org.nustaq.fastcast.transport.MulticastChannelPhysicalTransport Maven / Gradle / Ivy

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/*
 * Copyright 2014 Ruediger Moeller.
 *
 * Licensed 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.nustaq.fastcast.transport;

import org.nustaq.fastcast.config.PhysicalTransportConf;
import org.nustaq.fastcast.util.FCLog;

import java.io.*;
import java.net.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;

/**
 * Created with IntelliJ IDEA.
 * User: moelrue
 * Date: 06.06.13
 * Time: 13:45
 *
 * ImMplements
 */
public class MulticastChannelPhysicalTransport implements PhysicalTransport {

    boolean blocking;
    DatagramChannel receiveSocket;
    DatagramChannel sendSocket;
    PhysicalTransportConf conf;
    NetworkInterface iface;
    InetAddress address;
    InetSocketAddress socketAddress;

    public MulticastChannelPhysicalTransport(PhysicalTransportConf conf, boolean blocking) {
        System.setProperty("java.net.preferIPv4Stack","true" );
        this.conf = conf;
        this.blocking = blocking;
    }

    public boolean receive(DatagramPacket pack) throws IOException {
        SocketAddress receive = receiveSocket.receive(ByteBuffer.wrap(pack.getData(), pack.getOffset(), pack.getLength()));
        if ( receive instanceof InetSocketAddress) {
            pack.setAddress(((InetSocketAddress) receive).getAddress());
        }
        return receive != null;
    }

    public boolean receive(ByteBuffer pack) throws IOException {
        SocketAddress receive = receiveSocket.receive(pack);
        return receive != null;
    }

    @Override
    public void send(DatagramPacket pack) throws IOException {
        sendSocket.send(ByteBuffer.wrap(pack.getData(), pack.getOffset(), pack.getLength()), socketAddress);
    }

    @Override
    public void send(byte[] bytes, int off, int len) throws IOException {
        sendSocket.send(ByteBuffer.wrap(bytes, off, len), socketAddress);
    }

    @Override
    public void send(ByteBuffer b) throws IOException {
//        long len = b.remaining();
        sendSocket.send(b, socketAddress);
    }

    public InetSocketAddress getAddress() {
        return socketAddress;
    }

    public NetworkInterface getInterface() {
        return iface;
    }

    public void join() throws IOException {
        if ( address == null ) {
            address = InetAddress.getByName(conf.getMulticastAddr());
        }
        socketAddress = new InetSocketAddress(address,conf.getPort());
        if ( iface == null && conf.getInterfaceAddr() != null) {
            iface =NetworkInterface.getByInetAddress(Inet4Address.getByName(conf.getInterfaceAddr() ));
            if ( iface == null ) {
                iface = NetworkInterface.getByInetAddress( Inet4Address.getByName(conf.getInterfaceAddr() ));
            }
            if ( iface == null ) {
                FCLog.log("Could not find a network interface named '" + conf.getInterfaceAddr() + "'");
            }
        }
        receiveSocket = ceateSocket(blocking);
        sendSocket = ceateSocket(false);

        MembershipKey key = receiveSocket.join(address, iface);
        FCLog.log("Connecting to interface " + iface.getName()+ " on address " + address + " " + conf.getPort()+" dgramsize:"+getConf().getDgramsize());

    }

    private DatagramChannel ceateSocket(boolean block) throws IOException {
        DatagramChannel channel = DatagramChannel.open(StandardProtocolFamily.INET)
                .setOption(StandardSocketOptions.SO_REUSEADDR, true)
                .setOption(StandardSocketOptions.IP_MULTICAST_IF, iface)
                .setOption(StandardSocketOptions.SO_RCVBUF, conf.getSocketReceiveBufferSize())
                .setOption(StandardSocketOptions.IP_TOS, conf.getTrafficClass())
                .setOption(StandardSocketOptions.IP_MULTICAST_LOOP, conf.isLoopBack())
                .setOption(StandardSocketOptions.IP_MULTICAST_TTL, conf.getTtl())
                .bind(new InetSocketAddress(conf.getPort()));
        channel.configureBlocking(block);
        return channel;
    }

    @Override
    public PhysicalTransportConf getConf() {
        return conf;
    }

    @Override
    public void close() {
        try {
            if ( receiveSocket != null )
                receiveSocket.close();
            receiveSocket = null;
        } catch (IOException e) {
            FCLog.get().warn(e);
        }
        try {
            if ( sendSocket != null )
                sendSocket.close();
            sendSocket = null;
        } catch (IOException e) {
            FCLog.get().warn(e);
        }
    }

    @Override
    public boolean isBlocking() {
        return blocking;
    }
}