WindowsAsynchronousSocketChannelImpl(Iocp iocp, boolean failIfGroupShutdown) throws IOException {
super(iocp);
// associate socket with default completion port
long h = IOUtil.fdVal(fd);
int key = 0;
try {
key = iocp.associate(this, h);
} catch (ShutdownChannelGroupException x) {
if (failIfGroupShutdown) {
closesocket0(h);
throw x;
}
} catch (IOException x) {
closesocket0(h);
throw x;
}
this.handle = h;
this.iocp = iocp;
this.completionKey = key;
this.ioCache = new PendingIoCache();
// allocate WSABUF arrays
this.readBufferArray = unsafe.allocateMemory(SIZEOF_WSABUFARRAY);
this.writeBufferArray = unsafe.allocateMemory(SIZEOF_WSABUFARRAY);
}
@Override
<V extends Number, A> Future<V> implWrite(
boolean gatheringWrite,
ByteBuffer src,
ByteBuffer[] srcs,
long timeout,
TimeUnit unit,
A attachment,
CompletionHandler<V, ? super A> handler) {
// setup task
PendingFuture<V, A> result = new PendingFuture<V, A>(this, handler, attachment);
ByteBuffer[] bufs;
if (gatheringWrite) {
bufs = srcs;
} else {
bufs = new ByteBuffer[1];
bufs[0] = src;
}
final WriteTask writeTask = new WriteTask<V, A>(bufs, gatheringWrite, result);
result.setContext(writeTask);
// schedule timeout
if (timeout > 0L) {
Future<?> timeoutTask =
iocp.schedule(
new Runnable() {
public void run() {
writeTask.timeout();
}
},
timeout,
unit);
result.setTimeoutTask(timeoutTask);
}
// initiate I/O (can only be done from thread in thread pool)
// initiate I/O
if (Iocp.supportsThreadAgnosticIo()) {
writeTask.run();
} else {
Invoker.invokeOnThreadInThreadPool(this, writeTask);
}
return result;
}
@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;
}
@Override
<V extends Number, A> Future<V> implRead(
boolean isScatteringRead,
ByteBuffer dst,
ByteBuffer[] dsts,
long timeout,
TimeUnit unit,
A attachment,
CompletionHandler<V, ? super A> handler) {
// setup task
PendingFuture<V, A> result = new PendingFuture<V, A>(this, handler, attachment);
ByteBuffer[] bufs;
if (isScatteringRead) {
bufs = dsts;
} else {
bufs = new ByteBuffer[1];
bufs[0] = dst;
}
final ReadTask readTask = new ReadTask<V, A>(bufs, isScatteringRead, result);
result.setContext(readTask);
// schedule timeout
if (timeout > 0L) {
Future<?> timeoutTask =
iocp.schedule(
new Runnable() {
public void run() {
readTask.timeout();
}
},
timeout,
unit);
result.setTimeoutTask(timeoutTask);
}
// initiate I/O
if (Iocp.supportsThreadAgnosticIo()) {
readTask.run();
} else {
Invoker.invokeOnThreadInThreadPool(this, readTask);
}
return result;
}
@Override
void implClose() throws IOException {
// close socket (may cause outstanding async I/O operations to fail).
closesocket0(handle);
// waits until all I/O operations have completed
ioCache.close();
// release arrays of WSABUF structures
unsafe.freeMemory(readBufferArray);
unsafe.freeMemory(writeBufferArray);
// finally disassociate from the completion port (key can be 0 if
// channel created when group is shutdown)
if (completionKey != 0) iocp.disassociate(completionKey);
}
