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 boolean connect(SocketAddress sa) throws IOException {
int trafficClass = 0; // ## Pick up from options
int localPort = 0;
synchronized (readLock) {
synchronized (writeLock) {
ensureOpenAndUnconnected();
InetSocketAddress isa = Net.checkAddress(sa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
synchronized (blockingLock()) {
int n = 0;
try {
try {
begin();
synchronized (stateLock) {
if (!isOpen()) {
return false;
}
readerThread = NativeThread.current();
}
for (; ; ) {
InetAddress ia = isa.getAddress();
if (ia.isAnyLocalAddress()) ia = InetAddress.getLocalHost();
n = connectImpl(ia, isa.getPort(), trafficClass);
if ((n == IOStatus.INTERRUPTED) && isOpen()) continue;
break;
}
} finally {
readerCleanup();
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
} catch (IOException x) {
// If an exception was thrown, close the channel after
// invoking end() so as to avoid bogus
// AsynchronousCloseExceptions
close();
throw x;
}
synchronized (stateLock) {
remoteAddress = isa;
if (n > 0) {
// Connection succeeded; disallow further
// invocation
state = ST_CONNECTED;
return true;
}
// If nonblocking and no exception then connection
// pending; disallow another invocation
if (!isBlocking()) state = ST_PENDING;
else assert false;
}
}
return false;
}
}
}
@Override
<A> Future<Void> implConnect(
SocketAddress remote, A attachment, CompletionHandler<Void, ? super A> handler) {
if (!isOpen()) {
Throwable exc = new ClosedChannelException();
if (handler == null) return CompletedFuture.withFailure(exc);
Invoker.invoke(this, handler, attachment, null, exc);
return null;
}
InetSocketAddress isa = Net.checkAddress(remote);
// permission check
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
// check and update state
// ConnectEx requires the socket to be bound to a local address
IOException bindException = null;
synchronized (stateLock) {
if (state == ST_CONNECTED) throw new AlreadyConnectedException();
if (state == ST_PENDING) throw new ConnectionPendingException();
if (localAddress == null) {
try {
bind(new InetSocketAddress(0));
} catch (IOException x) {
bindException = x;
}
}
if (bindException == null) state = ST_PENDING;
}
// handle bind failure
if (bindException != null) {
try {
close();
} catch (IOException ignore) {
}
if (handler == null) return CompletedFuture.withFailure(bindException);
Invoker.invoke(this, handler, attachment, null, bindException);
return null;
}
// setup task
PendingFuture<Void, A> result = new PendingFuture<Void, A>(this, handler, attachment);
ConnectTask task = new ConnectTask<A>(isa, result);
result.setContext(task);
// initiate I/O
if (Iocp.supportsThreadAgnosticIo()) {
task.run();
} else {
Invoker.invokeOnThreadInThreadPool(this, task);
}
return result;
}
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;
}
public DatagramChannel disconnect() throws IOException {
synchronized (readLock) {
synchronized (writeLock) {
synchronized (stateLock) {
if (!isConnected() || !isOpen()) return this;
InetSocketAddress isa = (InetSocketAddress) remoteAddress;
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkConnect(isa.getAddress().getHostAddress(), isa.getPort());
disconnect0(fd);
remoteAddress = null;
state = ST_UNCONNECTED;
// refresh local address
localAddress = Net.localAddress(fd);
}
}
}
return this;
}