public void handleUpdatePacket(Packet p, String from) {
// dont update packets that came from this device
if (p.getSource().equals(localDevice.getBluetoothAddress())) return;
// get the md5 of the payload of the packet and store it
// if the previous md5 is the same with the new one
// then this packet is redundant
String hash = md5(p.getPayload());
if (history.containsKey(p.getSource())) {
String old = history.get(p.getSource());
if (old.equals(hash)) return;
}
ByteBuffer buffer = ByteBuffer.allocate(p.getPayload().length);
buffer.put(p.getPayload());
routingTable.remove(p.getSource());
routingTable.add(p.getSource());
byte[] tmp = new byte[12];
while (buffer.hasRemaining()) {
buffer.get(tmp, 0, 12);
routingTable.add(p.getSource(), new String(tmp));
}
for (String address : connections.keySet()) {
if (!address.equals(from)) {
connections.get(address).offer(p);
}
}
history.put(p.getSource(), hash);
}
public void handlePacket(byte[] p, String from) {
Packet s = Packet.createPacket(p);
s.decreaseHopCount();
if (s.getHopCount() > 0) {
Log("SynCore", s.getSource() + " " + s.getDestination());
if (s.getType() == Packet.DATA_PACKET) {
handleDataPacket(s);
} else {
handleUpdatePacket(s, from);
}
}
}
public void handleDataPacket(Packet p) {
// this packet is for this device
if (p.getDestination().equals(localDevice.getBluetoothAddress())) {
offer(p);
} else {
String nextHop = routingTable.nextHop(localDevice.getBluetoothAddress(), p.getDestination());
if (nextHop != null) {
Log("SynCore", "Packet from: " + p.getSource() + " routed to: " + nextHop);
for (String n : connections.keySet()) {
if (n.equals(nextHop)) {
connections.get(n).offer(p);
}
}
}
}
}