/**
* Open channels for each listen address and register them against this ConnectionHandler's {@link
* Selector}.
*
* @return the number of successfully registered channel
*/
private int registerChannels() {
int numRegistered = 0;
for (InetAddress a : listenAddresses) {
try {
ServerSocketChannel channel = ServerSocketChannel.open();
channel.socket().setReuseAddress(allowReuseAddress);
channel.socket().bind(new InetSocketAddress(a, listenPort), backlog);
channel.configureBlocking(false);
channel.register(selector, SelectionKey.OP_ACCEPT);
numRegistered++;
logger.info(NOTE_CONNHANDLER_STARTED_LISTENING, handlerName);
} catch (Exception e) {
logger.traceException(e);
logger.error(
ERR_LDAP_CONNHANDLER_CREATE_CHANNEL_FAILED,
currentConfig.dn(),
a.getHostAddress(),
listenPort,
stackTraceToSingleLineString(e));
}
}
return numRegistered;
}
/**
* Serves the incoming connections.
*
* @throws IOException
* @throws DirectoryException
*/
private void serveIncomingConnections() throws IOException, DirectoryException {
int selectorState = selector.select();
// We can't rely on return value of select to determine if any keys
// are ready.
// see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4850373
for (Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
iterator.hasNext(); ) {
SelectionKey key = iterator.next();
iterator.remove();
if (key.isAcceptable()) {
// Accept the new client connection.
ServerSocketChannel serverChannel = (ServerSocketChannel) key.channel();
SocketChannel clientChannel = serverChannel.accept();
if (clientChannel != null) {
acceptConnection(clientChannel);
}
}
if (selectorState == 0 && enabled && !shutdownRequested && logger.isTraceEnabled()) {
// Selected keys was non empty but select() returned 0.
// Log warning and hope it blocks on the next select() call.
logger.trace(
"Selector.select() returned 0. "
+ "Selected Keys: %d, Interest Ops: %d, Ready Ops: %d ",
selector.selectedKeys().size(), key.interestOps(), key.readyOps());
}
}
}