private static void requestLocalServerInformation(final ComputerLocal xcl) {
// int ownid = -1;
// for (int i = 0; i < Constants.getVecCl().size(); i++) {
// if (xcl.equals(Constants.getVecCl().get(i))) {
// ownid = i;
// }
// }
for (ComputerLocal c : Constants.getVecCl()) {
//
// Send "HELLO" - message
DatagramPacket dp =
Utils.createDatagramPackage(
Staticio.SERVER_INFO_REQUEST + xcl.generateInformationString(),
xcl.getLocalLocation(),
Utils.getBroadcastAddressLocalhost());
Staticio.handleMessageIn(dp, c, null);
}
}
/**
* Sends the String {@value #SERVER_INFO_REQUEST} contained by the static and final String {@link
* #SERVER_INFO_REQUEST} to server with specified InetAdress and port.
*
* @param xadr the server's InetAddress,
* @param xport the server's port.
* @return the DatagramPacket that consists of the server's response. In case the operation
* failed, the return value is null.
* @author Julius Huelsmann
* @version %I%, %U%
* @since 1.0
*/
public static final DatagramPacket requestServerInformation(
final InetAddress xadr, final int xport, final ComputerLocal xcl) {
//
// Threshold: if the instance of InetAddress is null, return null
if (xadr == null) {
return null;
}
DatagramSocket socket = null;
try {
// Send QUESTION:
// Open socket, send datagramPackage and close the socket.
socket = new DatagramSocket(xport);
socket.setSoTimeout(Constants.socketTimeout);
// Generate DatagramPacket and DatagramSocket for the transmission.
// Generate information string and prepare DatagramPacket that will be
// sent during the next step.
final String infoString = Staticio.SERVER_INFO_REQUEST + xcl.generateInformationString();
final String requestStatus =
Staticio.sendStringServerinfoRequest(xadr, xport, xcl, socket, infoString);
socket.close();
socket = null; //
// View.print(requestStatus);
socket = new DatagramSocket(xport);
socket.setSoTimeout(Constants.socketTimeout);
byte[] buf1 = new byte[Constants.BUFFERSIZE];
DatagramPacket receivedData = new DatagramPacket(buf1, buf1.length);
socket.receive(receivedData);
// final String messageIn =
new String(receivedData.getData()).substring(0, receivedData.getLength());
//
// If the message's origin is not the current computer.
if (!receivedData.getAddress().getHostAddress().equals(FetchServer.getAddress())) {
View.networkout(
FetchClient.class.getSimpleName(),
receivedData.getAddress().getHostAddress(),
xport,
infoString,
true);
Staticio.handleMessageIn(receivedData, xcl, socket);
}
socket.close();
socket = null;
buf1 = null;
return receivedData;
} catch (IOException e) {
System.out.println(e);
try {
if (socket != null) {
socket.close();
socket = null;
}
} catch (Exception i) {
return null;
}
return null;
}
}