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    • com.mastfrog.blurt.UDPMessageLoop Maven / Gradle / Ivy

    /*
 * The MIT License
 *
 * Copyright 2015 Tim Boudreau.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.mastfrog.blurt;

import static com.mastfrog.blurt.BlurtUDP.BLURT_UDP_BROADCAST;
import static com.mastfrog.blurt.BlurtUDP.BLURT_UDP_MULTICAST_LOOPBACK;
import static com.mastfrog.blurt.BlurtUDP.BLURT_UDP_MULTICAST_TTL;
import static com.mastfrog.blurt.BlurtUDP.BLURT_UDP_TRAFFIC_CLASS;
import com.mastfrog.cluster.ApplicationInfo;
import com.mastfrog.settings.Settings;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.ProtocolFamily;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.StandardProtocolFamily;
import java.net.StandardSocketOptions;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.DatagramChannel;
import java.nio.channels.MembershipKey;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.ExecutorService;
import java.util.logging.Level;

/**
 * Inner loop which receives messages
 *
 * @author Tim Boudreau
 */
final class UDPMessageLoop implements Runnable {

    private final InetSocketAddress address;
    private final Queue outbound;
    final BlurtReceiver receiver;
    private final Selector selector;
    private final MembershipKey membershipKey;
    private final SelectionKey receiveKey;
    private final SelectionKey sendKey;
    private final DatagramChannel readChannel;
    private final ExecutorService dispatchThreadPool;
    volatile boolean stopped;
    private final BlurtCodec codec;
    private final int bufferSize;
    private static final int DEFAULT_UDP_BUFFER_SIZE = 1024;
    private final ApplicationInfo info;

    UDPMessageLoop(ApplicationInfo info, final NetworkInterface interf, final InetAddress group, InetSocketAddress addr, final Queue outbound, final BlurtReceiver receiver, final ExecutorService dispatchThreadPool, final int udpPort, ProtocolFamily family, BlurtCodec codec, boolean allowSend, boolean allowReceive, Settings settings) throws ClosedChannelException, SocketException, IOException {
        this.dispatchThreadPool = dispatchThreadPool;
        this.address = addr;
        this.outbound = outbound;
        this.receiver = receiver;
        this.info = info;
        this.codec = codec;
        SocketAddress bindTo = family == StandardProtocolFamily.INET6 ? new InetSocketAddress(udpPort) : addr;
        bufferSize = settings.getInt(Blurt.BLURT_UDP_BUFFER_SIZE, DEFAULT_UDP_BUFFER_SIZE);
        boolean multicastLoopback = settings.getBoolean(BLURT_UDP_MULTICAST_LOOPBACK, true);
        boolean broadcast = settings.getBoolean(BLURT_UDP_BROADCAST, true);
        int ttl = settings.getInt(BLURT_UDP_MULTICAST_TTL, 2);
        int trafficClass = settings.getInt(BLURT_UDP_TRAFFIC_CLASS, 0x04);
        readChannel = DatagramChannel.open(family);
        readChannel.setOption(StandardSocketOptions.SO_REUSEADDR, true).setOption(StandardSocketOptions.IP_MULTICAST_LOOP, multicastLoopback).setOption(StandardSocketOptions.IP_MULTICAST_IF, interf).setOption(StandardSocketOptions.SO_BROADCAST, broadcast).bind(bindTo).setOption(StandardSocketOptions.IP_MULTICAST_TTL, ttl).socket().setTrafficClass(trafficClass);
        readChannel.configureBlocking(false);
        membershipKey = readChannel.join(group, interf);
        selector = Selector.open();
        receiveKey = readChannel.register(selector, SelectionKey.OP_READ | SelectionKey.OP_WRITE, "recv");
        if (allowReceive) {
            receiveKey.interestOps(SelectionKey.OP_READ);
            readChannel.register(selector, SelectionKey.OP_READ);
        }
        DatagramChannel writeChannel = DatagramChannel.open(family).setOption(StandardSocketOptions.SO_REUSEADDR, true).setOption(StandardSocketOptions.IP_MULTICAST_LOOP, multicastLoopback).setOption(StandardSocketOptions.IP_MULTICAST_IF, interf).setOption(StandardSocketOptions.SO_BROADCAST, broadcast).setOption(StandardSocketOptions.IP_MULTICAST_TTL, ttl);
        writeChannel.socket().setTrafficClass(trafficClass);
        writeChannel.configureBlocking(false);
        sendKey = writeChannel.register(selector, SelectionKey.OP_WRITE, "send");
        if (allowSend) {
            sendKey.interestOps(SelectionKey.OP_WRITE);
            writeChannel.register(selector, SelectionKey.OP_WRITE);
        }
    }

    void stop() {
        stopped = true;
        membershipKey.drop();
        receiveKey.cancel();
        sendKey.cancel();
        try {
            selector.close();
        } catch (IOException ex) {
            BlurtUDP.logger.log(Level.SEVERE, null, ex);
        } finally {
            try {
                readChannel.close();
            } catch (IOException ex) {
                BlurtUDP.logger.log(Level.SEVERE, null, ex);
            }
        }
    }

    private class Sender implements Runnable {

        private final Message> payload;

        public Sender(Message> payload) {
            this.payload = payload;
        }

        @Override
        public void run() {
            receiver.receive(payload);
        }
    }

    @Override
    public void run() {
        Thread.currentThread().setName("Blurt UDP Socket Loop");
        byte[] zeros = new byte[bufferSize];
        ByteBuffer buffer = ByteBuffer.allocateDirect(bufferSize);
        buffer.limit(bufferSize);
        buffer.order(ByteOrder.BIG_ENDIAN);
        for (;;) {
            if (stopped) {
                return;
            }
            try {
                selector.select();
                for (Iterator it = selector.selectedKeys().iterator(); it.hasNext();) {
                    if (stopped) {
                        return;
                    }
                    SelectionKey key = it.next();
                    if (key.isReadable()) {
                        DatagramChannel ch = (DatagramChannel) key.channel();
                        buffer.clear();
                        buffer.put(zeros);
                        buffer.clear();
                        SocketAddress a = ch.receive(buffer);
                        int byteCount = buffer.position();
                        BlurtUDP.logger.log(Level.FINEST, "BlurtUDP read {0} bytes", byteCount);
                        if (byteCount > 0) {
                            buffer.flip();
                            try {
                                try {
                                    final Map m = new LinkedHashMap<>(codec.decode(buffer, Map.class));
                                    String id = (String) m.get("i");
                                    if (id != null && info.uniqueIdentifier().equals(id)) {
                                        continue;
                                    }
                                    m.remove("i");
                                    dispatchThreadPool.submit(new Sender(new Message(a, m, id == null ? info.uniqueIdentifier() : id)));
                                } catch (IOException ioe) {
                                    if (ioe.getMessage().contains("no single-String constructor")) {
                                        final Map m = new HashMap<>();
                                        String id = (String) m.get("i");
                                        m.remove("i");
                                        buffer.position(0);
                                        m.put("payload", codec.decode(buffer, String.class));
                                        dispatchThreadPool.submit(new Sender(new Message<>(a, m, id != null ? id : info.uniqueIdentifier())));
                                    }
                                    ioe.printStackTrace();
                                }
                            } catch (IOException e) {
                                e.printStackTrace();
                            } finally {
                                buffer.clear();
                                buffer.put(zeros);
                                buffer.clear();
                            }
                        }
                        //If we don't remove it, we'll keep looping over the same packet
                        it.remove();
                    }
                    if (key.isWritable()) {
                        Object obj = outbound.poll();
                        if (obj != null) {
                            DatagramChannel ch = (DatagramChannel) key.channel();
                            buffer.clear();
                            try {
                                codec.encode(obj, buffer);
                                buffer.flip();
                                int bytes = ch.send(buffer, address);

                                if (bytes == 0) { // Underlying buffer blocked
                                    outbound.offer(obj);
                                }
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                            buffer.clear();
                        }
                        if (!outbound.isEmpty()) {
                            sendKey.interestOps(SelectionKey.OP_WRITE);
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                // select() returns immediately
                // We do want some throttling here
                Thread.sleep(200);
            } catch (Exception ex) {
                if (stopped) {
                    return;
                }
            }
        }
    }

    void touch() {
        sendKey.interestOps(SelectionKey.OP_WRITE);
        selector.wakeup();
    }
}
    
    
    
    

    




    
    
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