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                 try {
  56                         rmiClient.sendBytes(methodBytes);
  57                 } catch (IOException ex) {
  58                         ex.printStackTrace();
  59                         throw new Error("IoTRMICall: Error when sending bytes - rmiClient.sendBytes()");
  60                 }
  61                 // Receive return value and return it to caller
  62                 Object retObj = null;
  63                 if (retType != void.class) {
  64                         byte[] retObjBytes = null;
  65                         try {
  66                                 retObjBytes = rmiClient.receiveBytes(retObjBytes);
  67                         } catch (IOException ex) {
  68                                 ex.printStackTrace();
  69                                 throw new Error("IoTRMICall: Error when receiving bytes - rmiClient.receiveBytes()");
  70                         }
  71                         retObj = IoTRMIUtil.getParamObject(retType, retGenTypeVal, retObjBytes);
  72                 }
  73                 return retObj;
  74         }
  75
  76
  77         /**
  78          * methodToBytes() returns byte representation of a method
  79          */
  80         public byte[] methodToBytes(int objectId, int methId, Class<?>[] paramCls, Object[] paramObj) {
  81
  82                 // Initialized to the length of method ID
  83                 int methodLen = IoTRMIUtil.OBJECT_ID_LEN;
  84                 byte[] objId = IoTRMIUtil.intToByteArray(objectId);
  85                 // Get method ID in bytes
  86                 byte[] methodId = IoTRMIUtil.intToByteArray(methId);
  87                 // Get byte arrays and calculate method bytes length
  88                 int numbParam = paramObj.length;
  89                 methodLen = methodLen + IoTRMIUtil.METHOD_ID_LEN;
  90                 byte[][] objBytesArr = new byte[numbParam][];
  91                 for (int i = 0; i < numbParam; i++) {
  92                         // Get byte arrays for the objects
  93                         objBytesArr[i] = IoTRMIUtil.getObjectBytes(paramObj[i]);
  94                         String clsName = paramCls[i].getSimpleName();
  95                         int paramLen = rmiUtil.getTypeSize(clsName);
  96                         if (paramLen == -1) {           // indefinite length - store the length first
  97                                 methodLen = methodLen + IoTRMIUtil.PARAM_LEN;
  98                         }
  99                         methodLen = methodLen + objBytesArr[i].length;
 100                 }
 101                 // Construct method in byte array
 102                 byte[] method = new byte[methodLen];
 103                 int pos = 0;
 104                 System.arraycopy(objId, 0, method, 0, IoTRMIUtil.METHOD_ID_LEN);
 105                 pos = pos + IoTRMIUtil.OBJECT_ID_LEN;
 106                 System.arraycopy(methodId, 0, method, pos, IoTRMIUtil.METHOD_ID_LEN);
 107                 pos = pos + IoTRMIUtil.METHOD_ID_LEN;
 108                 // Second iteration for copying bytes
 109                 for (int i = 0; i < numbParam; i++) {
 110
 111                         String clsName = paramCls[i].getSimpleName();
 112                         int paramLen = rmiUtil.getTypeSize(clsName);
 113                         if (paramLen == -1) {           // indefinite length
 114                                 paramLen = objBytesArr[i].length;
 115                                 byte[] paramLenBytes = IoTRMIUtil.intToByteArray(paramLen);
 116                                 System.arraycopy(paramLenBytes, 0, method, pos, IoTRMIUtil.PARAM_LEN);
 117                                 pos = pos + IoTRMIUtil.PARAM_LEN;
 118                         }
 119                         System.arraycopy(objBytesArr[i], 0, method, pos, paramLen);
 120                         pos = pos + paramLen;
 121                 }
 122
 123                 return method;
 124         }
 125
 126
 127         /**
 128          * remoteCall() calls a method remotely by passing in parameters and getting a return Object
 129          */
 130         public synchronized Object[] getStructObjects(Class<?>[] retType, Class<?>[] retGenTypeVal) {
 131
 132                 // Receive return value and return it to caller
 133                 Object[] retObj = null;
 134                 byte[] retObjBytes = null;
 135                 try {
 136                         retObjBytes = rmiClient.receiveBytes(retObjBytes);
 137                 } catch (IOException ex) {
 138                         ex.printStackTrace();
 139                         throw new Error("IoTRMICall: Error when receiving bytes - rmiClient.receiveBytes()");
 140                 }
 141                 retObj = getReturnObjects(retObjBytes, retType, retGenTypeVal);
 142
 143                 return retObj;
 144         }
 145
 146
 147         public Object[] getReturnObjects(byte[] retBytes, Class<?>[] arrCls, Class<?>[] arrGenValCls) {
 148
 149                 // Byte scanning position
 150                 int pos = 0;
 151                 Object[] retObj = new Object[arrCls.length];
 152                 for (int i=0; i < arrCls.length; i++) {
 153
 154                         String retType = arrCls[i].getSimpleName();
 155                         int retSize = rmiUtil.getTypeSize(retType);
 156                         // Get the 32-bit field in the byte array to get the actual
 157                         //              length (this is a param with indefinite length)
 158                         if (retSize == -1) {
 159                                 byte[] bytRetLen = new byte[IoTRMIUtil.RETURN_LEN];
 160                                 System.arraycopy(retBytes, pos, bytRetLen, 0, IoTRMIUtil.RETURN_LEN);
 161                                 pos = pos + IoTRMIUtil.RETURN_LEN;
 162                                 retSize = IoTRMIUtil.byteArrayToInt(bytRetLen);
 163                         }
 164                         byte[] retObjBytes = new byte[retSize];
 165                         System.arraycopy(retBytes, pos, retObjBytes, 0, retSize);
 166                         pos = pos + retSize;
 167                         retObj[i] = IoTRMIUtil.getParamObject(arrCls[i], arrGenValCls[i], retObjBytes);
 168                 }
 169
 170                 return retObj;
 171         }
 172 }