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                 // 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, String.class, int.class };    // Port number is integer
 218                 Constructor<?> objSkelCons = clsSkel.getDeclaredConstructor(clsSkelParams);
 219                 String callbackAddress = InetAddress.getLocalHost().getHostAddress();   // Callback address is this machine's address
 220                 Object objSkelParams[] = { objMainCls, callbackAddress, iRMIStubPort };
 221                 // Create a new thread for each skeleton
 222                 Thread objectThread = new Thread(new Runnable() {
 223                         public void run() {
 224                                 try {
 225                                         Object objSkel = objSkelCons.newInstance(objSkelParams);
 226                                 } catch (InstantiationException |
 227                                                  IllegalAccessException |
 228                                                  InvocationTargetException ex) {
 229                                         ex.printStackTrace();
 230                                 }
 231                         }
 232                 });
 233                 objectThread.start();
 234                 RuntimeOutput.print("IoTSlave: Done generating object!", BOOL_VERBOSE);
 235         }
 236
 237         /**
 238          * A private method to create object
 239          *
 240          * @return  void
 241          */
 242         private void createObject() throws IOException,
 243                 ClassNotFoundException, NoSuchMethodException, InstantiationException,
 244                         RemoteException, AlreadyBoundException, IllegalAccessException,
 245                                 InvocationTargetException {
 246
 247                 // Translating into the actual Message class
 248                 MessageCreateObject sMessage = (MessageCreateObject) sIoTMasterMsg;
 249                 // Instantiate object using reflection
 250                 String strObjClassName = STR_OBJ_CLS_PFX + "." + sMessage.getObjectClass() +
 251                                                                                                                  "." + sMessage.getObjectClass();
 252                 File file = new File(STR_JAR_FILE_PATH + sMessage.getObjectClass() + STR_JAR_FILE_EXT);
 253                 RuntimeOutput.print("IoTSlave: DEBUG print path: " + STR_JAR_FILE_PATH +
 254                                                                                          sMessage.getObjectClass() + STR_JAR_FILE_EXT, BOOL_VERBOSE);
 255                 addURL(file.toURI().toURL());
 256                 clsMain = Class.forName(strObjClassName);
 257                 Class[] clsParams = sMessage.getObjectFldCls();
 258                 Constructor<?> ct = clsMain.getDeclaredConstructor(clsParams);
 259                 Object objParams[] = sMessage.getObjectFields();
 260                 objMainCls = ct.newInstance(objParams);
 261                 RuntimeOutput.print("IoTSlave: Creating RMI skeleton: " +
 262                         sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 263                         " with RMI stub port: " + iRMIStubPort, BOOL_VERBOSE);
 264                 if (CAPAB_BASED_RMI) {
 265                 // Use the new capability-based RMI in Java
 266                         createCapabBasedRMIJava(sMessage);
 267                 } else {
 268                         // Register object to RMI - there are 2 ports: RMI registry port and RMI stub port
 269                         Object objStub = (Object)
 270                                 UnicastRemoteObject.exportObject((Remote) objMainCls, iRMIStubPort);
 271                         Registry registry = LocateRegistry.createRegistry(iRMIRegPort);
 272                         registry.bind(sMessage.getObjectName(), (Remote) objStub);
 273                 }
 274                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 275                 RuntimeOutput.print("IoTSlave: Registering object via RMI!", BOOL_VERBOSE);
 276
 277         }
 278
 279
 280         /**
 281          * A private method to transfer file
 282          *
 283          * @return  void
 284          */
 285         private void transferFile() throws IOException,
 286                 UnknownHostException, FileNotFoundException {
 287
 288                 // Translating into the actual Message class
 289                 MessageSendFile sMessage = (MessageSendFile) sIoTMasterMsg;
 290
 291                 // Send back the received message as acknowledgement
 292                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 293
 294                 // Write file to the current location
 295                 Socket filesocket = new Socket(sIoTMasterHostAdd, iComPort);
 296                 InputStream inFileStream = filesocket.getInputStream();
 297                 OutputStream outFileStream = new FileOutputStream(sMessage.getFileName());
 298                 byte[] bytFile = new byte[Math.toIntExact(sMessage.getFileSize())];
 299
 300                 int iCount = 0;
 301                 while ((iCount = inFileStream.read(bytFile)) > 0) {
 302                         outFileStream.write(bytFile, 0, iCount);
 303                 }
 304                 // Unzip if this is a zipped file
 305                 if (sMessage.getFileName().contains(STR_ZIP_FILE_EXT)) {
 306                         RuntimeOutput.print("IoTSlave: Unzipping file: " + sMessage.getFileName(), BOOL_VERBOSE);
 307                         try {
 308                                 ZipFile zipFile = new ZipFile(sMessage.getFileName());
 309                                 zipFile.extractAll(STR_UNZIP_DIR);
 310                         } catch (ZipException ex) {
 311                                 System.out.println("IoTSlave: Error in unzipping file!");
 312                                 ex.printStackTrace();
 313                         }
 314                 }
 315                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 316                 RuntimeOutput.print("IoTSlave: Receiving file transfer!", BOOL_VERBOSE);
 317         }
 318
 319         /**
 320          * A private method to create a main object
 321          *
 322          * @return  void
 323          */
 324         private void createMainObject() throws IOException,
 325                 ClassNotFoundException, InstantiationException, IllegalAccessException,
 326                         InvocationTargetException {
 327
 328                 // Translating into the actual Message class
 329                 MessageCreateMainObject sMessage = (MessageCreateMainObject) sIoTMasterMsg;
 330
 331                 // Getting controller class
 332                 File file = new File(STR_JAR_FILE_PATH + sMessage.getObjectName() + STR_JAR_FILE_EXT);
 333                 RuntimeOutput.print("IoTSlave: DEBUG print path: " + STR_JAR_FILE_PATH +
 334                                                                                          sMessage.getObjectName() + STR_JAR_FILE_EXT, BOOL_VERBOSE);
 335                 addURL(file.toURI().toURL());
 336                 // We will always have a package name <object name>.<object name>
 337                 // e.g. SmartLightsController.SmartLightsController
 338                 sMainObjectName = sMessage.getObjectName();
 339                 clsMain = Class.forName(sMainObjectName + "." + sMainObjectName);
 340                 objMainCls = clsMain.newInstance();
 341
 342                 // Send back the received message as acknowledgement
 343                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 344                 RuntimeOutput.print("IoTSlave: Instantiating main controller/device class "
 345                                                                                          + sMessage.getObjectName(), BOOL_VERBOSE);
 346
 347         }
 348
 349         /**
 350          * A private method to create a new IoTSet
 351          *
 352          * @return  void
 353          */
 354         private void createNewIoTSet() throws IOException {
 355
 356                 // Translating into the actual Message class
 357                 MessageCreateSetRelation sMessage = (MessageCreateSetRelation) sIoTMasterMsg;
 358
 359                 // Initialize field name
 360                 strFieldName = sMessage.getObjectFieldName();
 361                 RuntimeOutput.print("IoTSlave: Setting up field " + strFieldName, BOOL_VERBOSE);
 362
 363                 // Creating a new IoTSet object
 364                 isetObject = new ISet<Object>();
 365
 366                 // Send back the received message as acknowledgement
 367                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 368                 RuntimeOutput.print("IoTSlave: Creating a new IoTSet object!", BOOL_VERBOSE);
 369
 370         }
 371
 372         /**
 373          * A private method to create a new IoTRelation
 374          *
 375          * @return  void
 376          */
 377         private void createNewIoTRelation() throws IOException {
 378
 379                 // Translating into the actual Message class
 380                 MessageCreateSetRelation sMessage = (MessageCreateSetRelation) sIoTMasterMsg;
 381
 382                 // Initialize field name
 383                 strFieldName = sMessage.getObjectFieldName();
 384                 RuntimeOutput.print("IoTSlave: Setting up field " + strFieldName, BOOL_VERBOSE);
 385
 386                 // Creating a new IoTRelation object
 387                 irelObject = new IRelation<Object,Object>();
 388
 389                 // Send back the received message as acknowledgement
 390                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 391                 RuntimeOutput.print("IoTSlave: Creating a new IoTRelation object!", BOOL_VERBOSE);
 392
 393         }
 394
 395         /**
 396          * A private method to get an object from the registry
 397          *
 398          * @return  Object
 399          */
 400         private Object getObjectFromRegistry() throws RemoteException,
 401                         ClassNotFoundException, NotBoundException {
 402
 403                 // Translating into the actual Message class
 404                 MessageGetObject sMessage = (MessageGetObject) sIoTMasterMsg;
 405
 406                 // Locate RMI registry and add object into IoTSet
 407                 Registry registry =
 408                         LocateRegistry.getRegistry(sMessage.getHostAddress(), sMessage.getRMIRegPort());
 409                 RuntimeOutput.print("IoTSlave: Looking for RMI registry: " +
 410                         sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 411                         " with RMI stub port: " + sMessage.getRMIStubPort(), BOOL_VERBOSE);
 412                 Object stubObj = registry.lookup(sMessage.getObjectName());
 413                 RuntimeOutput.print("IoTSlave: Looking for object name: " + sMessage.getObjectName(), BOOL_VERBOSE);
 414
 415                 // Class conversion to interface class of this class,
 416                 // e.g. ProximitySensorImpl has ProximitySensor interface
 417                 String strObjClassInterfaceName = STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX + "." +
 418                         sMessage.getObjectInterfaceName();
 419                 Class<?> clsInf = Class.forName(strObjClassInterfaceName);
 420                 Object stubObjConv = clsInf.cast(stubObj);
 421
 422                 return stubObjConv;
 423         }
 424
 425         /**
 426          * A private method to get an object and create a stub
 427          * <p>
 428          * This is using the capability-based RMI skeleton and stub scheme
 429          *
 430          * @return  Object
 431          */
 432         private Object getObjectFromStub() throws RemoteException,
 433                         ClassNotFoundException, NoSuchMethodException, InstantiationException,
 434                         IllegalAccessException, NotBoundException, InvocationTargetException, UnknownHostException {
 435
 436                 // Translating into the actual Message class
 437                 MessageGetObject sMessage = (MessageGetObject) sIoTMasterMsg;
 438                 Object stubObjConv = null;
 439                 String strObjectName = sMessage.getObjectName();
 440                 String strObjClassInterfaceName = STR_OBJ_CLS_PFX + "." + STR_INTERFACE_PFX + "." +
 441                         sMessage.getObjectStubInterfaceName();
 442                 Class<?> clsInf = Class.forName(strObjClassInterfaceName);
 443                 if (mapObjNameStub.containsKey(strObjectName)) {
 444                         RuntimeOutput.print("IoTSlave: Getting back object on slave: " + strObjectName, BOOL_VERBOSE);
 445                         stubObjConv = clsInf.cast(mapObjNameStub.get(strObjectName));
 446                 } else {
 447                         // Instantiate the stub and put in the object
 448                         String strObjStubName = sMainObjectName + "." + sMessage.getObjectStubInterfaceName() + STUB_CLASS_SUFFIX;
 449                         Class<?> clsStub = Class.forName(strObjStubName);       // Port number is integer
 450                         Class[] clsStubParams = { int.class, String.class, String.class, int.class, int[].class };
 451                         Constructor<?> objStubCons = clsStub.getDeclaredConstructor(clsStubParams);
 452                         Integer[] portsInteger = sMessage.getRMICallbackPorts();
 453                         int[] ports = Arrays.stream(portsInteger).mapToInt(Integer::intValue).toArray();
 454
 455                         int rev = 0;
 456                         String callbackAddress = InetAddress.getLocalHost().getHostAddress();   // Callback address is this machine's address
 457                         Object objStubParams[] = { sMessage.getRMIStubPort(), sMessage.getHostAddress(), callbackAddress,
 458                                                                                 rev, ports };
 459                         RuntimeOutput.print("IoTSlave: Creating RMI stub: " +
 460                                 sMessage.getHostAddress() + ":" + sMessage.getRMIRegPort() +
 461                                 " with callback address: " + callbackAddress + " and RMI stub port: " + sMessage.getRMIStubPort(), BOOL_VERBOSE);
 462                         Object stubObj = objStubCons.newInstance(objStubParams);
 463                         // Class conversion to interface class of this class,
 464                         // e.g. ProximitySensorImpl has ProximitySensor interface
 465                         RuntimeOutput.print("IoTSlave: Registering new stub object: " + strObjectName, BOOL_VERBOSE);
 466                         mapObjNameStub.put(strObjectName, stubObj);
 467                         stubObjConv = clsInf.cast(stubObj);
 468                 }
 469
 470                 return stubObjConv;
 471         }
 472
 473         /**
 474          * A private method to get an IoTSet object
 475          *
 476          * @return  void
 477          */
 478         private void getIoTSetObject() throws IOException,
 479                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 480                 InstantiationException, IllegalAccessException, InvocationTargetException {
 481
 482                 Object objRegistry = null;
 483                 if (CAPAB_BASED_RMI)
 484                         objRegistry = getObjectFromStub();
 485                 else
 486                         objRegistry = getObjectFromRegistry();
 487                 isetObject.add(objRegistry);
 488                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 489
 490                 // Send back the received message as acknowledgement
 491                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 492                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 493         }
 494
 495         /**
 496          * A private method to get an IoTRelation first object
 497          *
 498          * @return  void
 499          */
 500         private void getIoTRelationFirstObject() throws IOException,
 501                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 502                 InstantiationException, IllegalAccessException, InvocationTargetException {
 503
 504                 Object objRegistry = null;
 505                 if (CAPAB_BASED_RMI)
 506                         objRegistry = getObjectFromStub();
 507                 else
 508                         objRegistry = getObjectFromRegistry();
 509                 iRelFirstObject = objRegistry;
 510
 511                 // Send back the received message as acknowledgement
 512                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 513                 RuntimeOutput.print("IoTSlave: Getting a first object for IoTRelation!", BOOL_VERBOSE);
 514
 515         }
 516
 517         /**
 518          * A private method to get an IoTRelation second object
 519          *
 520          * @return  void
 521          */
 522         private void getIoTRelationSecondObject() throws IOException,
 523                 ClassNotFoundException, RemoteException, NotBoundException, NoSuchMethodException,
 524                 InstantiationException, IllegalAccessException, InvocationTargetException {
 525
 526                 Object objRegistry = null;
 527                 if (CAPAB_BASED_RMI)
 528                         objRegistry = getObjectFromStub();
 529                 else
 530                         objRegistry = getObjectFromRegistry();
 531                 iRelSecondObject = objRegistry;
 532
 533                 // Now add the first and the second object into IoTRelation
 534                 irelObject.put(iRelFirstObject, iRelSecondObject);
 535                 RuntimeOutput.print("IoTSlave: This IoTRelation now has: " + irelObject.size() + " entry(s)", BOOL_VERBOSE);
 536
 537                 // Send back the received message as acknowledgement
 538                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 539                 RuntimeOutput.print("IoTSlave: Getting a second object for IoTRelation!", BOOL_VERBOSE);
 540
 541         }
 542
 543         /**
 544          * A private method to reinitialize IoTSet field
 545          *
 546          * @return  void
 547          */
 548         private void reinitializeIoTSetField() throws IOException,
 549                 IllegalAccessException, NoSuchFieldException {
 550
 551                 // Reinitialize IoTSet field after getting all the objects
 552                 iotsetObject = new IoTSet<Object>(isetObject.values());
 553
 554                 // Private fields need getDeclaredField(), while public fields use getField()
 555                 Field fld = clsMain.getDeclaredField(strFieldName);
 556                 boolean bAccess = fld.isAccessible();
 557                 fld.setAccessible(true);
 558                 fld.set(objMainCls, iotsetObject);
 559                 fld.setAccessible(bAccess);
 560                 RuntimeOutput.print("IoTSlave: Reinitializing field " + strFieldName, BOOL_VERBOSE);
 561
 562                 // Send back the received message as acknowledgement
 563                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 564                 RuntimeOutput.print("IoTSlave: Reinitializing IoTSet field!", BOOL_VERBOSE);
 565
 566         }
 567
 568         /**
 569          * A private method to reinitialize IoTRelation field
 570          *
 571          * @return  void
 572          */
 573         private void reinitializeIoTRelationField() throws IOException,
 574                 IllegalAccessException, NoSuchFieldException {
 575
 576                 // Reinitialize IoTSet field after getting all the objects
 577                 iotrelObject = new IoTRelation<Object,Object>(irelObject.relationMap(), irelObject.size());
 578
 579                 // Private fields need getDeclaredField(), while public fields use getField()
 580                 Field fld = clsMain.getDeclaredField(strFieldName);
 581                 boolean bAccess = fld.isAccessible();
 582                 fld.setAccessible(true);
 583                 fld.set(objMainCls, iotrelObject);
 584                 fld.setAccessible(bAccess);
 585                 RuntimeOutput.print("IoTSlave: Reinitializing field " + strFieldName, BOOL_VERBOSE);
 586
 587                 // Send back the received message as acknowledgement
 588                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 589                 RuntimeOutput.print("IoTSlave: Reinitializing IoTRelation field!", BOOL_VERBOSE);
 590
 591         }
 592
 593         /**
 594          * A private method to get the device driver object's IoTSet
 595          * <p>
 596          * This is to handle device driver's IoTSet that contains IP addresses
 597          *
 598          * @return  void
 599          */
 600         private void getDeviceIoTSetObject() throws IOException {
 601
 602                 // Translating into the actual Message class
 603                 MessageGetDeviceObject sMessage = (MessageGetDeviceObject) sIoTMasterMsg;
 604
 605                 // Get IoTSet objects for IP address set on device driver/controller
 606                 IoTDeviceAddress objDeviceAddress = new IoTDeviceAddress(sMessage.getHostAddress(),
 607                         sMessage.getSourceDeviceDriverPort(),
 608                         sMessage.getDestinationDeviceDriverPort(),
 609                         sMessage.isSourcePortWildCard(),
 610                         sMessage.isDestinationPortWildCard());
 611                 RuntimeOutput.print("IoTSlave: Device address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 612                 isetObject.add(objDeviceAddress);
 613                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 614
 615                 // Send back the received message as acknowledgement
 616                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 617                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 618
 619         }
 620
 621         /**
 622          * A private method to get the device driver object's IoTSet for IoTZigbeeAddress
 623          * <p>
 624          * This is to handle device driver's IoTSet that contains Zigbee addresses
 625          *
 626          * @return  void
 627          */
 628         private void getZBDevIoTSetObject() throws IOException {
 629
 630                 // Translating into the actual Message class
 631                 MessageGetSimpleDeviceObject sMessage = (MessageGetSimpleDeviceObject) sIoTMasterMsg;
 632
 633                 // Get IoTSet objects for IP address set on device driver/controller
 634                 IoTZigbeeAddress objZBDevAddress = new IoTZigbeeAddress(sMessage.getHostAddress());
 635                 RuntimeOutput.print("IoTSlave: Device address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 636                 isetObject.add(objZBDevAddress);
 637                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 638
 639                 // Send back the received message as acknowledgement
 640                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 641                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 642
 643         }
 644
 645
 646         /**
 647          * A private method to get IoTAddress objects for IoTSet
 648          *
 649          * @return  void
 650          */
 651         private void getAddIoTSetObject() throws IOException {
 652
 653                 // Translating into the actual Message class
 654                 MessageGetSimpleDeviceObject sMessage = (MessageGetSimpleDeviceObject) sIoTMasterMsg;
 655
 656                 // Get IoTSet objects for IP address set on device driver/controller
 657                 IoTAddress objAddress = new IoTAddress(sMessage.getHostAddress());
 658                 RuntimeOutput.print("IoTSlave: Address transferred: " + sMessage.getHostAddress(), BOOL_VERBOSE);
 659                 isetObject.add(objAddress);
 660                 RuntimeOutput.print("IoTSlave: This IoTSet now has: " + isetObject.size() + " entry(s)", BOOL_VERBOSE);
 661                 // Send back the received message as acknowledgement
 662                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 663                 RuntimeOutput.print("IoTSlave: Getting an object for IoTSet!", BOOL_VERBOSE);
 664
 665         }
 666
 667         /**
 668          * A private method to invoke init() method in the controller object
 669          *
 670          * @return  void
 671          */
 672         private void invokeInitMethod() throws IOException {
 673
 674                 new Thread() {
 675                         public void run() {
 676                                 try {
 677                                         Class<?> noparams[] = {};
 678                                         Method method = clsMain.getDeclaredMethod("init", noparams);
 679                                         method.invoke(objMainCls);
 680                                 } catch (NoSuchMethodException  |
 681                                                  IllegalAccessException |
 682                                                  InvocationTargetException ex) {
 683                                         System.out.println("IoTSlave: Exception: "
 684                                                  + ex.getMessage());
 685                                         ex.printStackTrace();
 686                                 }
 687                         }
 688                 }.start();
 689
 690                 // Start a new thread to invoke the init function
 691                 RuntimeOutput.print("IoTSlave: Invoke init method! Job done!", BOOL_VERBOSE);
 692
 693                 // Send back the received message as acknowledgement
 694                 outStream.writeObject(new MessageSimple(IoTCommCode.ACKNOWLEDGED));
 695
 696         }
 697
 698         /**
 699          * A public method to do communication with IoTMaster
 700          *
 701          * @params  iIndex  Integer index
 702          * @return  void
 703          */
 704         public void commIoTMaster() {
 705
 706                 try {
 707
 708                         // Loop, receive and process commands from IoTMaster
 709                         socket = new Socket(sIoTMasterHostAdd, iComPort);
 710                         outStream = new ObjectOutputStream(socket.getOutputStream());
 711                         inStream = new ObjectInputStream(socket.getInputStream());
 712
 713                         LOOP:
 714                         while(true) {
 715                                 // Get the first payload
 716                                 RuntimeOutput.print("IoTSlave: Slave waiting...", BOOL_VERBOSE);
 717                                 sIoTMasterMsg = (Message) inStream.readObject();
 718
 719                                 // Check payload message from IoTMaster and make a decision
 720                                 switch (sIoTMasterMsg.getMessage()) {
 721
 722                                 case CREATE_OBJECT:
 723                                         createObject();
 724                                         break;
 725
 726                                 case TRANSFER_FILE:
 727                                         transferFile();
 728                                         break;
 729
 730                                 case CREATE_MAIN_OBJECT:
 731                                         createMainObject();
 732                                         break;
 733
 734                                 case CREATE_NEW_IOTSET:
 735                                         createNewIoTSet();
 736                                         break;
 737
 738                                 case CREATE_NEW_IOTRELATION:
 739                                         createNewIoTRelation();
 740                                         break;
 741
 742                                 case GET_IOTSET_OBJECT:
 743                                         getIoTSetObject();
 744                                         break;
 745
 746                                 case GET_IOTRELATION_FIRST_OBJECT:
 747                                         getIoTRelationFirstObject();
 748                                         break;
 749
 750                                 case GET_IOTRELATION_SECOND_OBJECT:
 751                                         getIoTRelationSecondObject();
 752                                         break;
 753
 754                                 case REINITIALIZE_IOTSET_FIELD:
 755                                         reinitializeIoTSetField();
 756                                         break;
 757
 758                                 case REINITIALIZE_IOTRELATION_FIELD:
 759                                         reinitializeIoTRelationField();
 760                                         break;
 761
 762                                 case GET_DEVICE_IOTSET_OBJECT:
 763                                         getDeviceIoTSetObject();
 764                                         break;
 765
 766                                 case GET_ZB_DEV_IOTSET_OBJECT:
 767                                         getZBDevIoTSetObject();
 768                                         break;
 769
 770                                 case GET_ADD_IOTSET_OBJECT:
 771                                         getAddIoTSetObject();
 772                                         break;
 773
 774                                 case INVOKE_INIT_METHOD:
 775                                         invokeInitMethod();
 776                                         break;
 777
 778                                 case END_SESSION:
 779                                         // END of session
 780                                         break LOOP;
 781
 782                                 default:
 783                                         break;
 784                                 }
 785                         }
 786                         RuntimeOutput.print("IoTSlave: Session ends!", BOOL_VERBOSE);
 787
 788                         // Closing streams and end session
 789                         outStream.close();
 790                         inStream.close();
 791                         socket.close();
 792                         RuntimeOutput.print("IoTSlave: Closing!", BOOL_VERBOSE);
 793                         // We have to continuously loop because we are preserving our stubs and skeletons
 794                         //while(true) { }
 795
 796                 } catch (IOException               |
 797                                  ClassNotFoundException    |
 798                                  NoSuchMethodException     |
 799                                  InstantiationException    |
 800                                  AlreadyBoundException     |
 801                                  IllegalAccessException    |
 802                                  InvocationTargetException |
 803                                  NotBoundException         |
 804                                  NoSuchFieldException ex) {
 805                         System.out.println("IoTSlave: Exception: "
 806                                  + ex.getMessage());
 807                         ex.printStackTrace();
 808                 }
 809         }
 810
 811         public static void main(String args[]) {
 812                 IoTSlave iotSlave = new IoTSlave(args);
 813                 iotSlave.parseIoTSlaveConfigFile();
 814                 iotSlave.commIoTMaster();
 815         }
 816 }