Estoy usando this tutorial para construir un servidor java nio sin la sección de escritura.Servidor asíncrono con Java NIO
Todo funciona bien, excepto por una cosa interesante:
- Cuando el cliente está enviando paquetes demasiado rápido, el servidor no recibe todos los mensajes, el servidor está consiguiendo siempre el primero y el segundo paquetes, pero no más que eso.
- Si el cliente envía los paquetes lentamente, el servidor obtiene todos los paquetes.
¿Alguna idea?
Estoy agregando el código de clase del servidor, si necesita otra clase que se menciona en el código a continuación, estoy aquí :).
clase NIOServer:
package server;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.SelectorProvider;
import java.util.*;
import javax.xml.parsers.ParserConfigurationException;
import org.xml.sax.SAXException;
public class NioServer implements Runnable {
// The host:port combination to listen on
private InetAddress hostAddress;
private int port;
// The channel on which we'll accept connections
private ServerSocketChannel serverChannel;
// The selector we'll be monitoring
private Selector selector;
//the cach will hundle the messages that came
private Cache cache;
// The buffer into which we'll read data when it's available
private ByteBuffer readBuffer = ByteBuffer.allocate(8192);
public NioServer(InetAddress hostAddress, int port , Cache cache) throws IOException {
this.cache = cache;
this.hostAddress = hostAddress;
this.port = port;
this.selector = this.initSelector();
}
private Selector initSelector() throws IOException {
// Create a new selector
Selector socketSelector = SelectorProvider.provider().openSelector();
// Create a new non-blocking server socket channel
this.serverChannel = ServerSocketChannel.open();
serverChannel.configureBlocking(false);
// Bind the server socket to the specified address and port
InetSocketAddress isa = new InetSocketAddress(this.hostAddress, this.port);
serverChannel.socket().bind(isa);
// Register the server socket channel, indicating an interest in
// accepting new connections
serverChannel.register(socketSelector, SelectionKey.OP_ACCEPT);
return socketSelector;
}
private void accept(SelectionKey key) throws IOException {
// For an accept to be pending the channel must be a server socket channel.
ServerSocketChannel serverSocketChannel = (ServerSocketChannel) key.channel();
// Accept the connection and make it non-blocking
SocketChannel socketChannel = serverSocketChannel.accept();
Socket socket = socketChannel.socket();
socketChannel.configureBlocking(false);
// Register the new SocketChannel with our Selector, indicating
// we'd like to be notified when there's data waiting to be read
socketChannel.register(this.selector, SelectionKey.OP_READ);
}
private void read(SelectionKey key) throws IOException {
SocketChannel socketChannel = (SocketChannel) key.channel();
// Clear out our read buffer so it's ready for new data
this.readBuffer.clear();
// Attempt to read off the channel
int numRead;
try {
numRead = socketChannel.read(this.readBuffer);
String test = new String(this.readBuffer.array());
System.out.print(test);
} catch (IOException e) {
// The remote forcibly closed the connection, cancel
// the selection key and close the channel.
// key.cancel();
// socketChannel.close();
return;
}
if (numRead == -1) {
// Remote entity shut the socket down cleanly. Do the
// same from our end and cancel the channel.
key.channel().close();
key.cancel();
return;
}
// Hand the data off to our worker thread
this.cache.processData(this, socketChannel, this.readBuffer.array(), numRead);
}
public void run() {
while (true) {
try {
// Wait for an event one of the registered channels
this.selector.select();
// Iterate over the set of keys for which events are available
Iterator selectedKeys = this.selector.selectedKeys().iterator();
while (selectedKeys.hasNext()) {
SelectionKey key = (SelectionKey) selectedKeys.next();
selectedKeys.remove();
if (!key.isValid()) {
continue;
}
// Check what event is available and deal with it
if (key.isAcceptable()) {
this.accept(key);
} else if (key.isReadable()) {
this.read(key);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) throws ParserConfigurationException, SAXException {
try {
Cache cache = new Cache();
new Thread(cache).start();
new Thread(new NioServer(null, 9090,cache)).start();
} catch (IOException e) {
e.printStackTrace();
}
}
Debe haber un error en su código. Si quieres más ayuda, danos más información. –
No tengo el código ahora, lo tendré el domingo. Gracias –
TCP no pierde datos y tampoco lo hace NIO. No está leyendo todos los datos o tirando algunos de ellos. Sin algún código para comentar es imposible hacer más comentarios. – EJP