iotjava/iotrmi/Java/IoTRMICall.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.lang.reflect.Method;
  11
  12 import java.util.HashSet;
  13 import java.util.Set;
  14
  15
  16 /** Class IoTRMICall is a class that serves method calls on stub.
  17  *  <p>
  18  *  A stub will use an object of this class to send the method
  19  *  information, e.g. object identifier, method identifier, and
  20  *  parameters.
  21  *
  22  * @author      Rahmadi Trimananda <rtrimana @ uci.edu>
  23  * @version     1.0
  24  * @since       2016-10-04
  25  */
  26 public class IoTRMICall {
  27
  28
  29         /**
  30          * Class Properties
  31          */
  32         private IoTRMIUtil rmiUtil;
  33         private IoTSocketClient rmiClient;
  34         //private List<String> listMethodId;    // Map from method ID to signature
  35
  36
  37         /**
  38          * Constructors
  39          */
  40         public IoTRMICall(int _port, String _address, int _rev) throws IOException {
  41
  42                 rmiUtil = new IoTRMIUtil();
  43                 rmiClient = new IoTSocketClient(_port, _address, _rev);
  44         }
  45
  46
  47         /**
  48          * remoteCall() calls a method remotely by passing in parameters and getting a return Object
  49          */
  50         public synchronized Object remoteCall(int objectId, int methodId, Class<?> retType,
  51                         Class<?> retGenTypeVal, Class<?>[] paramCls, Object[] paramObj) {
  52
  53                 // Send method info
  54                 byte[] methodBytes = methodToBytes(objectId, methodId, paramCls, paramObj);
  55                 //System.out.println("Method RMICall: " + Arrays.toString(methodBytes));
  56                 try {
  57                         rmiClient.sendBytes(methodBytes);
  58                         //System.out.println("Sent bytes RMICall!!!");
  59                 } catch (IOException ex) {
  60                         ex.printStackTrace();
  61                         throw new Error("IoTRMICall: Error when sending bytes - rmiClient.sendBytes()");
  62                 }
  63                 // Receive return value and return it to caller
  64                 Object retObj = null;
  65                 if (retType != void.class) {
  66                         byte[] retObjBytes = null;
  67                         try {
  68                                 retObjBytes = rmiClient.receiveBytes(retObjBytes);
  69                         } catch (IOException ex) {
  70                                 ex.printStackTrace();
  71                                 throw new Error("IoTRMICall: Error when receiving bytes - rmiClient.receiveBytes()");
  72                         }
  73                         retObj = IoTRMIUtil.getParamObject(retType, retGenTypeVal, retObjBytes);
  74                 }
  75                 return retObj;
  76         }
  77
  78
  79         /**
  80          * methodToBytes() returns byte representation of a method
  81          */
  82         public byte[] methodToBytes(int objectId, int methId, Class<?>[] paramCls, Object[] paramObj) {
  83
  84                 // Initialized to the length of method ID
  85                 int methodLen = IoTRMIUtil.OBJECT_ID_LEN;
  86                 byte[] objId = IoTRMIUtil.intToByteArray(objectId);
  87                 // Get method ID in bytes
  88                 byte[] methodId = IoTRMIUtil.intToByteArray(methId);
  89                 // Get byte arrays and calculate method bytes length
  90                 int numbParam = paramObj.length;
  91                 methodLen = methodLen + IoTRMIUtil.METHOD_ID_LEN;
  92                 byte[][] objBytesArr = new byte[numbParam][];
  93                 for (int i = 0; i < numbParam; i++) {
  94                         // Get byte arrays for the objects
  95                         objBytesArr[i] = IoTRMIUtil.getObjectBytes(paramObj[i]);
  96                         String clsName = paramCls[i].getSimpleName();
  97                         int paramLen = rmiUtil.getTypeSize(clsName);
  98                         if (paramLen == -1) {           // indefinite length - store the length first
  99                                 methodLen = methodLen + IoTRMIUtil.PARAM_LEN;
 100                         }
 101                         methodLen = methodLen + objBytesArr[i].length;
 102                 }
 103                 // Construct method in byte array
 104                 byte[] method = new byte[methodLen];
 105                 int pos = 0;
 106                 System.arraycopy(objId, 0, method, 0, IoTRMIUtil.METHOD_ID_LEN);
 107                 pos = pos + IoTRMIUtil.OBJECT_ID_LEN;
 108                 System.arraycopy(methodId, 0, method, pos, IoTRMIUtil.METHOD_ID_LEN);
 109                 pos = pos + IoTRMIUtil.METHOD_ID_LEN;
 110                 // Second iteration for copying bytes
 111                 for (int i = 0; i < numbParam; i++) {
 112
 113                         String clsName = paramCls[i].getSimpleName();
 114                         int paramLen = rmiUtil.getTypeSize(clsName);
 115                         if (paramLen == -1) {           // indefinite length
 116                                 paramLen = objBytesArr[i].length;
 117                                 byte[] paramLenBytes = IoTRMIUtil.intToByteArray(paramLen);
 118                                 System.arraycopy(paramLenBytes, 0, method, pos, IoTRMIUtil.PARAM_LEN);
 119                                 pos = pos + IoTRMIUtil.PARAM_LEN;
 120                         }
 121                         System.arraycopy(objBytesArr[i], 0, method, pos, paramLen);
 122                         pos = pos + paramLen;
 123                 }
 124
 125                 return method;
 126         }
 127
 128
 129         /**
 130          * remoteCall() calls a method remotely by passing in parameters and getting a return Object
 131          */
 132         public synchronized Object[] getStructObjects(Class<?>[] retType, Class<?>[] retGenTypeVal) {
 133
 134                 // Receive return value and return it to caller
 135                 Object[] retObj = null;
 136                 byte[] retObjBytes = null;
 137                 try {
 138                         retObjBytes = rmiClient.receiveBytes(retObjBytes);
 139                 } catch (IOException ex) {
 140                         ex.printStackTrace();
 141                         throw new Error("IoTRMICall: Error when receiving bytes - rmiClient.receiveBytes()");
 142                 }
 143                 retObj = getReturnObjects(retObjBytes, retType, retGenTypeVal);
 144
 145                 return retObj;
 146         }
 147
 148
 149         public Object[] getReturnObjects(byte[] retBytes, Class<?>[] arrCls, Class<?>[] arrGenValCls) {
 150
 151                 // Byte scanning position
 152                 int pos = 0;
 153                 Object[] retObj = new Object[arrCls.length];
 154                 for (int i=0; i < arrCls.length; i++) {
 155
 156                         String retType = arrCls[i].getSimpleName();
 157                         int retSize = rmiUtil.getTypeSize(retType);
 158                         // Get the 32-bit field in the byte array to get the actual
 159                         //              length (this is a param with indefinite length)
 160                         if (retSize == -1) {
 161                                 byte[] bytRetLen = new byte[IoTRMIUtil.RETURN_LEN];
 162                                 System.arraycopy(retBytes, pos, bytRetLen, 0, IoTRMIUtil.RETURN_LEN);
 163                                 pos = pos + IoTRMIUtil.RETURN_LEN;
 164                                 retSize = IoTRMIUtil.byteArrayToInt(bytRetLen);
 165                         }
 166                         byte[] retObjBytes = new byte[retSize];
 167                         System.arraycopy(retBytes, pos, retObjBytes, 0, retSize);
 168                         pos = pos + retSize;
 169                         retObj[i] = IoTRMIUtil.getParamObject(arrCls[i], arrGenValCls[i], retObjBytes);
 170                 }
 171
 172                 return retObj;
 173         }
 174 }