Java tutorial
/* * LumaQQ - Java QQ Client * * Copyright (C) 2004 notXX * luma <stubma@163.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package edu.tsinghua.lumaqq.qq.net; import java.io.IOException; import java.net.InetSocketAddress; import java.net.UnknownHostException; import java.nio.ByteBuffer; import java.nio.channels.DatagramChannel; import java.nio.channels.SelectableChannel; import java.nio.channels.SelectionKey; import java.nio.channels.UnresolvedAddressException; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import edu.tsinghua.lumaqq.qq.QQ; import edu.tsinghua.lumaqq.qq.packets.InPacket; import edu.tsinghua.lumaqq.qq.packets.OutPacket; import edu.tsinghua.lumaqq.qq.packets.PacketParseException; /** * UDP?QQ? * * @author notXX * @author luma */ public class UDPPort extends AbstractPort { /** Log */ private static final Log log = LogFactory.getLog(UDPPort.class); /** ?channel */ protected final DatagramChannel channel; /** * * * @param policy * ? * @param address * ?? * @throws IOException * ? */ public UDPPort(IConnectionPolicy policy, InetSocketAddress address) throws IOException { super(policy); channel = DatagramChannel.open(); channel.configureBlocking(false); this.remoteAddress = address; } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IPort#channel() */ public SelectableChannel channel() { return channel; } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.net.IPort#start() */ public void start() { try { channel.connect(remoteAddress); } catch (UnknownHostException e) { log.error("??"); processError(new Exception("Unknown Host")); } catch (UnresolvedAddressException e) { log.error("???"); processError(new Exception("Unable to resolve server address")); } catch (IOException e) { log.error(""); processError(e); } } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IPort#receive() */ public void receive() throws IOException, PacketParseException { receiveBuf.clear(); for (int len = channel.read(receiveBuf); len > 0; len = channel.read(receiveBuf)) { receiveBuf.flip(); InPacket packet = policy.parseIn(receiveBuf, false); if (packet != null) policy.pushIn(packet); receiveBuf.clear(); } } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IPort#send() */ public void send() throws IOException { while (!isEmpty()) { sendBuf.clear(); OutPacket packet = remove(); packet.fill(sendBuf); sendBuf.flip(); if (packet.needAck()) { channel.write(sendBuf); // ?? packet.setTimeout(System.currentTimeMillis() + QQ.QQ_TIMEOUT_SEND); policy.pushResend(packet, getId()); log.debug("?? - " + packet.toString()); } else { int count = packet.getSendCount(); for (int i = 0; i < count; i++) { sendBuf.rewind(); channel.write(sendBuf); log.debug("?? - " + packet.toString()); } } } } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.net.IPort#send(edu.tsinghua.lumaqq.qq.packets.OutPacket) */ public void send(OutPacket packet) { try { sendBuf.clear(); packet.fill(sendBuf); sendBuf.flip(); if (packet.needAck()) { channel.write(sendBuf); log.debug("?? - " + packet.toString()); } else { int count = packet.getSendCount(); for (int i = 0; i < count; i++) { sendBuf.rewind(); channel.write(sendBuf); log.debug("?? - " + packet.toString()); } } } catch (Exception e) { log.error(e.getMessage()); } } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IPort#send(java.nio.ByteBuffer) */ public void send(ByteBuffer buffer) { try { channel.write(buffer); } catch (IOException e) { log.error(e.getMessage()); } } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.AbstractPort#dispose() */ public void dispose() { try { channel.close(); } catch (IOException e) { } } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IPort#isConnected() */ public boolean isConnected() { return true; } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IHandler#processConnect(java.nio.channels.SelectionKey) */ public void processConnect(SelectionKey sk) throws IOException { // ?? } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IHandler#processRead(java.nio.channels.SelectionKey) */ public void processRead(SelectionKey sk) throws IOException, PacketParseException { receive(); } /* (non-Javadoc) * @see edu.tsinghua.lumaqq.qq.IHandler#processWrite() */ public void processWrite() throws IOException { send(); } }