/**
* The MIT License
* Copyright (c) 2014-2016 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.reactor.app;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import com.iluwatar.reactor.framework.AbstractNioChannel;
import com.iluwatar.reactor.framework.ChannelHandler;
import com.iluwatar.reactor.framework.NioDatagramChannel.DatagramPacket;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Logging server application logic. It logs the incoming requests on standard console and returns a
* canned acknowledgement back to the remote peer.
*/
public class LoggingHandler implements ChannelHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(LoggingHandler.class);
private static final byte[] ACK = "Data logged successfully".getBytes();
/**
* Decodes the received data and logs it on standard console.
*/
@Override
public void handleChannelRead(AbstractNioChannel channel, Object readObject, SelectionKey key) {
/*
* As this handler is attached with both TCP and UDP channels we need to check whether the data
* received is a ByteBuffer (from TCP channel) or a DatagramPacket (from UDP channel).
*/
if (readObject instanceof ByteBuffer) {
doLogging((ByteBuffer) readObject);
sendReply(channel, key);
} else if (readObject instanceof DatagramPacket) {
DatagramPacket datagram = (DatagramPacket) readObject;
doLogging(datagram.getData());
sendReply(channel, datagram, key);
} else {
throw new IllegalStateException("Unknown data received");
}
}
private static void sendReply(AbstractNioChannel channel, DatagramPacket incomingPacket, SelectionKey key) {
/*
* Create a reply acknowledgement datagram packet setting the receiver to the sender of incoming
* message.
*/
DatagramPacket replyPacket = new DatagramPacket(ByteBuffer.wrap(ACK));
replyPacket.setReceiver(incomingPacket.getSender());
channel.write(replyPacket, key);
}
private static void sendReply(AbstractNioChannel channel, SelectionKey key) {
ByteBuffer buffer = ByteBuffer.wrap(ACK);
channel.write(buffer, key);
}
private static void doLogging(ByteBuffer data) {
// assuming UTF-8 :(
LOGGER.info(new String(data.array(), 0, data.limit()));
}
}