private void processKey(SelectionKey key) {
try {
if (key.isReadable()) {
final DatagramChannel socketChannel = (DatagramChannel) key.channel();
reader.readAll(socketChannel);
}
if (key.isWritable()) {
final DatagramChannel socketChannel = (DatagramChannel) key.channel();
try {
int bytesJustWritten = writer.writeAll(socketChannel);
contemplateThrottleWrites(bytesJustWritten);
} catch (NotYetConnectedException e) {
if (LOG.isDebugEnabled()) LOG.debug("", e);
serverConnector.connectLater();
} catch (IOException e) {
if (LOG.isDebugEnabled()) LOG.debug("", e);
serverConnector.connectLater();
}
}
} catch (Exception e) {
LOG.error("", e);
if (!isClosed) closeEarlyAndQuietly(key.channel());
}
}
/** binds to the server socket and process data This method will block until interrupted */
@Override
void processEvent() throws IOException {
try {
connectClient().register(selector, OP_READ);
serverConnector.connectLater();
while (selector.isOpen()) {
registerPendingRegistrations();
// this may block for a long time, upon return the
// selected set contains keys of the ready channels
final int n = selector.select(100);
if (shouldEnableOpWrite) enableWrites();
checkThrottleInterval();
if (n == 0) {
continue; // nothing to do
}
if (useJavaNIOSelectionKeys) {
// use the standard java nio selector
final Set<SelectionKey> selectionKeys = selector.selectedKeys();
for (final SelectionKey key : selectionKeys) {
processKey(key);
}
selectionKeys.clear();
} else {
// use the netty like selector
final SelectionKey[] keys = selectedKeys.flip();
try {
for (int i = 0; i < keys.length && keys[i] != null; i++) {
final SelectionKey key = keys[i];
try {
processKey(key);
} catch (BufferUnderflowException e) {
if (!isClosed) LOG.error("", e);
}
}
} finally {
for (int i = 0; i < keys.length && keys[i] != null; i++) {
keys[i] = null;
}
}
}
}
} catch (CancelledKeyException
| ConnectException
| ClosedChannelException
| ClosedSelectorException e) {
if (LOG.isDebugEnabled()) LOG.debug("", e);
} catch (Exception e) {
LOG.error("", e);
} catch (Throwable e) {
LOG.error("", e);
throw e;
} finally {
if (LOG.isDebugEnabled()) LOG.debug("closing name=" + this.name);
if (!isClosed) {
closeResources();
}
}
}