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
  35
  36         /**
  37          * Constructors
  38          */
  39         public IoTRMICall(int _port, String _address, int _rev) throws IOException {
  40
  41                 rmiUtil = new IoTRMIUtil();
  42                 rmiClient = new IoTSocketClient(_port, _address, _rev);
  43         }
  44
  45
  46         /**
  47          * remoteCall() calls a method remotely by passing in parameters and getting a return Object
  48          */
  49         public Object remoteCall(String methodSign, Class<?> retType, Class<?> retGenTypeKey,
  50                         Class<?> retGenTypeVal, Class<?>[] paramCls, Object[] paramObj) {
  51
  52                 // Send method info
  53                 byte[] methodBytes = methodToBytes(methodSign, paramCls, paramObj);
  54                 try {
  55                         rmiClient.sendBytes(methodBytes);
  56                 } catch (IOException ex) {
  57                         ex.printStackTrace();
  58                         throw new Error("IoTRMICall: Error when sending bytes - rmiClient.sendBytes()");
  59                 }
  60                 // Receive return value and return it to caller
  61                 Object retObj = null;
  62                 if (retType != void.class) {
  63                         byte[] retObjBytes = null;
  64                         try {
  65                                 retObjBytes = rmiClient.receiveBytes(retObjBytes);
  66                         } catch (IOException ex) {
  67                                 ex.printStackTrace();
  68                                 throw new Error("IoTRMICall: Error when receiving bytes - rmiClient.receiveBytes()");
  69                         }
  70                         retObj = IoTRMIUtil.getParamObject(retType, retGenTypeKey, retGenTypeVal, retObjBytes);
  71                 }
  72                 return retObj;
  73         }
  74
  75
  76         /**
  77          * methodToBytes() returns byte representation of a method
  78          */
  79         public byte[] methodToBytes(String methodSign, Class<?>[] paramCls, Object[] paramObj) {
  80
  81                 // Get method ID in bytes
  82                 byte[] methodId = IoTRMIUtil.getHashCodeBytes(methodSign);
  83
  84                 // Get byte arrays and calculate method bytes length
  85                 int numbParam = paramObj.length;
  86                 int methodLen = IoTRMIUtil.METHOD_ID_LEN;       // Initialized to the length of method ID
  87                 byte[][] objBytesArr = new byte[numbParam][];
  88                 for (int i=0; i < numbParam; i++) {
  89                         // Get byte arrays for the objects
  90                         objBytesArr[i] = IoTRMIUtil.getObjectBytes(paramObj[i]);
  91                         String clsName = paramCls[i].getSimpleName();
  92                         int paramLen = rmiUtil.getTypeSize(clsName);
  93                         if (paramLen == -1) {           // indefinite length
  94                                 methodLen = methodLen + IoTRMIUtil.PARAM_LEN;
  95                         }
  96                         methodLen = methodLen + objBytesArr[i].length;
  97                 }
  98
  99                 // Construct method in byte array
 100                 byte[] method = new byte[methodLen];
 101                 int pos = 0;
 102                 System.arraycopy(methodId, 0, method, 0, methodId.length);
 103                 pos = pos + IoTRMIUtil.METHOD_ID_LEN;
 104                 // Second iteration for copying bytes
 105                 for (int i=0; i < numbParam; i++) {
 106
 107                         String clsName = paramCls[i].getSimpleName();
 108                         int paramLen = rmiUtil.getTypeSize(clsName);
 109                         if (paramLen == -1) {           // indefinite length
 110                                 paramLen = objBytesArr[i].length;
 111                                 byte[] paramLenBytes = IoTRMIUtil.intToByteArray(paramLen);
 112                                 System.arraycopy(paramLenBytes, 0, method, pos, IoTRMIUtil.PARAM_LEN);
 113                                 pos = pos + IoTRMIUtil.PARAM_LEN;
 114                         }
 115                         System.arraycopy(objBytesArr[i], 0, method, pos, paramLen);
 116                         pos = pos + paramLen;
 117                 }
 118
 119                 return method;
 120         }
 121
 122
 123         public static void main(String[] args) throws Exception {
 124
 125                 String[] test = { "123", "456", "789" };
 126                 byte[] b = IoTRMIUtil.getObjectBytes(test);
 127
 128                 Boolean[] test2 = new Boolean[] { true, false, false };
 129                 byte[] b2 = IoTRMIUtil.getObjectBytes(test2);
 130
 131                 System.out.println(Arrays.toString(b));
 132                 System.out.println(Arrays.toString(b2));
 133
 134                 String[] c = (String[]) IoTRMIUtil.getParamObjectArray(String[].class, b);
 135                 System.out.println(Arrays.toString(c));
 136
 137                 Boolean[] c2 = (Boolean[]) IoTRMIUtil.getParamObjectArray(Boolean[].class, b2);
 138                 System.out.println(Arrays.toString(c2));
 139
 140                 // Set
 141                 /*Set<String> set = new HashSet<String>();
 142                 set.add("1234");
 143                 set.add("5678");
 144
 145                 byte[] objBytes = IoTRMIUtil.getObjectBytes(set);
 146                 System.out.println(Arrays.toString(objBytes));
 147                 Object obj = IoTRMIUtil.getParamObject(Set.class, null, String.class, objBytes);
 148
 149                 @SuppressWarnings("unchecked")
 150                 Set<String> setStr = (Set<String>) obj;
 151                 System.out.println("Set: " + setStr.toString());*/
 152
 153                 // List
 154                 /*List<Long> list = new ArrayList<Long>();
 155                 list.add(12345678l);
 156                 list.add(23455432l);
 157                 list.add(34566543l);
 158
 159                 byte[] objBytes = IoTRMIUtil.getObjectBytes(list);
 160                 System.out.println(Arrays.toString(objBytes));
 161                 Object obj = IoTRMIUtil.getParamObject(List.class, null, Long.class, objBytes);
 162
 163                 @SuppressWarnings("unchecked")
 164                 List<Long> listStr = (List<Long>) obj;
 165                 System.out.println("List: " + listStr.toString());*/
 166
 167                 // Map
 168                 Map<Long,Integer> map = new HashMap<Long,Integer>();
 169                 map.put(12345678l, 1234);
 170                 map.put(23455432l, 5678);
 171                 map.put(34566543l, 4321);
 172
 173                 byte[] objBytes = IoTRMIUtil.getObjectBytes(map);
 174                 System.out.println(Arrays.toString(objBytes));
 175                 Object obj = IoTRMIUtil.getParamObject(Map.class, Long.class, Integer.class, objBytes);
 176
 177                 map = (Map<Long,Integer>) obj;
 178                 System.out.println("Received map: " + map.toString());
 179
 180                 //@SuppressWarnings("unchecked")
 181                 //List<Long> listStr = (List<Long>) obj;
 182                 //System.out.println("List: " + listStr.toString());
 183
 184         }
 185 }