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 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          * waitForPacketsOnClient() starts a thread that waits for packet bytes on client side
  50          */
  51         public void waitForPacketsOnClient() {
  52
  53                 Thread thread = new Thread() {
  54                         public void run() {
  55                                 byte[] packetBytes = null;
  56                                 while(true) {
  57                                         try {
  58                                                 packetBytes = rmiClientRecv.receiveBytes(packetBytes);
  59                                                 if (packetBytes != null) {
  60                                                         int packetType = IoTRMIComm.getPacketType(packetBytes);
  61                                                         if (packetType == IoTRMIUtil.METHOD_TYPE) {
  62                                                                 System.out.println("Method packet: " + Arrays.toString(packetBytes));
  63                                                                 methodQueue.offer(packetBytes);
  64                                                         } else if (packetType == IoTRMIUtil.RET_VAL_TYPE) {
  65                                                                 System.out.println("Return value packet: " + Arrays.toString(packetBytes));
  66                                                                 returnQueue.offer(packetBytes);
  67                                                         } else
  68                                                                 throw new Error("IoTRMICommClient: Packet type is unknown: " + packetType);
  69                                                 } //else
  70                                                 //      Thread.sleep(100);
  71                                                 packetBytes = null;
  72                                         } catch (Exception ex) {
  73                                                 ex.printStackTrace();
  74                                                 throw new Error("IoTRMICommClient: Error receiving return value bytes on client!");
  75                                         }
  76                                 }
  77                         }
  78                 };
  79                 thread.start();
  80         }
  81
  82
  83         /**
  84          * sendReturnObj() for non-struct objects (client side)
  85          */
  86         public synchronized void sendReturnObj(Object retObj, byte[] methodBytes) {
  87
  88                 // Send back return value
  89                 byte[] retObjBytes = IoTRMIUtil.getObjectBytes(retObj);
  90                 // Send return value together with OBJECT_ID and METHOD_ID for arbitration
  91                 int objMethIdLen = IoTRMIUtil.OBJECT_ID_LEN + IoTRMIUtil.METHOD_ID_LEN;
  92                 int headerLen = objMethIdLen + IoTRMIUtil.PACKET_TYPE_LEN;
  93                 byte[] retAllBytes = new byte[headerLen + retObjBytes.length];
  94                 // Copy OBJECT_ID and METHOD_ID
  95                 System.arraycopy(methodBytes, 0, retAllBytes, 0, objMethIdLen);
  96                 int packetType = IoTRMIUtil.RET_VAL_TYPE;       // This is a return value
  97                 byte[] packetTypeBytes = IoTRMIUtil.intToByteArray(packetType);
  98                 System.arraycopy(packetTypeBytes, 0, retAllBytes, objMethIdLen, IoTRMIUtil.PACKET_TYPE_LEN);
  99                 // Copy array of bytes (return object)
 100                 System.arraycopy(retObjBytes, 0, retAllBytes, headerLen, retObjBytes.length);
 101                 try {
 102                         rmiClientSend.sendBytes(retAllBytes);
 103                 } catch (IOException ex) {
 104                         ex.printStackTrace();
 105                         throw new Error("IoTRMICommClient: Error sending bytes in sendReturnObj()!");
 106                 }
 107         }
 108
 109
 110         /**
 111          * sendReturnObj() overloaded to send multiple return objects for structs (client side)
 112          */
 113         public synchronized void sendReturnObj(Class<?>[] retCls, Object[] retObj, byte[] methodBytes) {
 114
 115                 // Send back return value
 116                 byte[] retObjBytes = returnToBytes(retCls, retObj);
 117                 // Send return value together with OBJECT_ID and METHOD_ID for arbitration
 118                 int objMethIdLen = IoTRMIUtil.OBJECT_ID_LEN + IoTRMIUtil.METHOD_ID_LEN;
 119                 int headerLen = objMethIdLen + IoTRMIUtil.PACKET_TYPE_LEN;
 120                 byte[] retAllBytes = new byte[headerLen + retObjBytes.length];
 121                 // Copy OBJECT_ID and METHOD_ID
 122                 System.arraycopy(methodBytes, 0, retAllBytes, 0, objMethIdLen);
 123                 int packetType = IoTRMIUtil.RET_VAL_TYPE;       // This is a return value
 124                 byte[] packetTypeBytes = IoTRMIUtil.intToByteArray(packetType);
 125                 System.arraycopy(packetTypeBytes, 0, retAllBytes, objMethIdLen, IoTRMIUtil.PACKET_TYPE_LEN);
 126                 // Copy array of bytes (return object)
 127                 try {
 128                         rmiClientSend.sendBytes(retAllBytes);
 129                 } catch (IOException ex) {
 130                         ex.printStackTrace();
 131                         throw new Error("IoTRMICommClient: Error sending bytes in sendReturnObj()!");
 132                 }
 133         }
 134
 135
 136         /**
 137          * remoteCall() calls a method remotely by passing in parameters (client side)
 138          */
 139         public synchronized void remoteCall(int objectId, int methodId, Class<?>[] paramCls, Object[] paramObj) {
 140
 141                 // Send method info
 142                 byte[] methodBytes = methodToBytes(objectId, methodId, paramCls, paramObj);
 143                 try {
 144                         rmiClientSend.sendBytes(methodBytes);
 145                 } catch (IOException ex) {
 146                         ex.printStackTrace();
 147                         throw new Error("IoTRMICommClient: Error when sending bytes in remoteCall()!");
 148                 }
 149         }
 150 }