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, String[] _methodSign) throws IOException {
  41
  42                 rmiUtil = new IoTRMIUtil();
  43                 rmiClient = new IoTSocketClient(_port, _address, _rev);
  44                 listMethodId = Arrays.asList(_methodSign); // Initialize the method ID map
  45         }
  46
  47
  48         /**
  49          * remoteCall() calls a method remotely by passing in parameters and getting a return Object
  50          */
  51         public synchronized Object remoteCall(int objectId, String methodSign, Class<?> retType, Class<?> retGenTypeKey,
  52                         Class<?> retGenTypeVal, Class<?>[] paramCls, Object[] paramObj) {
  53
  54                 // Send method info
  55                 byte[] methodBytes = methodToBytes(objectId, methodSign, paramCls, paramObj);
  56                 try {
  57                         rmiClient.sendBytes(methodBytes);
  58                 } catch (IOException ex) {
  59                         ex.printStackTrace();
  60                         throw new Error("IoTRMICall: Error when sending bytes - rmiClient.sendBytes()");
  61                 }
  62                 // Receive return value and return it to caller
  63                 Object retObj = null;
  64                 if (retType != void.class) {
  65                         byte[] retObjBytes = null;
  66                         try {
  67                                 retObjBytes = rmiClient.receiveBytes(retObjBytes);
  68                         } catch (IOException ex) {
  69                                 ex.printStackTrace();
  70                                 throw new Error("IoTRMICall: Error when receiving bytes - rmiClient.receiveBytes()");
  71                         }
  72                         retObj = IoTRMIUtil.getParamObject(retType, retGenTypeKey, retGenTypeVal, retObjBytes);
  73                 }
  74                 return retObj;
  75         }
  76
  77
  78         /**
  79          * methodToBytes() returns byte representation of a method
  80          */
  81         public byte[] methodToBytes(int objectId, String methodSign, Class<?>[] paramCls, Object[] paramObj) {
  82
  83                 // Initialized to the length of method ID
  84                 int methodLen = IoTRMIUtil.OBJECT_ID_LEN;
  85                 byte[] objId = IoTRMIUtil.intToByteArray(objectId);
  86                 // Get method ID in bytes
  87                 int methId = listMethodId.indexOf(methodSign);
  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         public static void main(String[] args) throws Exception {
 130
 131                 String[] test = { "123", "456", "789" };
 132                 byte[] b = IoTRMIUtil.getObjectBytes(test);
 133
 134                 Boolean[] test2 = new Boolean[] { true, false, false };
 135                 byte[] b2 = IoTRMIUtil.getObjectBytes(test2);
 136
 137                 System.out.println(Arrays.toString(b));
 138                 System.out.println(Arrays.toString(b2));
 139
 140                 String[] c = (String[]) IoTRMIUtil.getParamObjectArray(String[].class, b);
 141                 System.out.println(Arrays.toString(c));
 142
 143                 Boolean[] c2 = (Boolean[]) IoTRMIUtil.getParamObjectArray(Boolean[].class, b2);
 144                 System.out.println(Arrays.toString(c2));
 145
 146                 // Set
 147                 /*Set<String> set = new HashSet<String>();
 148                 set.add("1234");
 149                 set.add("5678");
 150
 151                 byte[] objBytes = IoTRMIUtil.getObjectBytes(set);
 152                 System.out.println(Arrays.toString(objBytes));
 153                 Object obj = IoTRMIUtil.getParamObject(Set.class, null, String.class, objBytes);
 154
 155                 @SuppressWarnings("unchecked")
 156                 Set<String> setStr = (Set<String>) obj;
 157                 System.out.println("Set: " + setStr.toString());*/
 158
 159                 // List
 160                 /*List<Long> list = new ArrayList<Long>();
 161                 list.add(12345678l);
 162                 list.add(23455432l);
 163                 list.add(34566543l);
 164
 165                 byte[] objBytes = IoTRMIUtil.getObjectBytes(list);
 166                 System.out.println(Arrays.toString(objBytes));
 167                 Object obj = IoTRMIUtil.getParamObject(List.class, null, Long.class, objBytes);
 168
 169                 @SuppressWarnings("unchecked")
 170                 List<Long> listStr = (List<Long>) obj;
 171                 System.out.println("List: " + listStr.toString());*/
 172
 173                 // Map
 174                 Map<Long,Integer> map = new HashMap<Long,Integer>();
 175                 map.put(12345678l, 1234);
 176                 map.put(23455432l, 5678);
 177                 map.put(34566543l, 4321);
 178
 179                 byte[] objBytes = IoTRMIUtil.getObjectBytes(map);
 180                 System.out.println(Arrays.toString(objBytes));
 181                 Object obj = IoTRMIUtil.getParamObject(Map.class, Long.class, Integer.class, objBytes);
 182
 183                 map = (Map<Long,Integer>) obj;
 184                 System.out.println("Received map: " + map.toString());
 185
 186                 //@SuppressWarnings("unchecked")
 187                 //List<Long> listStr = (List<Long>) obj;
 188                 //System.out.println("List: " + listStr.toString());
 189
 190         }
 191 }