/*
* 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.bio.udp;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import org.apache.mina.api.IdleStatus;
import org.apache.mina.api.IoHandler;
import org.apache.mina.api.IoService;
import org.apache.mina.api.IoSession;
import org.apache.mina.core.BenchmarkServer;
import org.apache.mina.core.CounterFilter;
import org.apache.mina.core.nio.udp.Mina3UdpBenchmarkServer;
import org.apache.mina.session.AttributeKey;
import org.apache.mina.transport.bio.BioUdpServer;
import org.apache.mina.transport.udp.DefaultUdpSessionConfig;
import org.apache.mina.transport.udp.UdpSessionConfig;
/**
* A Server that uses a BIO datagram to communicate with the server
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*/
public class BioUdpBenchmarkServer 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 ByteBuffer ACK = ByteBuffer.allocate(1);
static {
ACK.put((byte) 0);
ACK.rewind();
}
private static final AttributeKey<State> STATE_ATTRIBUTE = new AttributeKey<State>(State.class,
Mina3UdpBenchmarkServer.class.getName() + ".state");
private static final AttributeKey<Integer> LENGTH_ATTRIBUTE = new AttributeKey<Integer>(Integer.class,
Mina3UdpBenchmarkServer.class.getName() + ".length");
private BioUdpServer udpServer;
/**
* {@inheritDoc}
*/
@Override
public void start(int port) throws IOException {
UdpSessionConfig config = new DefaultUdpSessionConfig();
config.setReadBufferSize(65536);
udpServer = new BioUdpServer(config, null);
udpServer.setIoHandler(new IoHandler() {
@Override
public void sessionOpened(IoSession session) {
session.setAttribute(STATE_ATTRIBUTE, State.WAIT_FOR_FIRST_BYTE_LENGTH);
}
@Override
public void messageReceived(IoSession session, Object message) {
//System.out.println("Server Message received : " + message);
if (message instanceof ByteBuffer) {
ByteBuffer buffer = (ByteBuffer) message;
State state = session.getAttribute(STATE_ATTRIBUTE);
int length = 0;
if (session.getAttribute(LENGTH_ATTRIBUTE) != null) {
length = session.getAttribute(LENGTH_ATTRIBUTE);
}
while (buffer.remaining() > 0) {
switch (state) {
case WAIT_FOR_FIRST_BYTE_LENGTH:
length = (buffer.get() & 255) << 24;
state = State.WAIT_FOR_SECOND_BYTE_LENGTH;
break;
case WAIT_FOR_SECOND_BYTE_LENGTH:
length += (buffer.get() & 255) << 16;
state = State.WAIT_FOR_THIRD_BYTE_LENGTH;
break;
case WAIT_FOR_THIRD_BYTE_LENGTH:
length += (buffer.get() & 255) << 8;
state = State.WAIT_FOR_FOURTH_BYTE_LENGTH;
break;
case WAIT_FOR_FOURTH_BYTE_LENGTH:
length += (buffer.get() & 255);
state = State.READING;
if ((length == 0) && (buffer.remaining() == 0)) {
session.write(ACK.slice());
state = State.WAIT_FOR_FIRST_BYTE_LENGTH;
}
break;
case READING:
int remaining = buffer.remaining();
if (length > remaining) {
length -= remaining;
buffer.position(buffer.position() + remaining);
} else {
buffer.position(buffer.position() + length);
session.write(ACK.slice());
state = State.WAIT_FOR_FIRST_BYTE_LENGTH;
length = 0;
}
}
}
session.setAttribute(LENGTH_ATTRIBUTE, length);
session.setAttribute(STATE_ATTRIBUTE, state);
}
}
@Override
public void exceptionCaught(IoSession session, Exception cause) {
cause.printStackTrace();
}
@Override
public void sessionClosed(IoSession session) {
}
@Override
public void sessionIdle(IoSession session, IdleStatus status) {
}
@Override
public void messageSent(IoSession session, Object message) {
CounterFilter.messageSent.getAndIncrement();
}
@Override
public void serviceActivated(IoService service) {
}
@Override
public void serviceInactivated(IoService service) {
}
});
udpServer.bind(new InetSocketAddress(port));
}
/**
* {@inheritedDoc}
*/
@Override
public void stop() throws IOException {
udpServer.unbind();
}
}