@Override
public DatagramChannel bind(SocketAddress local) throws IOException {
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpen();
if (localAddress != null) throw new AlreadyBoundException();
InetSocketAddress isa;
if (local == null) {
// only Inet4Address allowed with IPv4 socket
if (family == StandardProtocolFamily.INET) {
isa = new InetSocketAddress(InetAddress.getByName("0.0.0.0"), 0);
} else {
isa = new InetSocketAddress(0);
}
} else {
isa = Net.checkAddress(local);
// only Inet4Address allowed with IPv4 socket
if (family == StandardProtocolFamily.INET) {
InetAddress addr = isa.getAddress();
if (!(addr instanceof Inet4Address)) throw new UnsupportedAddressTypeException();
}
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkListen(isa.getPort());
}
Net.bind(family, fd, isa.getAddress(), isa.getPort());
localAddress = Net.localAddress(fd);
}
}
}
return this;
}
public DatagramChannel connect(SocketAddress sa) throws IOException {
int localPort = 0;
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpenAndUnconnected();
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
int n = Net.connect(family, fd, isa.getAddress(), isa.getPort());
if (n <= 0) throw new Error(); // Can't happen
// Connection succeeded; disallow further invocation
state = ST_CONNECTED;
remoteAddress = sa;
sender = isa;
cachedSenderInetAddress = isa.getAddress();
cachedSenderPort = isa.getPort();
// set or refresh local address
localAddress = Net.localAddress(fd);
}
}
}
return this;
}
public int send(ByteBuffer src, SocketAddress target) throws IOException {
if (src == null) throw new NullPointerException();
synchronized (writeLock) {
ensureOpen();
InetSocketAddress isa = Net.checkAddress(target);
InetAddress ia = isa.getAddress();
if (ia == null) throw new IOException("Target address not resolved");
synchronized (stateLock) {
if (!isConnected()) {
if (target == null) throw new NullPointerException();
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
if (ia.isMulticastAddress()) {
sm.checkMulticast(ia);
} else {
sm.checkConnect(ia.getHostAddress(), isa.getPort());
}
}
} else { // Connected case; Check address then write
if (!target.equals(remoteAddress)) {
throw new IllegalArgumentException("Connected address not equal to target address");
}
return write(src);
}
}
int n = 0;
try {
begin();
if (!isOpen()) return 0;
writerThread = NativeThread.current();
do {
n = send(fd, src, isa);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
synchronized (stateLock) {
if (isOpen() && (localAddress == null)) {
localAddress = Net.localAddress(fd);
}
}
return IOStatus.normalize(n);
} finally {
writerThread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
@Override
public DatagramChannel connect(SocketAddress sa) throws IOException {
int localPort = 0;
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
ensureOpenAndUnconnected();
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
int n = Net.connect(family, fd, isa.getAddress(), isa.getPort());
if (n <= 0) throw new Error(); // Can't happen
// Connection succeeded; disallow further invocation
state = ST_CONNECTED;
remoteAddress = isa;
sender = isa;
cachedSenderInetAddress = isa.getAddress();
cachedSenderPort = isa.getPort();
// set or refresh local address
localAddress = Net.localAddress(fd);
// flush any packets already received.
boolean blocking = false;
synchronized (blockingLock()) {
try {
blocking = isBlocking();
// remainder of each packet thrown away
ByteBuffer tmpBuf = ByteBuffer.allocate(1);
if (blocking) {
configureBlocking(false);
}
do {
tmpBuf.clear();
} while (receive(tmpBuf) != null);
} finally {
if (blocking) {
configureBlocking(true);
}
}
}
}
}
}
return this;
}