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 final 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                 // Instantiate the skeleton and put in the object
 211                 String strObjSkelName = STR_OBJ_CLS_PFX + "." + sMessage.getObjectClass() +
 212                                                                         "." + sMessage.getObjectInterfaceName() + SKEL_CLASS_SUFFIX;
 213                 RuntimeOutput.print("IoTSlave: Skeleton object: " + strObjSkelName, BOOL_VERBOSE);
 214                 Class<?> clsSkel = Class.forName(strObjSkelName);
 215                 Class<?> clsInt = Class.forName(STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX +
 216                         "." + sMessage.getObjectInterfaceName());
 217                 Class[] clsSkelParams = { clsInt, int.class, int.class };       // Port number is integer
 218                 Constructor<?> objSkelCons = clsSkel.getDeclaredConstructor(clsSkelParams);
 219                 Object objSkelParams[] = { objMainCls, iRMIStubPort, iRMIRegPort };
 220                 // Create a new thread for each skeleton
 221                 Thread objectThread = new Thread(new Runnable() {
 222                         public void run() {
 223                                 try {
 224                                         Object objSkel = objSkelCons.newInstance(objSkelParams);
 225                                 } catch (InstantiationException |
 226                                                  IllegalAccessException |
 227                                                  InvocationTargetException ex) {
 228                                         ex.printStackTrace();
 229                                 }
 230                         }
 231                 });
 232                 objectThread.start();
 233                 RuntimeOutput.print("IoTSlave: Done generating object!", BOOL_VERBOSE);
 234         }
 235
 236         /**
 237          * A private method to create object
 238          *
 239          * @return  void
 240          */
 241         private void createObject() throws IOException,
 242                 ClassNotFoundException, NoSuchMethodException, InstantiationException,
 243                         RemoteException, AlreadyBoundException, IllegalAccessException,
 244                                 InvocationTargetException {
 245
 246                 // Translating into the actual Message class
 247                 MessageCreateObject sMessage = (MessageCreateObject) sIoTMasterMsg;
 248                 // Instantiate object using reflection
 249                 String strObjClassName = STR_OBJ_CLS_PFX + "." + sMessage.getObjectClass() +
 250                                                                                                                  "." + sMessage.getObjectClass();
 251                 File file = new File(STR_JAR_FILE_PATH + sMessage.getObjectClass() + STR_JAR_FILE_EXT);
 252                 RuntimeOutput.print("IoTSlave: DEBUG print path: " + STR_JAR_FILE_PATH +
 253                                                                                          sMessage.getObjectClass() + STR_JAR_FILE_EXT, BOOL_VERBOSE);
 254                 addURL(file.toURI().toURL());
 255                 clsMain = Class.forName(strObjClassName);
 256                 Class[] clsParams = sMessage.getObjectFldCls();
 257                 Constructor<?> ct = clsMain.getDeclaredConstructor(clsParams);
 258                 Object objParams[] = sMessage.getObjectFields();
 259                 objMainCls = ct.newInstance(objParams);
 260                 RuntimeOutput.print("IoTSlave: Creating RMI skeleton: " +
 261                         sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 262                         " with RMI stub port: " + iRMIStubPort, BOOL_VERBOSE);
 263                 if (CAPAB_BASED_RMI) {
 264                 // Use the new capability-based RMI in Java
 265                         createCapabBasedRMIJava(sMessage);
 266                 } else {
 267                         // Register object to RMI - there are 2 ports: RMI registry port and RMI stub port
 268                         Object objStub = (Object)
 269                                 UnicastRemoteObject.exportObject((Remote) objMainCls, iRMIStubPort);
 270                         Registry registry = LocateRegistry.createRegistry(iRMIRegPort);
 271                         registry.bind(sMessage.getObjectName(), (Remote) objStub);
 272                 }
 273                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 274                 RuntimeOutput.print("IoTSlave: Registering object via RMI!", BOOL_VERBOSE);
 275
 276         }
 277
 278
 279         /**
 280          * A private method to transfer file
 281          *
 282          * @return  void
 283          */
 284         private void transferFile() throws IOException,
 285                 UnknownHostException, FileNotFoundException {
 286
 287                 // Translating into the actual Message class
 288                 MessageSendFile sMessage = (MessageSendFile) sIoTMasterMsg;
 289
 290                 // Send back the received message as acknowledgement
 291                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 292
 293                 // Write file to the current location
 294                 Socket filesocket = new Socket(sIoTMasterHostAdd, iComPort);
 295                 InputStream inFileStream = filesocket.getInputStream();
 296                 OutputStream outFileStream = new FileOutputStream(sMessage.getFileName());
 297                 byte[] bytFile = new byte[Math.toIntExact(sMessage.getFileSize())];
 298
 299                 int iCount = 0;
 300                 while ((iCount = inFileStream.read(bytFile)) > 0) {
 301                         outFileStream.write(bytFile, 0, iCount);
 302                 }
 303                 // Unzip if this is a zipped file
 304                 if (sMessage.getFileName().contains(STR_ZIP_FILE_EXT)) {
 305                         RuntimeOutput.print("IoTSlave: Unzipping file: " + sMessage.getFileName(), BOOL_VERBOSE);
 306                         try {
 307                                 ZipFile zipFile = new ZipFile(sMessage.getFileName());
 308                                 zipFile.extractAll(STR_UNZIP_DIR);
 309                         } catch (ZipException ex) {
 310                                 System.out.println("IoTSlave: Error in unzipping file!");
 311                                 ex.printStackTrace();
 312                         }
 313                 }
 314                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 315                 RuntimeOutput.print("IoTSlave: Receiving file transfer!", BOOL_VERBOSE);
 316         }
 317
 318         /**
 319          * A private method to create a main object
 320          *
 321          * @return  void
 322          */
 323         private void createMainObject() throws IOException,
 324                 ClassNotFoundException, InstantiationException, IllegalAccessException,
 325                         InvocationTargetException {
 326
 327                 // Translating into the actual Message class
 328                 MessageCreateMainObject sMessage = (MessageCreateMainObject) sIoTMasterMsg;
 329
 330                 // Getting controller class
 331                 File file = new File(STR_JAR_FILE_PATH + sMessage.getObjectName() + STR_JAR_FILE_EXT);
 332                 RuntimeOutput.print("IoTSlave: DEBUG print path: " + STR_JAR_FILE_PATH +
 333                                                                                          sMessage.getObjectName() + STR_JAR_FILE_EXT, BOOL_VERBOSE);
 334                 addURL(file.toURI().toURL());
 335                 // We will always have a package name <object name>.<object name>
 336                 // e.g. SmartLightsController.SmartLightsController
 337                 sMainObjectName = sMessage.getObjectName();
 338                 clsMain = Class.forName(sMainObjectName + "." + sMainObjectName);
 339                 objMainCls = clsMain.newInstance();
 340
 341                 // Send back the received message as acknowledgement
 342                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 343                 RuntimeOutput.print("IoTSlave: Instantiating main controller/device class "
 344                                                                                          + sMessage.getObjectName(), BOOL_VERBOSE);
 345
 346         }
 347
 348         /**
 349          * A private method to create a new IoTSet
 350          *
 351          * @return  void
 352          */
 353         private void createNewIoTSet() throws IOException {
 354
 355                 // Translating into the actual Message class
 356                 MessageCreateSetRelation sMessage = (MessageCreateSetRelation) sIoTMasterMsg;
 357
 358                 // Initialize field name
 359                 strFieldName = sMessage.getObjectFieldName();
 360                 RuntimeOutput.print("IoTSlave: Setting up field " + strFieldName, BOOL_VERBOSE);
 361
 362                 // Creating a new IoTSet object
 363                 isetObject = new ISet<Object>();
 364
 365                 // Send back the received message as acknowledgement
 366                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 367                 RuntimeOutput.print("IoTSlave: Creating a new IoTSet object!", BOOL_VERBOSE);
 368
 369         }
 370
 371         /**
 372          * A private method to create a new IoTRelation
 373          *
 374          * @return  void
 375          */
 376         private void createNewIoTRelation() throws IOException {
 377
 378                 // Translating into the actual Message class
 379                 MessageCreateSetRelation sMessage = (MessageCreateSetRelation) sIoTMasterMsg;
 380
 381                 // Initialize field name
 382                 strFieldName = sMessage.getObjectFieldName();
 383                 RuntimeOutput.print("IoTSlave: Setting up field " + strFieldName, BOOL_VERBOSE);
 384
 385                 // Creating a new IoTRelation object
 386                 irelObject = new IRelation<Object,Object>();
 387
 388                 // Send back the received message as acknowledgement
 389                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 390                 RuntimeOutput.print("IoTSlave: Creating a new IoTRelation object!", BOOL_VERBOSE);
 391
 392         }
 393
 394         /**
 395          * A private method to get an object from the registry
 396          *
 397          * @return  Object
 398          */
 399         private Object getObjectFromRegistry() throws RemoteException,
 400                         ClassNotFoundException, NotBoundException {
 401
 402                 // Translating into the actual Message class
 403                 MessageGetObject sMessage = (MessageGetObject) sIoTMasterMsg;
 404
 405                 // Locate RMI registry and add object into IoTSet
 406                 Registry registry =
 407                         LocateRegistry.getRegistry(sMessage.getHostAddress(), sMessage.getRMIRegPort());
 408                 RuntimeOutput.print("IoTSlave: Looking for RMI registry: " +
 409                         sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 410                         " with RMI stub port: " + sMessage.getRMIStubPort(), BOOL_VERBOSE);
 411                 Object stubObj = registry.lookup(sMessage.getObjectName());
 412                 RuntimeOutput.print("IoTSlave: Looking for object name: " + sMessage.getObjectName(), BOOL_VERBOSE);
 413
 414                 // Class conversion to interface class of this class,
 415                 // e.g. ProximitySensorImpl has ProximitySensor interface
 416                 String strObjClassInterfaceName = STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX + "." +
 417                         sMessage.getObjectInterfaceName();
 418                 Class<?> clsInf = Class.forName(strObjClassInterfaceName);
 419                 Object stubObjConv = clsInf.cast(stubObj);
 420
 421                 return stubObjConv;
 422         }
 423
 424         /**
 425          * A private method to get an object and create a stub
 426          * <p>
 427          * This is using the capability-based RMI skeleton and stub scheme
 428          *
 429          * @return  Object
 430          */
 431         private Object getObjectFromStub() throws RemoteException,
 432                         ClassNotFoundException, NoSuchMethodException, InstantiationException,
 433                         IllegalAccessException, NotBoundException, InvocationTargetException, UnknownHostException {
 434
 435                 // Translating into the actual Message class
 436                 MessageGetObject sMessage = (MessageGetObject) sIoTMasterMsg;
 437                 Object stubObjConv = null;
 438                 String strObjectName = sMessage.getObjectName();
 439                 String strObjClassInterfaceName = STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX + "." +
 440                         sMessage.getObjectStubInterfaceName();
 441                 Class<?> clsInf = Class.forName(strObjClassInterfaceName);
 442                 if (mapObjNameStub.containsKey(strObjectName)) {
 443                         RuntimeOutput.print("IoTSlave: Getting back object on slave: " + strObjectName, BOOL_VERBOSE);
 444                         stubObjConv = clsInf.cast(mapObjNameStub.get(strObjectName));
 445                 } else {
 446                         // Instantiate the stub and put in the object
 447                         String strObjStubName = sMainObjectName + "." + sMessage.getObjectStubInterfaceName() + STUB_CLASS_SUFFIX;
 448                         Class<?> clsStub = Class.forName(strObjStubName);       // Port number is integer
 449                         Class[] clsStubParams = { int.class, int.class, int.class, int.class, String.class, int.class };
 450                         Constructor<?> objStubCons = clsStub.getDeclaredConstructor(clsStubParams);
 451
 452                         int rev = 0;
 453                         Object objStubParams[] = { 0, 0, sMessage.getRMIStubPort(), sMessage.getRMIRegPort(), sMessage.getHostAddress(), rev };
 454                         RuntimeOutput.print("IoTSlave: Creating RMI stub: " +
 455                                 sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 456                                 " and RMI stub port: " + sMessage.getRMIStubPort(), BOOL_VERBOSE);
 457                         Object stubObj = objStubCons.newInstance(objStubParams);
 458                         // Class conversion to interface class of this class,
 459                         // e.g. ProximitySensorImpl has ProximitySensor interface
 460                         RuntimeOutput.print("IoTSlave: Registering new stub object: " + strObjectName, BOOL_VERBOSE);
 461                         mapObjNameStub.put(strObjectName, stubObj);
 462                         stubObjConv = clsInf.cast(stubObj);
 463                 }
 464
 465                 return stubObjConv;
 466         }
 467
 468         /**
 469          * A private method to get an IoTSet object
 470          *
 471          * @return  void
 472          */
 473         private void getIoTSetObject() throws IOException,
 474                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 475                 InstantiationException, IllegalAccessException, InvocationTargetException {
 476                 Object objRegistry = null;
 477                 if (CAPAB_BASED_RMI)
 478                         objRegistry = getObjectFromStub();
 479                 else
 480                         objRegistry = getObjectFromRegistry();
 481                 isetObject.add(objRegistry);
 482                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 483
 484                 // Send back the received message as acknowledgement
 485                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 486                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 487         }
 488
 489         /**
 490          * A private method to get an IoTRelation first object
 491          *
 492          * @return  void
 493          */
 494         private void getIoTRelationFirstObject() throws IOException,
 495                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 496                 InstantiationException, IllegalAccessException, InvocationTargetException {
 497                 Object objRegistry = null;
 498                 if (CAPAB_BASED_RMI)
 499                         objRegistry = getObjectFromStub();
 500                 else
 501                         objRegistry = getObjectFromRegistry();
 502                 iRelFirstObject = objRegistry;
 503
 504                 // Send back the received message as acknowledgement
 505                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 506                 RuntimeOutput.print("IoTSlave: Getting a first object for IoTRelation!", BOOL_VERBOSE);
 507
 508         }
 509
 510         /**
 511          * A private method to get an IoTRelation second object
 512          *
 513          * @return  void
 514          */
 515         private void getIoTRelationSecondObject() throws IOException,
 516                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 517                 InstantiationException, IllegalAccessException, InvocationTargetException {
 518                 Object objRegistry = null;
 519                 if (CAPAB_BASED_RMI)
 520                         objRegistry = getObjectFromStub();
 521                 else
 522                         objRegistry = getObjectFromRegistry();
 523                 iRelSecondObject = objRegistry;
 524
 525                 // Now add the first and the second object into IoTRelation
 526                 irelObject.put(iRelFirstObject, iRelSecondObject);
 527                 RuntimeOutput.print("IoTSlave: This IoTRelation now has: " + irelObject.size() + " entry(s)", BOOL_VERBOSE);
 528
 529                 // Send back the received message as acknowledgement
 530                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 531                 RuntimeOutput.print("IoTSlave: Getting a second object for IoTRelation!", BOOL_VERBOSE);
 532
 533         }
 534
 535         /**
 536          * A private method to reinitialize IoTSet field
 537          *
 538          * @return  void
 539          */
 540         private void reinitializeIoTSetField() throws IOException,
 541                 IllegalAccessException, NoSuchFieldException {
 542
 543                 // Reinitialize IoTSet field after getting all the objects
 544                 iotsetObject = new IoTSet<Object>(isetObject.values());
 545                 // Private fields need getDeclaredField(), while public fields use getField()
 546                 Field fld = clsMain.getDeclaredField(strFieldName);
 547                 boolean bAccess = fld.isAccessible();
 548                 fld.setAccessible(true);
 549                 fld.set(objMainCls, iotsetObject);
 550                 fld.setAccessible(bAccess);
 551                 RuntimeOutput.print("IoTSlave: Reinitializing field " + strFieldName, BOOL_VERBOSE);
 552
 553                 // Send back the received message as acknowledgement
 554                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 555                 RuntimeOutput.print("IoTSlave: Reinitializing IoTSet field!", BOOL_VERBOSE);
 556
 557         }
 558
 559         /**
 560          * A private method to reinitialize IoTRelation field
 561          *
 562          * @return  void
 563          */
 564         private void reinitializeIoTRelationField() throws IOException,
 565                 IllegalAccessException, NoSuchFieldException {
 566
 567                 // Reinitialize IoTSet field after getting all the objects
 568                 iotrelObject = new IoTRelation<Object,Object>(irelObject.relationMap(), irelObject.size());
 569                 // Private fields need getDeclaredField(), while public fields use getField()
 570                 Field fld = clsMain.getDeclaredField(strFieldName);
 571                 boolean bAccess = fld.isAccessible();
 572                 fld.setAccessible(true);
 573                 fld.set(objMainCls, iotrelObject);
 574                 fld.setAccessible(bAccess);
 575                 RuntimeOutput.print("IoTSlave: Reinitializing field " + strFieldName, BOOL_VERBOSE);
 576
 577                 // Send back the received message as acknowledgement
 578                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 579                 RuntimeOutput.print("IoTSlave: Reinitializing IoTRelation field!", BOOL_VERBOSE);
 580
 581         }
 582
 583         /**
 584          * A private method to get the device driver object's IoTSet
 585          * <p>
 586          * This is to handle device driver's IoTSet that contains IP addresses
 587          *
 588          * @return  void
 589          */
 590         private void getDeviceIoTSetObject() throws IOException {
 591
 592                 // Translating into the actual Message class
 593                 MessageGetDeviceObject sMessage = (MessageGetDeviceObject) sIoTMasterMsg;
 594                 // Get IoTSet objects for IP address set on device driver/controller
 595                 IoTDeviceAddress objDeviceAddress = new IoTDeviceAddress(sMessage.getHostAddress(),
 596                         sMessage.getSourceDeviceDriverPort(),
 597                         sMessage.getDestinationDeviceDriverPort(),
 598                         sMessage.isSourcePortWildCard(),
 599                         sMessage.isDestinationPortWildCard());
 600                 RuntimeOutput.print("IoTSlave: Device address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 601                 isetObject.add(objDeviceAddress);
 602                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 603
 604                 // Send back the received message as acknowledgement
 605                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 606                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 607
 608         }
 609
 610         /**
 611          * A private method to get the device driver object's IoTSet for IoTZigbeeAddress
 612          * <p>
 613          * This is to handle device driver's IoTSet that contains Zigbee addresses
 614          *
 615          * @return  void
 616          */
 617         private void getZBDevIoTSetObject() throws IOException {
 618
 619                 // Translating into the actual Message class
 620                 MessageGetSimpleDeviceObject sMessage = (MessageGetSimpleDeviceObject) sIoTMasterMsg;
 621                 // Get IoTSet objects for IP address set on device driver/controller
 622                 IoTZigbeeAddress objZBDevAddress = new IoTZigbeeAddress(sMessage.getHostAddress());
 623                 RuntimeOutput.print("IoTSlave: Device address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 624                 isetObject.add(objZBDevAddress);
 625                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 626
 627                 // Send back the received message as acknowledgement
 628                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 629                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 630
 631         }
 632
 633
 634         /**
 635          * A private method to get IoTAddress objects for IoTSet
 636          *
 637          * @return  void
 638          */
 639         private void getAddIoTSetObject() throws IOException {
 640
 641                 // Translating into the actual Message class
 642                 MessageGetSimpleDeviceObject sMessage = (MessageGetSimpleDeviceObject) sIoTMasterMsg;
 643                 // Get IoTSet objects for IP address set on device driver/controller
 644                 IoTAddress objAddress = new IoTAddress(sMessage.getHostAddress());
 645                 RuntimeOutput.print("IoTSlave: Address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 646                 isetObject.add(objAddress);
 647                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 648                 // Send back the received message as acknowledgement
 649                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 650                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 651
 652         }
 653
 654         /**
 655          * A private method to invoke init() method in the controller object
 656          *
 657          * @return  void
 658          */
 659         private void invokeInitMethod() throws IOException {
 660
 661                 new Thread() {
 662                         public void run() {
 663                                 try {
 664                                         Class<?> noparams[] = {};
 665                                         Method method = clsMain.getDeclaredMethod("init", noparams);
 666                                         method.invoke(objMainCls);
 667                                 } catch (NoSuchMethodException  |
 668                                                  IllegalAccessException |
 669                                                  InvocationTargetException ex) {
 670                                         System.out.println("IoTSlave: Exception: "
 671                                                  + ex.getMessage());
 672                                         ex.printStackTrace();
 673                                 }
 674                         }
 675                 }.start();
 676
 677                 // Start a new thread to invoke the init function
 678                 RuntimeOutput.print("IoTSlave: Invoke init method! Job done!", BOOL_VERBOSE);
 679
 680                 // Send back the received message as acknowledgement
 681                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 682
 683         }
 684
 685         /**
 686          * A public method to do communication with IoTMaster
 687          *
 688          * @params  iIndex  Integer index
 689          * @return  void
 690          */
 691         public void commIoTMaster() {
 692
 693                 try {
 694
 695                         // Loop, receive and process commands from IoTMaster
 696                         socket = new Socket(sIoTMasterHostAdd, iComPort);
 697                         outStream = new ObjectOutputStream(socket.getOutputStream());
 698                         inStream = new ObjectInputStream(socket.getInputStream());
 699
 700                         LOOP:
 701                         while(true) {
 702                                 // Get the first payload
 703                                 RuntimeOutput.print("IoTSlave: Slave waiting...", BOOL_VERBOSE);
 704                                 sIoTMasterMsg = (Message) inStream.readObject();
 705
 706                                 // Check payload message from IoTMaster and make a decision
 707                                 switch (sIoTMasterMsg.getMessage()) {
 708
 709                                 case CREATE_OBJECT:
 710                                         createObject();
 711                                         break;
 712
 713                                 case TRANSFER_FILE:
 714                                         transferFile();
 715                                         break;
 716
 717                                 case CREATE_MAIN_OBJECT:
 718                                         createMainObject();
 719                                         break;
 720
 721                                 case CREATE_NEW_IOTSET:
 722                                         createNewIoTSet();
 723                                         break;
 724
 725                                 case CREATE_NEW_IOTRELATION:
 726                                         createNewIoTRelation();
 727                                         break;
 728
 729                                 case GET_IOTSET_OBJECT:
 730                                         getIoTSetObject();
 731                                         break;
 732
 733                                 case GET_IOTRELATION_FIRST_OBJECT:
 734                                         getIoTRelationFirstObject();
 735                                         break;
 736
 737                                 case GET_IOTRELATION_SECOND_OBJECT:
 738                                         getIoTRelationSecondObject();
 739                                         break;
 740
 741                                 case REINITIALIZE_IOTSET_FIELD:
 742                                         reinitializeIoTSetField();
 743                                         break;
 744
 745                                 case REINITIALIZE_IOTRELATION_FIELD:
 746                                         reinitializeIoTRelationField();
 747                                         break;
 748
 749                                 case GET_DEVICE_IOTSET_OBJECT:
 750                                         getDeviceIoTSetObject();
 751                                         break;
 752
 753                                 case GET_ZB_DEV_IOTSET_OBJECT:
 754                                         getZBDevIoTSetObject();
 755                                         break;
 756
 757                                 case GET_ADD_IOTSET_OBJECT:
 758                                         getAddIoTSetObject();
 759                                         break;
 760
 761                                 case INVOKE_INIT_METHOD:
 762                                         invokeInitMethod();
 763                                         break;
 764
 765                                 case END_SESSION:
 766                                         // END of session
 767                                         break LOOP;
 768
 769                                 default:
 770                                         break;
 771                                 }
 772                         }
 773                         RuntimeOutput.print("IoTSlave: Session ends!", BOOL_VERBOSE);
 774
 775                         // Closing streams and end session
 776                         outStream.close();
 777                         inStream.close();
 778                         socket.close();
 779                         RuntimeOutput.print("IoTSlave: Closing!", BOOL_VERBOSE);
 780                         // We have to continuously loop because we are preserving our stubs and skeletons
 781                         //while(true) { }
 782
 783                 } catch (IOException               |
 784                                  ClassNotFoundException    |
 785                                  NoSuchMethodException     |
 786                                  InstantiationException    |
 787                                  AlreadyBoundException     |
 788                                  IllegalAccessException    |
 789                                  InvocationTargetException |
 790                                  NotBoundException         |
 791                                  NoSuchFieldException ex) {
 792                         System.out.println("IoTSlave: Exception: "
 793                                  + ex.getMessage());
 794                         ex.printStackTrace();
 795                 }
 796         }
 797
 798         public static void main(String args[]) {
 799                 IoTSlave iotSlave = new IoTSlave(args);
 800                 iotSlave.parseIoTSlaveConfigFile();
 801                 iotSlave.commIoTMaster();
 802         }
 803 }