iotjava/iotrmi/Java/IoTRMICommClient.java

   1 package iotrmi.Java;
   2
   3 import java.io.IOException;
   4 import java.nio.ByteBuffer;
   5 import java.util.Arrays;
   6 import java.util.ArrayList;
   7 import java.util.HashMap;
   8 import java.util.List;
   9 import java.util.Map;
  10 import java.util.Set;
  11 import java.lang.reflect.*;
  12
  13 import java.util.concurrent.*;
  14 import java.util.concurrent.atomic.AtomicBoolean;
  15
  16
  17 /** Class IoTRMICommClient is a class that extends IoTRMIComm
  18  *  <p>
  19  *  This is a version of IoTRMIComm that sits on the main stub.
  20  *
  21  * @author      Rahmadi Trimananda <rtrimana @ uci.edu>
  22  * @version     1.0
  23  * @since       2017-01-27
  24  */
  25 public final class IoTRMICommClient extends IoTRMIComm {
  26
  27         /**
  28          * Class Properties
  29          */
  30         private IoTSocketClient rmiClientSend;
  31         private IoTSocketClient rmiClientRecv;
  32
  33
  34         /**
  35          * Constructor (for stub) - send and recv from the perspective of RMI socket servers
  36          */
  37         public IoTRMICommClient(int _localPortSend, int _localPortRecv, int _portSend, int _portRecv, String _address, int _rev) throws
  38                 ClassNotFoundException, InstantiationException,
  39                         IllegalAccessException, IOException {
  40
  41                 super();
  42                 rmiClientRecv = new IoTSocketClient(_localPortSend, _portSend, _address, _rev);
  43                 rmiClientSend = new IoTSocketClient(_localPortRecv, _portRecv, _address, _rev);
  44                 waitForPacketsOnClient();
  45         }
  46
  47
  48         /**
  49          * Constructor (for stub) - only destination port numbers
  50          */
  51         public IoTRMICommClient(int _portSend, int _portRecv, String _address, int _rev) throws
  52                 ClassNotFoundException, InstantiationException,
  53                         IllegalAccessException, IOException {
  54
  55                 super();
  56                 rmiClientRecv = new IoTSocketClient(_portSend, _address, _rev);
  57                 rmiClientSend = new IoTSocketClient(_portRecv, _address, _rev);
  58                 waitForPacketsOnClient();
  59         }
  60
  61
  62         /**
  63          * waitForPacketsOnClient() starts a thread that waits for packet bytes on client side
  64          */
  65         public void waitForPacketsOnClient() {
  66
  67                 Thread thread = new Thread() {
  68                         public void run() {
  69                                 byte[] packetBytes = null;
  70                                 while(true) {
  71                                         try {
  72                                                 packetBytes = rmiClientRecv.receiveBytes(packetBytes);
  73                                                 if (packetBytes != null) {
  74                                                         int packetType = IoTRMIComm.getPacketType(packetBytes);
  75                                                         if (packetType == IoTRMIUtil.METHOD_TYPE) {
  76                                                                 methodQueue.offer(packetBytes);
  77                                                         } else if (packetType == IoTRMIUtil.RET_VAL_TYPE) {
  78                                                                 returnQueue.offer(packetBytes);
  79                                                         } else
  80                                                                 throw new Error("IoTRMICommClient: Packet type is unknown: " + packetType);
  81                                                 }
  82                                                 packetBytes = null;
  83                                         } catch (Exception ex) {
  84                                                 ex.printStackTrace();
  85                                                 throw new Error("IoTRMICommClient: Error receiving return value bytes on client!");
  86                                         }
  87                                 }
  88                         }
  89                 };
  90                 thread.start();
  91         }
  92
  93
  94         /**
  95          * sendReturnObj() for non-struct objects (client side)
  96          */
  97         public synchronized void sendReturnObj(Object retObj, byte[] methodBytes) {
  98
  99                 // Send back return value
 100                 byte[] retObjBytes = null;
 101                 if (retObj != null)     // Handle nullness
 102                         retObjBytes = IoTRMIUtil.getObjectBytes(retObj);
 103                 // Send return value together with OBJECT_ID and METHOD_ID for arbitration
 104                 int objMethIdLen = IoTRMIUtil.OBJECT_ID_LEN + IoTRMIUtil.METHOD_ID_LEN;
 105                 int headerLen = objMethIdLen + IoTRMIUtil.PACKET_TYPE_LEN;
 106                 byte[] retAllBytes = null;
 107                 if (retObj == null)     // Handle nullness
 108                         retAllBytes = new byte[headerLen];
 109                 else
 110                         retAllBytes = new byte[headerLen + retObjBytes.length];
 111                 // Copy OBJECT_ID and METHOD_ID
 112                 System.arraycopy(methodBytes, 0, retAllBytes, 0, objMethIdLen);
 113                 int packetType = IoTRMIUtil.RET_VAL_TYPE;       // This is a return value
 114                 byte[] packetTypeBytes = IoTRMIUtil.intToByteArray(packetType);
 115                 System.arraycopy(packetTypeBytes, 0, retAllBytes, objMethIdLen, IoTRMIUtil.PACKET_TYPE_LEN);
 116                 // Copy array of bytes (return object)
 117                 if (retObj != null)
 118                         System.arraycopy(retObjBytes, 0, retAllBytes, headerLen, retObjBytes.length);
 119                 try {
 120                         rmiClientSend.sendBytes(retAllBytes);
 121                 } catch (IOException ex) {
 122                         ex.printStackTrace();
 123                         throw new Error("IoTRMICommClient: Error sending bytes in sendReturnObj()!");
 124                 }
 125         }
 126
 127
 128         /**
 129          * sendReturnObj() overloaded to send multiple return objects for structs (client side)
 130          */
 131         public synchronized void sendReturnObj(Class<?>[] retCls, Object[] retObj, byte[] methodBytes) {
 132
 133                 // Send back return value
 134                 byte[] retObjBytes = returnToBytes(retCls, retObj);
 135                 // Send return value together with OBJECT_ID and METHOD_ID for arbitration
 136                 int objMethIdLen = IoTRMIUtil.OBJECT_ID_LEN + IoTRMIUtil.METHOD_ID_LEN;
 137                 int headerLen = objMethIdLen + IoTRMIUtil.PACKET_TYPE_LEN;
 138                 byte[] retAllBytes = new byte[headerLen + retObjBytes.length];
 139                 // Copy OBJECT_ID and METHOD_ID
 140                 System.arraycopy(methodBytes, 0, retAllBytes, 0, objMethIdLen);
 141                 int packetType = IoTRMIUtil.RET_VAL_TYPE;       // This is a return value
 142                 byte[] packetTypeBytes = IoTRMIUtil.intToByteArray(packetType);
 143                 System.arraycopy(packetTypeBytes, 0, retAllBytes, objMethIdLen, IoTRMIUtil.PACKET_TYPE_LEN);
 144                 // Copy array of bytes (return object)
 145                 try {
 146                         rmiClientSend.sendBytes(retAllBytes);
 147                 } catch (IOException ex) {
 148                         ex.printStackTrace();
 149                         throw new Error("IoTRMICommClient: Error sending bytes in sendReturnObj()!");
 150                 }
 151         }
 152
 153
 154         /**
 155          * remoteCall() calls a method remotely by passing in parameters (client side)
 156          */
 157         public synchronized void remoteCall(int objectId, int methodId, Class<?>[] paramCls, Object[] paramObj) {
 158
 159                 // Send method info
 160                 byte[] methodBytes = methodToBytes(objectId, methodId, paramCls, paramObj);
 161                 try {
 162                         rmiClientSend.sendBytes(methodBytes);
 163                 } catch (IOException ex) {
 164                         ex.printStackTrace();
 165                         throw new Error("IoTRMICommClient: Error when sending bytes in remoteCall()!");
 166                 }
 167         }
 168 }