udpmessagereceiver.java

来自「Peers is a very minimalistic SIP User-Ag」· Java 代码 · 共 53 行

/*
    This file is part of Peers.

    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 3 of the License, or
    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, see <http://www.gnu.org/licenses/>.
    
    Copyright 2007, 2008 Yohann Martineau 
*/

package net.sourceforge.peers.sip.transport;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

import net.sourceforge.peers.Logger;


public class UdpMessageReceiver extends MessageReceiver {

    private DatagramSocket datagramSocket;
    
    public UdpMessageReceiver(DatagramSocket datagramSocket) throws SocketException {
        super(datagramSocket.getLocalPort());
        this.datagramSocket = datagramSocket;
    }

    @Override
    protected void listen() throws IOException {
        byte[] buf = new byte[BUFFER_SIZE];
        DatagramPacket packet = new DatagramPacket(buf, buf.length);
        datagramSocket.receive(packet);
        byte[] trimmedPacket = new byte[packet.getLength()];
        System.arraycopy(packet.getData(), 0,
                trimmedPacket, 0, trimmedPacket.length);
        Logger.getInstance().traceNetwork(new String(trimmedPacket), "RECEIVED");
        processMessage(trimmedPacket, packet.getAddress());
    }


}