@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;
}
/** Executed when the I/O has completed */
@Override
@SuppressWarnings("unchecked")
public void completed(int bytesTransferred, boolean canInvokeDirect) {
if (bytesTransferred == 0) {
bytesTransferred = -1; // EOF
} else {
updateBuffers(bytesTransferred);
}
// return direct buffer to cache if substituted
releaseBuffers();
// release waiters if not already released by timeout
synchronized (result) {
if (result.isDone()) return;
enableReading();
if (scatteringRead) {
result.setResult((V) Long.valueOf(bytesTransferred));
} else {
result.setResult((V) Integer.valueOf(bytesTransferred));
}
}
if (canInvokeDirect) {
Invoker.invokeUnchecked(result);
} else {
Invoker.invoke(result);
}
}
/** Invoked by handler thread when connection established. */
@Override
public void completed(int bytesTransferred, boolean canInvokeDirect) {
Throwable exc = null;
try {
begin();
afterConnect();
result.setResult(null);
} catch (Throwable x) {
// channel is closed or unable to finish connect
exc = x;
} finally {
end();
}
// can't close channel while in begin/end block
if (exc != null) {
closeChannel();
result.setFailure(toIOException(exc));
}
if (canInvokeDirect) {
Invoker.invokeUnchecked(result);
} else {
Invoker.invoke(result);
}
}
/** Invoked by handler thread when failed to establish connection. */
@Override
public void failed(int error, IOException x) {
if (isOpen()) {
closeChannel();
result.setFailure(x);
} else {
result.setFailure(new AsynchronousCloseException());
}
Invoker.invoke(result);
}
@Override
@SuppressWarnings("unchecked")
public void run() {
long overlapped = 0L;
boolean prepared = false;
boolean pending = false;
try {
begin();
// substitute non-direct buffers
prepareBuffers();
prepared = true;
// get an OVERLAPPED structure (from the cache or allocate)
overlapped = ioCache.add(result);
// initiate read
int n = read0(handle, numBufs, readBufferArray, overlapped);
if (n == IOStatus.UNAVAILABLE) {
// I/O is pending
pending = true;
return;
}
if (n == IOStatus.EOF) {
// input shutdown
enableReading();
if (scatteringRead) {
result.setResult((V) Long.valueOf(-1L));
} else {
result.setResult((V) Integer.valueOf(-1));
}
} else {
throw new InternalError("Read completed immediately");
}
} catch (Throwable x) {
// failed to initiate read
// reset read flag before releasing waiters
enableReading();
if (x instanceof ClosedChannelException) x = new AsynchronousCloseException();
if (!(x instanceof IOException)) x = new IOException(x);
result.setFailure(x);
} finally {
// release resources if I/O not pending
if (!pending) {
if (overlapped != 0L) ioCache.remove(overlapped);
if (prepared) releaseBuffers();
}
end();
}
// invoke completion handler
Invoker.invoke(result);
}
/** Invoked if timeout expires before it is cancelled */
void timeout() {
// synchronize on result as the I/O could complete/fail
synchronized (result) {
if (result.isDone()) return;
// kill further writing before releasing waiters
enableWriting(true);
result.setFailure(new InterruptedByTimeoutException());
}
// invoke handler without any locks
Invoker.invoke(result);
}
@Override
// @SuppressWarnings("unchecked")
public void run() {
long overlapped = 0L;
boolean prepared = false;
boolean pending = false;
boolean shutdown = false;
try {
begin();
// substitute non-direct buffers
prepareBuffers();
prepared = true;
// get an OVERLAPPED structure (from the cache or allocate)
overlapped = ioCache.add(result);
int n = write0(handle, numBufs, writeBufferArray, overlapped);
if (n == IOStatus.UNAVAILABLE) {
// I/O is pending
pending = true;
return;
}
if (n == IOStatus.EOF) {
// special case for shutdown output
shutdown = true;
throw new ClosedChannelException();
}
// write completed immediately
throw new InternalError("Write completed immediately");
} catch (Throwable x) {
// write failed. Enable writing before releasing waiters.
enableWriting();
if (!shutdown && (x instanceof ClosedChannelException))
x = new AsynchronousCloseException();
if (!(x instanceof IOException)) x = new IOException(x);
result.setFailure(x);
} finally {
// release resources if I/O not pending
if (!pending) {
if (overlapped != 0L) ioCache.remove(overlapped);
if (prepared) releaseBuffers();
}
end();
}
// invoke completion handler
Invoker.invoke(result);
}
@Override
public void failed(int error, IOException x) {
// return direct buffer to cache if substituted
releaseBuffers();
// release waiters if not already released by timeout
if (!isOpen()) x = new AsynchronousCloseException();
synchronized (result) {
if (result.isDone()) return;
enableWriting();
result.setFailure(x);
}
Invoker.invoke(result);
}
/** Task to initiate a connection. */
@Override
public void run() {
long overlapped = 0L;
Throwable exc = null;
try {
begin();
// synchronize on result to allow this thread handle the case
// where the connection is established immediately.
synchronized (result) {
overlapped = ioCache.add(result);
// initiate the connection
int n =
connect0(
handle, Net.isIPv6Available(), remote.getAddress(), remote.getPort(), overlapped);
if (n == IOStatus.UNAVAILABLE) {
// connection is pending
return;
}
// connection established immediately
afterConnect();
result.setResult(null);
}
} catch (Throwable x) {
if (overlapped != 0L) ioCache.remove(overlapped);
exc = x;
} finally {
end();
}
if (exc != null) {
closeChannel();
result.setFailure(toIOException(exc));
}
Invoker.invoke(result);
}