// Runnable IMPLEMENTATION /////////////////////////////////////////////////
public void run() {
if (thread != null)
throw new IllegalStateException(
"This instance of "
+ getClass().getSimpleName()
+ " can only be started once the same time.");
thread = Thread.currentThread();
try {
server = ServerSocketChannel.open();
server.configureBlocking(false);
server.socket().bind(address);
// InetAddress.getLocalHost()
selector = Selector.open();
server.register(selector, server.validOps());
} catch (IOException ex) {
onWebsocketError(null, ex);
return;
}
while (!thread.isInterrupted()) {
SelectionKey key = null;
WebSocket conn = null;
try {
selector.select();
Set<SelectionKey> keys = selector.selectedKeys();
Iterator<SelectionKey> i = keys.iterator();
while (i.hasNext()) {
key = i.next();
// Remove the current key
i.remove();
// if isAcceptable == true
// then a client required a connection
if (key.isAcceptable()) {
SocketChannel client = server.accept();
client.configureBlocking(false);
WebSocket c = new WebSocket(this, Collections.singletonList(draft), client);
client.register(selector, SelectionKey.OP_READ, c);
}
// if isReadable == true
// then the server is ready to read
if (key.isReadable()) {
conn = (WebSocket) key.attachment();
conn.handleRead();
}
// if isWritable == true
// then we need to send the rest of the data to the client
if (key.isValid() && key.isWritable()) {
conn = (WebSocket) key.attachment();
conn.flush();
key.channel().register(selector, SelectionKey.OP_READ, conn);
}
}
Iterator<WebSocket> it = this.connections.iterator();
while (it.hasNext()) {
// We have to do this check here, and not in the thread that
// adds the buffered data to the WebSocket, because the
// Selector is not thread-safe, and can only be accessed
// by this thread.
conn = it.next();
if (conn.hasBufferedData()) {
conn.flush();
// key.channel().register( selector, SelectionKey.OP_READ | SelectionKey.OP_WRITE, conn
// );
}
}
} catch (IOException ex) {
if (key != null) key.cancel();
onWebsocketError(conn, ex); // conn may be null here
if (conn != null) {
conn.close(CloseFrame.ABNROMAL_CLOSE);
}
}
}
}
