public static boolean isPortAvailable(int port) {
boolean available = true;
int available_code = mOpenPorts.get(port);
if (available_code != 0) return available_code != 1;
try {
// attempt 3 times since proxy and server could be still releasing
// their ports
for (int i = 0; i < 3; i++) {
Socket channel = new Socket();
InetSocketAddress address =
new InetSocketAddress(InetAddress.getByName(mNetwork.getLocalAddressAsString()), port);
channel.connect(address, 200);
available = !channel.isConnected();
channel.close();
if (available) break;
Thread.sleep(200);
}
} catch (Exception e) {
available = true;
}
mOpenPorts.put(port, available ? 2 : 1);
return available;
}
