byte[] messageToBuffer(Message msg) throws Exception {
ObjectOutputStream out;
// BufferedOutputStream bos;
out_stream.reset();
// bos=new BufferedOutputStream(out_stream);
out_stream.write(Version.version_id, 0, Version.version_id.length); // write the version
// bos.write(Version.version_id, 0, Version.version_id.length); // write the version
out = new ObjectOutputStream(out_stream);
// out=new ObjectOutputStream(bos);
msg.writeExternal(out);
out.flush(); // needed if out buffers its output to out_stream
return out_stream.toByteArray();
}
/**
* Checks for the next item.
*
* @return result of check
* @throws IOException I/O exception
*/
public boolean more() throws IOException {
if (cache == null) {
out.write(4);
send(id);
cache = new ArrayList<byte[]>();
final ByteArrayOutputStream os = new ByteArrayOutputStream();
while (in.read() > 0) {
receive(in, os);
cache.add(os.toByteArray());
os.reset();
}
if (!ok()) throw new IOException(receive());
pos = 0;
}
if (pos < cache.size()) return true;
cache = null;
return false;
}
/** Method to keep the connection alive with the name server */
public void run() {
boolean connected = false;
int ticket = 0;
int serial = -1;
int time = 1000;
DatagramPacket inPack = new DatagramPacket(new byte[1024], 1024);
DatagramPacket outPack = new DatagramPacket(new byte[1024], 1024);
ByteArrayOutputStream outBuf = new ByteArrayOutputStream();
DataInputStream inData;
DataOutputStream outData = new DataOutputStream(outBuf);
while (running) {
if (!connected) { // Thoust ought Register thine self
try {
outBuf.reset();
outData.writeByte(0);
outData.writeUTF(userName);
outData.writeInt(portNum);
outData.flush();
outPack.setData(outBuf.toByteArray());
nameServer.send(outPack);
} catch (IOException e) {
System.err.println("LeetActive: " + e);
}
} else { // Thoust ought Renew thine self
try {
outBuf.reset();
outData.writeByte(2);
outData.writeInt(ticket);
outData.flush();
outPack.setData(outBuf.toByteArray());
nameServer.send(outPack);
} catch (IOException e) {
System.err.println(e);
}
}
// Now we will receive a packet...
try {
nameServer.receive(inPack);
inData = new DataInputStream(new ByteArrayInputStream(inPack.getData()));
byte type = inData.readByte();
if (type == 1) { // Twas a ticket packet
try {
ticket = inData.readInt();
if (ticket > -1) { // Make sure its not evil
connected = true;
} else {
connected = false;
}
time = inData.readInt();
} catch (IOException e) {
System.err.println(e);
}
}
if (type == 5) { // Twas an update packet
try {
int s = inData.readInt();
if (s > serial) { // Make sure its not old
serial = s;
int size = inData.readInt();
ArrayList newList = new ArrayList(size);
for (int x = 0; x < size; x++) {
newList.add(
new String(
"" + inData.readUTF() + "@" + inData.readUTF() + ":" + inData.readInt()));
}
if (!newList.equals(hostList)) {
hostList = newList;
updated = true;
}
}
} catch (IOException e) {
System.err.println(e);
}
}
} catch (SocketTimeoutException e) { // Server hates you
connected = false;
System.err.println(e);
} catch (IOException e) {
System.err.println(e);
}
try { // Take a nap
sleep(time / 4);
} catch (InterruptedException e) {
}
}
}