoTRelation!", BOOL_VERBOSE);
 557
 558         }
 559
 560         /**
 561          * A private method to get an IoTRelation second object
 562          *
 563          * @return  void
 564          */
 565         private void getIoTRelationSecondObject() throws IOException,
 566                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 567                 InstantiationException, IllegalAccessException, InvocationTargetException {
 568
 569                 // TODO: DEBUG
 570                 System.out.println("\n\nDEBUG: GET IOT RELATION SECOND OBJECT!!!");
 571
 572                 Object objRegistry = null;
 573                 if (CAPAB_BASED_RMI)
 574                         objRegistry = getObjectFromStub();
 575                 else
 576                         objRegistry = getObjectFromRegistry();
 577                 iRelSecondObject = objRegistry;
 578
 579                 // Now add the first and the second object into IoTRelation
 580                 irelObject.put(iRelFirstObject, iRelSecondObject);
 581                 RuntimeOutput.print("IoTSlave: This IoTRelation now has: " + irelObject.size() + " entry(s)", BOOL_VERBOSE);
 582
 583                 // Send back the received message as acknowledgement
 584                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 585                 RuntimeOutput.print("IoTSlave: Getting a second object for IoTRelation!", BOOL_VERBOSE);
 586
 587         }
 588
 589         /**
 590          * A private method to reinitialize IoTSet field
 591          *
 592          * @return  void
 593          */
 594         private void reinitializeIoTSetField() throws IOException,
 595                 IllegalAccessException, NoSuchFieldException {
 596
 597                 // Reinitialize IoTSet field after getting all the objects
 598                 iotsetObject = new IoTSet<Object>(isetObject.values());
 599
 600                 // TODO: DEBUG
 601                 System.out.println("\n\nDEBUG: REINITIALIZE IOT SET FIELD!!!");
 602                 System.out.println("DEBUG: Field name: " + strFieldName + "\n\n");
 603
 604                 // Private fields need getDeclaredField(), while public fields use getField()
 605                 Field fld = clsMain.getDeclaredField(strFieldName);
 606                 boolean bAccess = fld.isAccessible();
 607                 fld.setAccessible(true);
 608                 fld.set(objMainCls, iotsetObject);
 609                 fld.setAccessible(bAccess);
 610                 RuntimeOutput.print("IoTSlave: Reinitializing field " + strFieldName, BOOL_VERBOSE);
 611
 612                 // Send back the received message as acknowledgement
 613                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 614                 RuntimeOutput.print("IoTSlave: Reinitializing IoTSet field!", BOOL_VERBOSE);
 615
 616         }
 617
 618         /**
 619          * A private method to reinitialize IoTRelation field
 620          *
 621          * @return  void
 622          */
 623         private void reinitializeIoTRelationField() throws IOException,
 624                 IllegalAccessException, NoSuchFieldException {
 625
 626                 // Reinitialize IoTSet field after getting all the objects
 627                 iotrelObject = new IoTRelation<Object,Object>(irelObject.relationMap(), irelObject.size());
 628
 629                 // TODO: DEBUG
 630                 System.out.println("\n\nDEBUG: REINITIALIZE IOT RELATION FIELD!!!");
 631                 System.out.println("DEBUG: Field name: " + strFieldName + "\n\n");
 632
 633                 // Private fields need getDeclaredField(), while public fields use getField()
 634                 Field fld = clsMain.getDeclaredField(strFieldName);
 635                 boolean bAccess = fld.isAccessible();
 636                 fld.setAccessible(true);
 637                 fld.set(objMainCls, iotrelObject);
 638                 fld.setAccessible(bAccess);
 639                 RuntimeOutput.print("IoTSlave: Reinitializing field " + strFieldName, BOOL_VERBOSE);
 640
 641                 // Send back the received message as acknowledgement
 642                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 643                 RuntimeOutput.print("IoTSlave: Reinitializing IoTRelation field!", BOOL_VERBOSE);
 644
 645         }
 646
 647         /**
 648          * A private method to get the device driver object's IoTSet
 649          * <p>
 650          * This is to handle device driver's IoTSet that contains IP addresses
 651          *
 652          * @return  void
 653          */
 654         private void getDeviceIoTSetObject() throws IOException {
 655
 656                 // Translating into the actual Message class
 657                 MessageGetDeviceObject sMessage = (MessageGetDeviceObject) sIoTMasterMsg;
 658
 659                 // TODO: DEBUG
 660                 System.out.println("\n\nDEBUG: GET DEVICE IOT SET OBJECT!!!");
 661                 System.out.println("DEBUG: sMessage host address: " + sMessage.getHostAddress());
 662                 System.out.println("DEBUG: sMessage source port: " + sMessage.getSourceDeviceDriverPort());
 663                 System.out.println("DEBUG: sMessage destination port: " + sMessage.getDestinationDeviceDriverPort());
 664                 System.out.println("DEBUG: sMessage source wild card: " + sMessage.isSourcePortWildCard());
 665                 System.out.println("DEBUG: sMessage desination wild card: " + sMessage.isDestinationPortWildCard() + "\n\n");
 666
 667                 // Get IoTSet objects for IP address set on device driver/controller
 668                 IoTDeviceAddress objDeviceAddress = new IoTDeviceAddress(sMessage.getHostAddress(),
 669                         sMessage.getSourceDeviceDriverPort(),
 670                         sMessage.getDestinationDeviceDriverPort(),
 671                         sMessage.isSourcePortWildCard(),
 672                         sMessage.isDestinationPortWildCard());
 673                 RuntimeOutput.print("IoTSlave: Device address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 674                 isetObject.add(objDeviceAddress);
 675                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 676
 677                 // Send back the received message as acknowledgement
 678                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 679                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 680
 681         }
 682
 683         /**
 684          * A private method to get the device driver object's IoTSet for IoTZigbeeAddress
 685          * <p>
 686          * This is to handle device driver's IoTSet that contains Zigbee addresses
 687          *
 688          * @return  void
 689          */
 690         private void getZBDevIoTSetObject() throws IOException {
 691
 692                 // Translating into the actual Message class
 693                 MessageGetSimpleDeviceObject sMessage = (MessageGetSimpleDeviceObject) sIoTMasterMsg;
 694
 695                 // TODO: DEBUG
 696                 System.out.println("\n\nDEBUG: GET ZIGBEE DEVICE IOT SET OBJECT!!!");
 697                 System.out.println("DEBUG: sMessage host address: " + sMessage.getHostAddress() + "\n\n");
 698
 699                 // Get IoTSet objects for IP address set on device driver/controller
 700                 IoTZigbeeAddress objZBDevAddress = new IoTZigbeeAddress(sMessage.getHostAddress());
 701                 RuntimeOutput.print("IoTSlave: Device address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 702                 isetObject.add(objZBDevAddress);
 703                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 704
 705                 // Send back the received message as acknowledgement
 706                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 707                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 708
 709         }
 710
 711
 712         /**
 713          * A private method to get IoTAddress objects for IoTSet
 714          *
 715          * @return  void
 716          */
 717         private void getAddIoTSetObject() throws IOException {
 718
 719                 // Translating into the actual Message class
 720                 MessageGetSimpleDeviceObject sMessage = (MessageGetSimpleDeviceObject) sIoTMasterMsg;
 721
 722                 // TODO: DEBUG
 723                 System.out.println("\n\nDEBUG: GET ADD IOT SET OBJECT!!!");
 724                 System.out.println("DEBUG: sMessage host address: " + sMessage.getHostAddress() + "\n\n");
 725
 726                 // Get IoTSet objects for IP address set on device driver/controller
 727                 IoTAddress objAddress = new IoTAddress(sMessage.getHostAddress());
 728                 RuntimeOutput.print("IoTSlave: Address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 729                 isetObject.add(objAddress);
 730                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 731                 // Send back the received message as acknowledgement
 732                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 733                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 734
 735         }
 736
 737         /**
 738          * A private method to invoke init() method in the controller object
 739          *
 740          * @return  void
 741          */
 742         private void invokeInitMethod() throws IOException {
 743
 744                 // TODO: DEBUG
 745                 System.out.println("\n\nDEBUG: INVOKE INIT METHOD!!!\n\n");
 746
 747                 new Thread() {
 748                         public void run() {
 749                                 try {
 750                                         Class<?> noparams[] = {};
 751                                         Method method = clsMain.getDeclaredMethod("init", noparams);
 752                                         method.invoke(objMainCls);
 753                                 } catch (NoSuchMethodException  |
 754                                                  IllegalAccessException |
 755                                                  InvocationTargetException ex) {
 756                                         System.out.println("IoTSlave: Exception: "
 757                                                  + ex.getMessage());
 758                                         ex.printStackTrace();
 759                                 }
 760                         }
 761                 }.start();
 762
 763                 // Start a new thread to invoke the init function
 764                 RuntimeOutput.print("IoTSlave: Invoke init method! Job done!", BOOL_VERBOSE);
 765
 766                 // Send back the received message as acknowledgement
 767                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 768
 769         }
 770
 771         /**
 772          * A public method to do communication with IoTMaster
 773          *
 774          * @params  iIndex  Integer index
 775          * @return  void
 776          */
 777         public void commIoTMaster() {
 778
 779                 try {
 780
 781                         // Loop, receive and process commands from IoTMaster
 782                         socket = new Socket(sIoTMasterHostAdd, iComPort);
 783                         outStream = new ObjectOutputStream(socket.getOutputStream());
 784                         inStream = new ObjectInputStream(socket.getInputStream());
 785
 786                         LOOP:
 787                         while(true) {
 788                                 // Get the first payload
 789                                 RuntimeOutput.print("IoTSlave: Slave waiting...", BOOL_VERBOSE);
 790                                 sIoTMasterMsg = (Message) inStream.readObject();
 791
 792                                 // Check payload message from IoTMaster and make a decision
 793                                 switch (sIoTMasterMsg.getMessage()) {
 794
 795                                 case CREATE_OBJECT:
 796                                         createObject();
 797                                         break;
 798
 799                                 case TRANSFER_FILE:
 800                                         transferFile();
 801                                         break;
 802
 803                                 case CREATE_MAIN_OBJECT:
 804                                         createMainObject();
 805                                         break;
 806
 807                                 case CREATE_NEW_IOTSET:
 808                                         createNewIoTSet();
 809                                         break;
 810
 811                                 case CREATE_NEW_IOTRELATION:
 812                                         createNewIoTRelation();
 813                                         break;
 814
 815                                 case GET_IOTSET_OBJECT:
 816                                         getIoTSetObject();
 817                                         break;
 818
 819                                 case GET_IOTRELATION_FIRST_OBJECT:
 820                                         getIoTRelationFirstObject();
 821                                         break;
 822
 823                                 case GET_IOTRELATION_SECOND_OBJECT:
 824                                         getIoTRelationSecondObject();
 825                                         break;
 826
 827                                 case REINITIALIZE_IOTSET_FIELD:
 828                                         reinitializeIoTSetField();
 829                                         break;
 830
 831                                 case REINITIALIZE_IOTRELATION_FIELD:
 832                                         reinitializeIoTRelationField();
 833                                         break;
 834
 835                                 case GET_DEVICE_IOTSET_OBJECT:
 836                                         getDeviceIoTSetObject();
 837                                         break;
 838
 839                                 case GET_ZB_DEV_IOTSET_OBJECT:
 840                                         getZBDevIoTSetObject();
 841                                         break;
 842
 843                                 case GET_ADD_IOTSET_OBJECT:
 844                                         getAddIoTSetObject();
 845                                         break;
 846
 847                                 case INVOKE_INIT_METHOD:
 848                                         invokeInitMethod();
 849                                         break;
 850
 851                                 case END_SESSION:
 852                                         // END of session
 853                                         break LOOP;
 854
 855                                 default:
 856                                         break;
 857                                 }
 858                         }
 859                         RuntimeOutput.print("IoTSlave: Session ends!", BOOL_VERBOSE);
 860
 861                         // Closing streams and end session
 862                         outStream.close();
 863                         inStream.close();
 864                         socket.close();
 865                         RuntimeOutput.print("IoTSlave: Closing!", BOOL_VERBOSE);
 866                         // We have to continuously loop because we are preserving our stubs and skeletons
 867                         //while(true) { }
 868
 869                 } catch (IOException               |
 870                                  ClassNotFoundException    |
 871                                  NoSuchMethodException     |
 872                                  InstantiationException    |
 873                                  AlreadyBoundException     |
 874                                  IllegalAccessException    |
 875                                  InvocationTargetException |
 876                                  NotBoundException         |
 877                                  NoSuchFieldException ex) {
 878                         System.out.println("IoTSlave: Exception: "
 879                                  + ex.getMessage());
 880                         ex.printStackTrace();
 881                 }
 882         }
 883
 884         public static void main(String args[]) {
 885                 IoTSlave iotSlave = new IoTSlave(args);
 886                 iotSlave.parseIoTSlaveConfigFile();
 887                 iotSlave.commIoTMaster();
 888         }
 889 }