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package org.libreoffice.impressremote.communication;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.Collection;
import java.util.HashMap;
import org.libreoffice.impressremote.communication.Server.Protocol;
import android.content.Context;
import android.content.Intent;
public class ServerFinder {
private Context mContext;
private static final int PORT = 1598;
private static final String GROUPADDRESS = "239.0.0.1";
private static final String CHARSET = "UTF-8";
private static final long SEARCH_INTERVAL = 1000 * 20;
private DatagramSocket mSocket = null;
private Thread mListenerThread = null;
private boolean mFinishRequested = false;
private HashMap<String, Server> mServerList = new HashMap<String, Server>();
public ServerFinder(Context aContext) {
mContext = aContext;
}
private void listenForServer() {
byte[] aBuffer = new byte[500];
DatagramPacket aPacket = new DatagramPacket(aBuffer, aBuffer.length);
try {
String aCommand = null;
String aName = null;
mSocket.receive(aPacket);
int i;
for (i = 0; i < aBuffer.length; i++) {
if (aPacket.getData()[i] == '\n') {
aCommand = new String(aPacket.getData(), 0, i, CHARSET);
break;
}
}
if (i == aBuffer.length || !aCommand.equals("LOREMOTE_ADVERTISE")) {
return;
}
for (int j = i + 1; j < aBuffer.length; j++) {
if (aPacket.getData()[j] == '\n') {
aName = new String(aPacket.getData(), i + 1, j - (i + 1),
CHARSET);
break;
}
}
if (aName == null) {
return;
}
Server aServer = new Server(Server.Protocol.NETWORK, aPacket
.getAddress().getHostAddress(), aName,
System.currentTimeMillis());
mServerList.put(aServer.getAddress(), aServer);
System.out.println("Contains:<<" + aName + ">>");
notifyActivity();
} catch (java.net.SocketTimeoutException e) {
// Ignore -- we want to timeout to enable checking whether we
// should stop listening periodically
} catch (IOException e) {
}
}
public void startFinding() {
if (mSocket != null)
return;
mFinishRequested = false;
if (mListenerThread == null) {
mListenerThread = new Thread() {
@Override
public void run() {
checkAndAddEmulator();
long aTime = 0;
try {
mSocket = new DatagramSocket();
mSocket.setSoTimeout(1000 * 10);
while (!mFinishRequested) {
if (System.currentTimeMillis() - aTime > SEARCH_INTERVAL) {
String aString = "LOREMOTE_SEARCH\n";
DatagramPacket aPacket = new DatagramPacket(
aString.getBytes(CHARSET),
aString.length(),
InetAddress.getByName(GROUPADDRESS),
PORT);
mSocket.send(aPacket);
aTime = System.currentTimeMillis();
// Remove stale servers
for (Server aServer : mServerList.values()) {
if (!aServer.mNoTimeout
&& System.currentTimeMillis()
- aServer.getTimeDiscovered() > 60 * 1000) {
mServerList.remove(aServer.getAddress());
notifyActivity();
}
}
}
listenForServer();
}
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
mListenerThread.start();
}
}
public void stopFinding() {
if (mListenerThread != null) {
mFinishRequested = true;
mListenerThread = null;
}
}
/**
* Check whether we are on an emulator and add it's host to the list of
* servers if so (although we do not know whether libo is running on
* the host).
*/
private void checkAndAddEmulator() {
try {
if (InetAddress.getByName("10.0.2.2").isReachable(100)) {
System.out.println("NulledNot");
Server aServer = new Server(Protocol.NETWORK, "10.0.2.2",
"Android Emulator Host", 0);
aServer.mNoTimeout = true;
mServerList.put(aServer.getAddress(), aServer);
notifyActivity();
}
} catch (IOException e) {
// Probably means we can't connect -- i.e. no emulator host
}
}
/**
* Notify the activity that the server list has changed.
*/
private void notifyActivity() {
Intent aIntent = new Intent(CommunicationService.MSG_SERVERLIST_CHANGED);
mContext.sendBroadcast(aIntent);
}
public Collection<Server> getServerList() {
return mServerList.values();
}
}
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