/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.mina.core.nio.udp;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.HashMap;
import java.util.Map;
import org.apache.mina.core.BenchmarkServer;
import org.apache.mina.core.CounterFilter;
import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.ChildChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
import org.jboss.netty.channel.WriteCompletionEvent;
import org.jboss.netty.channel.group.ChannelGroup;
import org.jboss.netty.channel.group.DefaultChannelGroup;
import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;
/**
* A Netty 3 based UDP server
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*/
public class Netty3UdpBenchmarkServer implements BenchmarkServer {
private static enum State {
WAIT_FOR_FIRST_BYTE_LENGTH, WAIT_FOR_SECOND_BYTE_LENGTH, WAIT_FOR_THIRD_BYTE_LENGTH, WAIT_FOR_FOURTH_BYTE_LENGTH, READING
}
private static final ChannelBuffer ACK = ChannelBuffers.buffer(1);
static {
ACK.writeByte(0);
}
private static final String STATE_ATTRIBUTE = Netty3UdpBenchmarkServer.class.getName() + ".state";
private static final String LENGTH_ATTRIBUTE = Netty3UdpBenchmarkServer.class.getName() + ".length";
private ChannelFactory factory;
private ChannelGroup allChannels = new DefaultChannelGroup();
/**
* Allocate a map as attachment for storing attributes.
*
* @param ctx the channel context
* @return the map from the attachment
*/
protected static Map<String, Object> getAttributesMap(ChannelHandlerContext ctx) {
Map<String, Object> map = (Map<String, Object>) ctx.getAttachment();
if (map == null) {
map = new HashMap<String, Object>();
ctx.setAttachment(map);
}
return map;
}
private static void setAttribute(ChannelHandlerContext ctx, String name, Object value) {
getAttributesMap(ctx).put(name, value);
}
private static Object getAttribute(ChannelHandlerContext ctx, String name) {
return getAttributesMap(ctx).get(name);
}
/**
* {@inheritDoc}
*/
public void start(int port) throws IOException {
factory = new NioDatagramChannelFactory();
ConnectionlessBootstrap bootstrap = new ConnectionlessBootstrap(factory);
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(new SimpleChannelUpstreamHandler() {
@Override
public void childChannelOpen(ChannelHandlerContext ctx, ChildChannelStateEvent e) throws Exception {
System.out.println("childChannelOpen");
setAttribute(ctx, STATE_ATTRIBUTE, State.WAIT_FOR_FIRST_BYTE_LENGTH);
}
@Override
public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
System.out.println("channelOpen");
setAttribute(ctx, STATE_ATTRIBUTE, State.WAIT_FOR_FIRST_BYTE_LENGTH);
allChannels.add(ctx.getChannel());
}
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
if (e.getMessage() instanceof ChannelBuffer) {
ChannelBuffer buffer = (ChannelBuffer) e.getMessage();
State state = (State) getAttribute(ctx, STATE_ATTRIBUTE);
int length = 0;
if (getAttributesMap(ctx).containsKey(LENGTH_ATTRIBUTE)) {
length = (Integer) getAttribute(ctx, LENGTH_ATTRIBUTE);
}
while (buffer.readableBytes() > 0) {
switch (state) {
case WAIT_FOR_FIRST_BYTE_LENGTH:
length = (buffer.readByte() & 255) << 24;
state = State.WAIT_FOR_SECOND_BYTE_LENGTH;
break;
case WAIT_FOR_SECOND_BYTE_LENGTH:
length += (buffer.readByte() & 255) << 16;
state = State.WAIT_FOR_THIRD_BYTE_LENGTH;
break;
case WAIT_FOR_THIRD_BYTE_LENGTH:
length += (buffer.readByte() & 255) << 8;
state = State.WAIT_FOR_FOURTH_BYTE_LENGTH;
break;
case WAIT_FOR_FOURTH_BYTE_LENGTH:
length += (buffer.readByte() & 255);
state = State.READING;
if ((length == 0) && (buffer.readableBytes() == 0)) {
ctx.getChannel().write(ACK.slice());
state = State.WAIT_FOR_FIRST_BYTE_LENGTH;
}
break;
case READING:
int remaining = buffer.readableBytes();
if (length > remaining) {
length -= remaining;
buffer.skipBytes(remaining);
} else {
buffer.skipBytes(length);
SocketAddress remoteAddress = e.getRemoteAddress();
ctx.getChannel().write(ACK.slice(), remoteAddress);
state = State.WAIT_FOR_FIRST_BYTE_LENGTH;
length = 0;
}
}
}
setAttribute(ctx, STATE_ATTRIBUTE, state);
setAttribute(ctx, LENGTH_ATTRIBUTE, length);
}
}
@Override
public void writeComplete(ChannelHandlerContext ctx, WriteCompletionEvent e) throws Exception {
CounterFilter.messageSent.getAndIncrement();
}
@Override
public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
allChannels.remove(ctx.getChannel());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
e.getCause().printStackTrace();
}
});
}
});
allChannels.add(bootstrap.bind(new InetSocketAddress(port)));
}
/**
* {@inheritedDoc}
*/
public void stop() throws IOException {
allChannels.disconnect().awaitUninterruptibly();
factory.shutdown();
factory.releaseExternalResources();
}
}