CalibrationServlet.java
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package servlet;
import core.service.CalibrationService;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.util.Random;
/**
* Servlet handling calibration request coming from clients.
*
* Created by Guillaume on 15/05/2017.
*/
public class CalibrationServlet extends HttpServlet{
public void execute (final HttpServletRequest servletRequest, final HttpServletResponse servletResponse)
throws ServletException, IOException {
try {
String clientMacAddr = servletRequest.getParameter("CLIENT_MAC_ADDR");
int mapId = Integer.parseInt(servletRequest.getParameter("MAP_ID"));
double posx = Double.parseDouble(servletRequest.getParameter("X"));
double posy = Double.parseDouble(servletRequest.getParameter("Y"));
Integer locationId = new CalibrationService().registerLocation(posx, posy, mapId);
if(locationId!=-1){
multicastCalibrationRequest(clientMacAddr, locationId);
}else{
try{
servletResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}catch(IllegalStateException ex){
ex.printStackTrace();
}
}
}catch(Exception e){
e.printStackTrace();
try{
servletResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
}catch(IllegalStateException ex){
ex.printStackTrace();
}
}
servletResponse.setStatus(200);
}
@Override
public void doGet(final HttpServletRequest servletRequest, final HttpServletResponse servletResponse)
throws ServletException, IOException {
execute(servletRequest, servletResponse);
}
@Override
public void doPost(final HttpServletRequest servletRequest, final HttpServletResponse servletResponse)
throws ServletException, IOException {
execute(servletRequest, servletResponse);
}
/**
* Method broadcasting UPD request to AP, request asking fo calibration data.
* @param clientMacAddress mac address of client on which ap's measurement will be based
* @param locationId id of corresponding location in database
*/
private void multicastCalibrationRequest(String clientMacAddress, int locationId){
try (DatagramSocket socket = new DatagramSocket(4445)){
byte[] buf;
String dString = "{\"CALIB\": \"" + clientMacAddress + "\", \"SERV\": \"" + Inet4Address.getLocalHost().getHostAddress()+"\", \"LOC_ID\": \""+locationId+"\"}";
buf = dString.getBytes();
// send it
InetAddress group = InetAddress.getByName("10.255.255.255");
DatagramPacket packet = new DatagramPacket(buf, buf.length, group, 4446);
socket.send(packet);
} catch (IOException e) {
e.printStackTrace();
}
}
}