/** Attach to the specified address with optional attach and handshake timeout. */
public Connection attach(String address, long attachTimeout, long handshakeTimeout)
throws IOException {
if (address == null) {
throw new NullPointerException("address is null");
}
if (attachTimeout < 0 || handshakeTimeout < 0) {
throw new IllegalArgumentException("timeout is negative");
}
int splitIndex = address.indexOf(':');
String host;
String portStr;
if (splitIndex < 0) {
host = InetAddress.getLocalHost().getHostName();
portStr = address;
} else {
host = address.substring(0, splitIndex);
portStr = address.substring(splitIndex + 1);
}
int port;
try {
port = Integer.decode(portStr).intValue();
} catch (NumberFormatException e) {
throw new IllegalArgumentException("unable to parse port number in address");
}
// open TCP connection to VM
InetSocketAddress sa = new InetSocketAddress(host, port);
Socket s = new Socket();
try {
s.connect(sa, (int) attachTimeout);
} catch (SocketTimeoutException exc) {
try {
s.close();
} catch (IOException x) {
}
throw new TransportTimeoutException("timed out trying to establish connection");
}
// handshake with the target VM
try {
handshake(s, handshakeTimeout);
} catch (IOException exc) {
try {
s.close();
} catch (IOException x) {
}
throw exc;
}
return new SocketConnection(s);
}
/*
* Returns the string representation of the address that this
* listen key represents.
*/
public String address() {
InetAddress address = ss.getInetAddress();
/*
* If bound to the wildcard address then use current local
* hostname. In the event that we don't know our own hostname
* then assume that host supports IPv4 and return something to
* represent the loopback address.
*/
if (address.isAnyLocalAddress()) {
try {
address = InetAddress.getLocalHost();
} catch (UnknownHostException uhe) {
byte[] loopback = {0x7f, 0x00, 0x00, 0x01};
try {
address = InetAddress.getByAddress("127.0.0.1", loopback);
} catch (UnknownHostException x) {
throw new InternalError("unable to get local hostname");
}
}
}
/*
* Now decide if we return a hostname or IP address. Where possible
* return a hostname but in the case that we are bound to an
* address that isn't registered in the name service then we
* return an address.
*/
String result;
String hostname = address.getHostName();
String hostaddr = address.getHostAddress();
if (hostname.equals(hostaddr)) {
if (address instanceof Inet6Address) {
result = "[" + hostaddr + "]";
} else {
result = hostaddr;
}
} else {
result = hostname;
}
/*
* Finally return "hostname:port", "ipv4-address:port" or
* "[ipv6-address]:port".
*/
return result + ":" + ss.getLocalPort();
}
