import java.util.Set;
import java.lang.reflect.*;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
/** Class IoTRMIObject is a class that stores info of an object.
* <p>
* @version 1.0
* @since 2016-10-03
*/
-public class IoTRMIObject {
+public final class IoTRMIObject {
/**
* Class Properties
private IoTRMIUtil rmiUtil;
private IoTSocketServer rmiServer;
private byte[] methodBytes;
+ private Lock lock = new ReentrantLock();
/**
* Constructors
*/
- public IoTRMIObject(int _port, String[] _methodSign) throws
+ public IoTRMIObject(int _port) throws
ClassNotFoundException, InstantiationException,
IllegalAccessException, IOException {
rmiUtil = new IoTRMIUtil();
- listMethodId2Sign = Arrays.asList(_methodSign); // Initialize the method ID list
methodBytes = null;
rmiServer = new IoTSocketServer(_port);
rmiServer.connect();
/**
- * sendReturnObj() sends back return Object to client
+ * getMethodBytes() waits for method transmission in bytes
*/
- public void sendReturnObj(Object retObj) throws IOException {
+ public byte[] getMethodBytes() throws IOException {
- // Send back return value
- byte[] retObjBytes = IoTRMIUtil.getObjectBytes(retObj);
- rmiServer.sendBytes(retObjBytes);
+ // Receive method info
+ //System.out.println("Method RMIObj before: " + Arrays.toString(methodBytes));
+ methodBytes = rmiServer.receiveBytes(methodBytes);
+ //System.out.println("Method RMIObj after: " + Arrays.toString(methodBytes));
+ return methodBytes;
}
/**
- * getMethodBytes() waits for method transmission in bytes
+ * getObjectId() gets object Id from bytes
*/
- public void getMethodBytes() throws IOException {
+ public int getObjectId() {
+
+ // Get object Id bytes
+ byte[] objectIdBytes = new byte[IoTRMIUtil.OBJECT_ID_LEN];
+ System.arraycopy(methodBytes, 0, objectIdBytes, 0, IoTRMIUtil.OBJECT_ID_LEN);
+ // Get object Id
+ int objectId = IoTRMIUtil.byteArrayToInt(objectIdBytes);
+ return objectId;
+ }
- // Receive method info
- methodBytes = rmiServer.receiveBytes(methodBytes);
+
+ /**
+ * static version of getObjectId()
+ */
+ public static int getObjectId(byte[] methodBytes) {
+
+ // Get object Id bytes
+ byte[] objectIdBytes = new byte[IoTRMIUtil.OBJECT_ID_LEN];
+ System.arraycopy(methodBytes, 0, objectIdBytes, 0, IoTRMIUtil.OBJECT_ID_LEN);
+ // Get object Id
+ int objectId = IoTRMIUtil.byteArrayToInt(objectIdBytes);
+ return objectId;
}
/**
- * getSignature() gets method signature from bytes
+ * setMethodBytes() sets bytes for method
*/
- public String getSignature() {
+ /*public void setMethodBytes(byte[] _methodBytes) throws IOException {
+
+ // Set method bytes
+ methodBytes = _methodBytes;
+ }*/
+
+
+ /**
+ * getMethodId() gets method Id from bytes
+ */
+ public int getMethodId() {
// Get method Id bytes
byte[] methodIdBytes = new byte[IoTRMIUtil.METHOD_ID_LEN];
- System.arraycopy(methodBytes, 0, methodIdBytes, 0, IoTRMIUtil.METHOD_ID_LEN);
+ // Method Id is positioned after object Id in the byte array
+ System.arraycopy(methodBytes, IoTRMIUtil.OBJECT_ID_LEN, methodIdBytes, 0, IoTRMIUtil.METHOD_ID_LEN);
// Get method Id
int methodId = IoTRMIUtil.byteArrayToInt(methodIdBytes);
- // Get method signature from the list
- return listMethodId2Sign.get(methodId);
+ // Get method Id
+ return methodId;
+ }
+
+
+ /**
+ * static version of getMethodId()
+ */
+ public static int getMethodId(byte[] methodBytes) {
+
+ // Get method Id bytes
+ byte[] methodIdBytes = new byte[IoTRMIUtil.METHOD_ID_LEN];
+ // Method Id is positioned after object Id in the byte array
+ System.arraycopy(methodBytes, IoTRMIUtil.OBJECT_ID_LEN, methodIdBytes, 0, IoTRMIUtil.METHOD_ID_LEN);
+ // Get method Id
+ int methodId = IoTRMIUtil.byteArrayToInt(methodIdBytes);
+ // Get method Id
+ return methodId;
}
* getMethodParams() gets method params based on byte array received
* <p>
* Basically this is the format of a method in bytes:
- * 1) 32-bit value of method ID (hash code)
- * 2) m parameters with n-bit value each (m x n-bit)
+ * 1) 32-bit value of object ID
+ * 2) 32-bit value of method ID
+ * 3) m parameters with n-bit value each (m x n-bit)
* For the parameters that don't have definite length,
* we need to extract the length from a preceding 32-bit
* field in front of it.
*
* For primitive objects:
- * | 32-bit method ID | m-bit actual data (fixed length) |
+ * | 32-bit object ID | 32-bit method ID | m-bit actual data (fixed length) | ...
*
* For string, arrays, and non-primitive objects:
- * | 32-bit method ID | 32-bit length | n-bit actual data | ...
+ * | 32-bit object ID | 32-bit method ID | 32-bit length | n-bit actual data | ...
*
*/
- public Object[] getMethodParams(Class<?>[] arrCls, Class<?>[] arrGenKeyCls, Class<?>[] arrGenValCls) {
+ public Object[] getMethodParams(Class<?>[] arrCls, Class<?>[] arrGenValCls) {
// Byte scanning position
- int pos = IoTRMIUtil.METHOD_ID_LEN;
+ int pos = IoTRMIUtil.OBJECT_ID_LEN + IoTRMIUtil.METHOD_ID_LEN;
Object[] paramObj = new Object[arrCls.length];
for (int i=0; i < arrCls.length; i++) {
byte[] paramBytes = new byte[paramSize];
System.arraycopy(methodBytes, pos, paramBytes, 0, paramSize);
pos = pos + paramSize;
- paramObj[i] = IoTRMIUtil.getParamObject(arrCls[i], arrGenKeyCls[i],
- arrGenValCls[i], paramBytes);
+ paramObj[i] = IoTRMIUtil.getParamObject(arrCls[i], arrGenValCls[i], paramBytes);
}
return paramObj;
}
+
+
+ /**
+ * sendReturnObj() sends back return Object to client
+ */
+ public void sendReturnObj(Object retObj) throws IOException {
+
+ // Send back return value
+ byte[] retObjBytes = IoTRMIUtil.getObjectBytes(retObj);
+ rmiServer.sendBytes(retObjBytes);
+ }
+
+
+ /**
+ * sendReturnObj() overloaded to send multiple return objects for structs
+ */
+ public void sendReturnObj(Class<?>[] retCls, Object[] retObj) throws IOException {
+
+ // Send back return value
+ byte[] retObjBytes = returnToBytes(retCls, retObj);
+ rmiServer.sendBytes(retObjBytes);
+ }
+
+
+ /**
+ * returnToBytes() takes array of objects and generates bytes
+ */
+ public byte[] returnToBytes(Class<?>[] retCls, Object[] retObj) {
+
+ // Get byte arrays and calculate method bytes length
+ int numbRet = retObj.length;
+ int retLen = 0;
+ byte[][] objBytesArr = new byte[numbRet][];
+ for (int i = 0; i < numbRet; i++) {
+ // Get byte arrays for the objects
+ objBytesArr[i] = IoTRMIUtil.getObjectBytes(retObj[i]);
+ String clsName = retCls[i].getSimpleName();
+ int retObjLen = rmiUtil.getTypeSize(clsName);
+ if (retObjLen == -1) { // indefinite length - store the length first
+ retLen = retLen + IoTRMIUtil.RETURN_LEN;
+ }
+ retLen = retLen + objBytesArr[i].length;
+ }
+ // Construct return in byte array
+ byte[] retBytes = new byte[retLen];
+ int pos = 0;
+ // Iteration for copying bytes
+ for (int i = 0; i < numbRet; i++) {
+
+ String clsName = retCls[i].getSimpleName();
+ int retObjLen = rmiUtil.getTypeSize(clsName);
+ if (retObjLen == -1) { // indefinite length
+ retObjLen = objBytesArr[i].length;
+ byte[] retLenBytes = IoTRMIUtil.intToByteArray(retObjLen);
+ System.arraycopy(retLenBytes, 0, retBytes, pos, IoTRMIUtil.RETURN_LEN);
+ pos = pos + IoTRMIUtil.RETURN_LEN;
+ }
+ System.arraycopy(objBytesArr[i], 0, retBytes, pos, retObjLen);
+ pos = pos + retObjLen;
+ }
+
+ return retBytes;
+ }
}