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/* NetCalendar 2006, 2009 (c) Dipl.-Inform. (FH) Paul C. Buetow
* http://buetow.org - netcalendar@dev.buetow.org
*/
/**
*
*/
package client;
import java.io.*;
import java.net.*;
import java.security.*;
import javax.net.*;
import javax.net.ssl.*;
import shared.*;
import shared.remotecall.*;
/**
* This class only has static members. Its used for creating a client socket to connect and
* communicate with the calendar server.
* @author Paul C. Buetow
*/
public class ServerRequester {
/**
* This method creates a new client socket.
* @return Returns a client socket object.
* @throws IOException
*/
private static Socket makeClientSocket() throws IOException {
if (!Config.getBooleanValue("use_ssl")) {
Main.statusMessage("Making non-SSL Socket...");
return new Socket(Config.getServerAddress(), Config.getIntValue("server_port"));
}
Main.statusMessage("Making SSL Socket...");
//Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
SocketFactory socketFactory = SSLSocketFactory.getDefault();
return socketFactory.createSocket(Config.getServerAddress(), Config.getIntValue("server_port"));
}
/**
* Sends a client request to the netcalendar server end receives a server response object.
* @param clientRequest Specifies the client request to send to the calendar server.
* @return Returns the server response. It returns null if no response is available.
*/
public final static ServerResponse sendClientRequest(ClientRequest clientRequest) {
Main.statusMessage("Sending client request to server...");
ServerResponse serverResponse = null;
try {
Socket socket = makeClientSocket();
socket.setKeepAlive(true);
// Send the client request to the server
OutputStream outputStream = socket.getOutputStream();
ObjectOutput objectOutput = new ObjectOutputStream(outputStream);
objectOutput.writeObject(clientRequest);
objectOutput.flush();
// We only want to receive data if the request new events, not if we only send
// changed events!
if (clientRequest.requestsNewEvents()) {
// Recieve the server's response
InputStream inputStream = socket.getInputStream();
ObjectInput objectInput = new ObjectInputStream(inputStream);
serverResponse = (ServerResponse) objectInput.readObject();
}
objectOutput.close();
socket.close();
} catch (Exception e) {
Main.infoMessage("Client error during serialization: " + e.getMessage());
Main.statusMessage("Error: Client request did not succeed! Server down?");
return serverResponse;
}
Main.statusMessage("Last client request succeeded");
// Returns null if no response is available!
return serverResponse;
}
}
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